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General Description
The MAX220–MAX249 family of line drivers/receivers is
intended for all EIA/TIA-232E and V.28/V.24 communications interfaces, particularly applications where ±12V is
not available.
These parts are especially useful in battery-powered systems, since their low-power shutdown mode reduces
power dissipation to less than 5µW. The MAX225,
MAX233, MAX235, and MAX245/MAX246/MAX247 use
no external components and are recommended for applications where printed circuit board space is critical.
________________________Applications
Portable Computers
Low-Power Modems
Interface Translation
Battery-Powered RS-232 Systems
Multidrop RS-232 Networks
Next-Generation
Device Features
♦ For Low-Voltage, Integrated ESD Applications
MAX3222E/MAX3232E/MAX3237E/MAX3241E/
MAX3246E: +3.0V to +5.5V, Low-Power, Up to
1Mbps, True RS-232 Transceivers Using Four
0.1µF External Capacitors (MAX3246E Available
in a UCSP™ Package)
♦ For Low-Cost Applications
MAX221E: ±15kV ESD-Protected, +5V, 1µA,
Single RS-232 Transceiver with AutoShutdown™
MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
________________________________________________________________ Maxim Integrated Products 1
Selection Table
19-4323; Rev 15; 1/06
PART
MAX220CPE
MAX220CSE
MAX220CWE 0°C to +70°C
0°C to +70°C
0°C to +70°C
TEMP RANGE PIN-PACKAGE
16 Plastic DIP
16 Narrow SO
16 Wide SO
MAX220C/D 0°C to +70°C Dice*
MAX220EPE
MAX220ESE
MAX220EWE -40°C to +85°C
-40°C to +85°C
-40°C to +85°C 16 Plastic DIP
16 Narrow SO
16 Wide SO
MAX220EJE -40°C to +85°C 16 CERDIP
MAX220MJE -55°C to +125°C 16 CERDIP
Power No. of Nominal SHDN Rx
Part Supply RS-232 No. of Cap. Value & Three- Active in Data Rate
Number (V) Drivers/Rx Ext. Caps (µF) State SHDN (kbps) Features
MAX220 +5 2/2 4 0.047/0.33 No — 120 Ultra-low-power, industry-standard pinout
MAX222 +5 2/2 4 0.1 Yes — 200 Low-power shutdown
MAX223 (MAX213) +5 4/5 4 1.0 (0.1) Yes ✔ 120 MAX241 and receivers active in shutdown
MAX225 +5 5/5 0 — Yes ✔ 120 Available in SO
MAX230 (MAX200) +5 5/0 4 1.0 (0.1) Yes — 120 5 drivers with shutdown
MAX231 (MAX201) +5 and 2/2 2 1.0 (0.1) No — 120 Standard +5/+12V or battery supplies;
+7.5 to +13.2 same functions as MAX232
MAX232 (MAX202) +5 2/2 4 1.0 (0.1) No — 120 (64) Industry standard
MAX232A +5 2/2 4 0.1 No — 200 Higher slew rate, small caps
MAX233 (MAX203) +5 2/2 0 — No — 120 No external caps
MAX233A +5 2/2 0 — No — 200 No external caps, high slew rate
MAX234 (MAX204) +5 4/0 4 1.0 (0.1) No — 120 Replaces 1488
MAX235 (MAX205) +5 5/5 0 — Yes — 120 No external caps
MAX236 (MAX206) +5 4/3 4 1.0 (0.1) Yes — 120 Shutdown, three state
MAX237 (MAX207) +5 5/3 4 1.0 (0.1) No — 120 Complements IBM PC serial port
MAX238 (MAX208) +5 4/4 4 1.0 (0.1) No — 120 Replaces 1488 and 1489
MAX239 (MAX209) +5 and 3/5 2 1.0 (0.1) No — 120 Standard +5/+12V or battery supplies;
+7.5 to +13.2 single-package solution for IBM PC serial port
MAX240 +5 5/5 4 1.0 Yes — 120 DIP or flatpack package
MAX241 (MAX211) +5 4/5 4 1.0 (0.1) Yes — 120 Complete IBM PC serial port
MAX242 +5 2/2 4 0.1 Yes ✔ 200 Separate shutdown and enable
MAX243 +5 2/2 4 0.1 No — 200 Open-line detection simplifies cabling
MAX244 +5 8/10 4 1.0 No — 120 High slew rate
MAX245 +5 8/10 0 — Yes ✔ 120 High slew rate, int. caps, two shutdown modes
MAX246 +5 8/10 0 — Yes ✔ 120 High slew rate, int. caps, three shutdown modes
MAX247 +5 8/9 0 — Yes ✔ 120 High slew rate, int. caps, nine operating modes
MAX248 +5 8/8 4 1.0 Yes ✔ 120 High slew rate, selective half-chip enables
MAX249 +5 6/10 4 1.0 Yes ✔ 120 Available in quad flatpack package
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Ordering Information
Ordering Information continued at end of data sheet.
*Contact factory for dice specifications.
AutoShutdown and UCSP are trademarks of Maxim Integrated
Products, Inc.
MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS—MAX220/222/232A/233A/242/243
ELECTRICAL CHARACTERISTICS—MAX220/222/232A/233A/242/243
(VCC= +5V ±10%, C1–C4 = 0.1µF‚ MAX220, C1 = 0.047µF, C2–C4 = 0.33µF, TA= T
MIN
to T
MAX
‚ unless otherwise noted.)
Note 1: For the MAX220, V+ and V- can have a maximum magnitude of 7V, but their absolute difference cannot exceed 13V.
Note 2: Input voltage measured with T
OUT
in high-impedance state, SHDN or VCC= 0V.
Note 3: Maximum reflow temperature for the MAX233A is +225°C.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Supply Voltage (VCC) ...............................................-0.3V to +6V
V+ (Note 1) ..................................................(V
CC
- 0.3V) to +14V
V- (Note 1) .............................................................+0.3V to +14V
Input Voltages
T
IN
..............................................................-0.3V to (VCC- 0.3V)
R
IN
(Except MAX220) ........................................................±30V
R
IN
(MAX220).....................................................................±25V
T
OUT
(Except MAX220) (Note 2) .......................................±15V
T
OUT
(MAX220)...............................................................±13.2V
Output Voltages
T
OUT
...................................................................................±15V
R
OUT
.........................................................-0.3V to (VCC+ 0.3V)
Driver/Receiver Output Short Circuited to GND.........Continuous
Continuous Power Dissipation (T
A
= +70°C)
16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)..842mW
18-Pin Plastic DIP (derate 11.11mW/°C above +70°C)..889mW
20-Pin Plastic DIP (derate 8.00mW/°C above +70°C) ..440mW
16-Pin Narrow SO (derate 8.70mW/°C above +70°C) ...696mW
16-Pin Wide SO (derate 9.52mW/°C above +70°C)......762mW
18-Pin Wide SO (derate 9.52mW/°C above +70°C)......762mW
20-Pin Wide SO (derate 10.00mW/°C above +70°C)....800mW
20-Pin SSOP (derate 8.00mW/°C above +70°C) ..........640mW
16-Pin CERDIP (derate 10.00mW/°C above +70°C).....800mW
18-Pin CERDIP (derate 10.53mW/°C above +70°C).....842mW
Operating Temperature Ranges
MAX2_ _AC_ _, MAX2_ _C_ _.............................0°C to +70°C
MAX2_ _AE_ _, MAX2_ _E_ _ ..........................-40°C to +85°C
MAX2_ _AM_ _, MAX2_ _M_ _.......................-55°C to +125°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10s) (Note 3) ...................+300°C
RS-232 TRANSMITTERS
Output Voltage Swing All transmitter outputs loaded with 3kΩ to GND ±5 ±8 V
Input Logic Threshold Low 1.4 0.8 V
Input Logic Threshold High
Logic Pullup/lnput Current
Output Leakage Current
Data Rate 200 116 kbps
Transmitter Output Resistance VCC = V+ = V- = 0V, V
Output Short-Circuit Current V
RS-232 RECEIVERS
RS-232 Input Voltage Operating Range
RS-232 Input Threshold Low VCC = 5V
RS-232 Input Threshold High VCC = 5V
PARAMETER CONDITIONS MIN TYP MAX UNITS
All devices except MAX220 2 1.4
MAX220: V
All except MAX220, normal operation 5 40
SHDN = 0V, MAX222/MAX242, shutdown,
MAX220
VCC = 5.5V, SHDN = 0V, V
MAX222/MAX242
V
= SHDN = 0V
CC
= 0V
OUT
= 5.0V 2.4
CC
= ±15V,
OUT
V
= ±15V ±0.01 ±10
OUT
MAX220, V
= ±2V 300 10M Ω
OUT
V
= 0V ±7 ±22
OUT
MAX220 ±60
MAX220 ±25
All except MAX243 R2
MAX243 R2
All except MAX243 R2
MAX243 R2
= ±12V ±25
OUT
(Note 4) -3
IN
(Note 4) -0.5 -0.1
IN
IN
IN
0.8 1.3
±0.01 ±1
±0.01 ±10
±30
1.8 2.4
V
µA
µA
mA
V
V
V
MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
_______________________________________________________________________________________ 3
Note 4: MAX243 R2
OUT
is guaranteed to be low when R2INis ≥ 0V or is floating.
ELECTRICAL CHARACTERISTICS—MAX220/222/232A/233A/242/243 (continued)
(VCC= +5V ±10%, C1–C4 = 0.1µF‚ MAX220, C1 = 0.047µF, C2–C4 = 0.33µF, TA= T
MIN
to T
MAX
‚ unless otherwise noted.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
All except MAX220/MAX243, VCC = 5V, no
RS-232 Input Hysteresis
RS-232 Input Resistance TA = +25°C (MAX220)
TTL/CMOS Output Voltage Low
TTL/CMOS Output Voltage High I
TTL/CMOS Output Short-Circuit Current
TTL/CMOS Output Leakage Current
EN Input Threshold Low MAX242 1.4 0.8 V
EN Input Threshold High MAX242 2.0 1.4 V
Operating Supply Voltage 4.5 5.5 V
VCC Supply Current (SHDN = VCC),
figures 5, 6, 11, 19
Shutdown Supply Current
SHDN Input Leakage Current MAX222/MAX242 ±1 µA
SHDN Threshold Low MAX222/MAX242 1.4 0.8 V
SHDN Threshold High MAX222/MAX242 2.0 1.4 V
Transition Slew Rate
Transmitter Propagation Delay TLL to
RS-232 (Normal Operation), Figure 1
hysteresis in SHDN
MAX220 0.3
MAX243 1
I
= 3.2mA 0.2 0.4
OUT
I
= 1.6mA (MAX220) 0.4
OUT
= -1.0mA 3.5 VCC - 0.2 V
OUT
Sourcing V
Shrinking V
SHDN = V
MAX222), 0V ≤ V
No load
3kΩ load both
inputs
MAX222/
MAX242
= 50pF to
C
L
2500pF, R
to 7kΩ, V
= +25°C,
T
A
measured from
+3V to -3V or -3V
t
PHLT
t
PLHT
= GND -2 -10
OUT
= V
OUT
CC
or EN = VCC (SHDN = 0V for
CC
= 3kΩ
L
CC
= 5V,
≤ V
OUT
CC
MAX220 0.5 2
MAX222/MAX232A/MAX233A/
MAX242/MAX243
MAX220 12
MAX222/MAX232A/MAX233A/
MAX242/MAX243
TA = +25°C 0.1 10
TA = 0°C to +70°C 2 50
TA = -40°C to +85°C 2 50
T
= -55°C to +125°C 35 100
A
MAX222/MAX232A/MAX233/
MAX242/MAX243
MAX220 1.5 3 30.0
MAX222/MAX232A/MAX233/
MAX242/MAX243
MAX220 4 10
MAX222/MAX232A/MAX233/
MAX242/MAX243
MAX220 5 10
0.2 0.5 1.0
35 7
35 7
10 30
61230
±0.05 ±10 µA
410
15
1.3 3.5
1.5 3.5
V
KΩ
V
mA
µA
µA
V/µs
µs
MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
4 _______________________________________________________________________________________
__________________________________________Typical Operating Characteristics
MAX220/MAX222/MAX232A/MAX233A/MAX242/MAX243
10
8
-10
05 15 25
OUTPUT VOLTAGE vs. LOAD CURRENT
-4
-6
-8
-2
6
4
2
MAX220-01
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
10
0
20
0.1µF
EITHER V+ OR V- LOADED
V
CC
= ±5V
NO LOAD ON
TRANSMITTER OUTPUTS
(EXCEPT MAX220, MAX233A)
V- LOADED, NO LOAD ON V+
V+ LOADED, NO LOAD ON V-
1µF
1µF
0.1µF
11
10
4
010 40 60
AVAILABLE OUTPUT CURRENT
vs. DATA RATE
6
5
7
9
8
MAX220-02
DATA RATE (kbits/sec)
OUTPUT CURRENT (mA)
20 30 50
OUTPUT LOAD CURRENT
FLOWS FROM V+ TO V-
VCC = +5.25V
ALL CAPS
1µF
ALL CAPS
0.1µF
VCC = +4.75V
+10V
-10V
MAX222/MAX242
ON-TIME EXITING SHUTDOWN
+5V
+5V
0V
0V
MAX220-03
500µs/div
V+, V- VOLTAGE (V)
1µF CAPS
V+
V+
V-
V-
SHDN
0.1µF CAPS
1µF CAPS
0.1µF CAPS
ELECTRICAL CHARACTERISTICS—MAX220/222/232A/233A/242/243 (continued)
(VCC= +5V ±10%, C1–C4 = 0.1µF‚ MAX220, C1 = 0.047µF, C2–C4 = 0.33µF, TA= T
MIN
to T
MAX
‚ unless otherwise noted.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
MAX222/MAX232A/MAX233/
MAX242/MAX243
MAX220 0.6 3
MAX222/MAX232A/MAX233/
MAX242/MAX243
Receiver Propagation Delay RS-232 to
TLL (Normal Operation), Figure 2
t
PHLR
t
PLHR
MAX220 0.8 3
0.5 1
0.6 1
µs
Receiver Propagation Delay RS-232 to
TLL (Shutdown), Figure 2
Receiver-Output Enable Time, Figure 3 t
Receiver-Output Disable Time, Figure 3 t
Transmitter-Output Enable Time (SHDN
Goes High), Figure 4
Transmitter-Output Disable Time (SHDN
Goes Low), Figure 4
Transmitter + to - Propagation Delay
Difference (Normal Operation)
Receiver + to - Propagation Delay
Difference (Normal Operation)
t
PHLS
t
PHLS
ER
DR
t
ET
t
DT
t
PHLT
t
PHLR
- t
- t
PLHT
PLHR
MAX242 0.5 10
MAX242 2.5 10
MAX242 125 500 ns
MAX242 160 500 ns
MAX222/MAX242, 0.1µF
caps (includes charge-pump
250 µs
start-up)
MAX222/MAX242,
0.1µF caps
MAX222/MAX232A/MAX233/
MAX242/MAX243
600 ns
300
MAX220 2000
MAX222/MAX232A/MAX233/
MAX242/MAX243
100
MAX220 225
µs
ns
ns
MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
_______________________________________________________________________________________ 5
VCC...........................................................................-0.3V to +6V
V+ ................................................................(V
CC
- 0.3V) to +14V
V- ............................................................................+0.3V to -14V
Input Voltages
T
IN
............................................................-0.3V to (VCC+ 0.3V)
R
IN
......................................................................................±30V
Output Voltages
T
OUT
...................................................(V+ + 0.3V) to (V- - 0.3V)
R
OUT
.........................................................-0.3V to (VCC+ 0.3V)
Short-Circuit Duration, T
OUT
......................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
14-Pin Plastic DIP (derate 10.00mW/°C above +70°C)....800mW
16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)....842mW
20-Pin Plastic DIP (derate 11.11mW/°C above +70°C)....889mW
24-Pin Narrow Plastic DIP
(derate 13.33mW/°C above +70°C) ..........1.07W
24-Pin Plastic DIP (derate 9.09mW/°C above +70°C)......500mW
16-Pin Wide SO (derate 9.52mW/°C above +70°C).........762mW
20-Pin Wide SO (derate 10 00mW/°C above +70°C).......800mW
24-Pin Wide SO (derate 11.76mW/°C above +70°C).......941mW
28-Pin Wide SO (derate 12.50mW/°C above +70°C) .............1W
44-Pin Plastic FP (derate 11.11mW/°C above +70°C) .....889mW
14-Pin CERDIP (derate 9.09mW/°C above +70°C) ..........727mW
16-Pin CERDIP (derate 10.00mW/°C above +70°C) ........800mW
20-Pin CERDIP (derate 11.11mW/°C above +70°C) ........889mW
24-Pin Narrow CERDIP
(derate 12.50mW/°C above +70°C) ..............1W
24-Pin Sidebraze (derate 20.0mW/°C above +70°C)..........1.6W
28-Pin SSOP (derate 9.52mW/°C above +70°C).............762mW
Operating Temperature Ranges
MAX2 _ _ C _ _......................................................0°C to +70°C
MAX2 _ _ E _ _ ...................................................-40°C to +85°C
MAX2 _ _ M _ _ ...............................................-55°C to +125°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10s) (Note 4) ...................+300°C
ABSOLUTE MAXIMUM RATINGS—MAX223/MAX230–MAX241
ELECTRICAL CHARACTERISTICS—MAX223/MAX230–MAX241
(MAX223/230/232/234/236/237/238/240/241, VCC= +5V ±10; MAX233/MAX235, VCC= 5V ±5%‚ C1–C4 = 1.0µF; MAX231/MAX239,
V
CC
= 5V ±10%; V+ = 7.5V to 13.2V; TA= T
MIN
to T
MAX
; unless otherwise noted.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
CONDITIONS
MIN TYP MAX
UNITS
Output Voltage Swing All transmitter outputs loaded with 3kΩ to ground ±5.0 ±7.3 V
VCCPower-Supply Current
No load,
T
A
= +25°C
510
mA
715
0.4 1
V+ Power-Supply Current
1.8 5
mA
515
Shutdown Supply Current TA= +25°C
15 50
VInput Logic Threshold High
T
IN
2.0
EN, SHDN (MAX223);
EN, SHDN (MAX230/235/236/240/241)
2.4
Logic Pull-Up Current T
IN
=0V 1.5 200
Receiver Input Voltage
Operating Range
-30 +30 V
µA
µA
110
VInput Logic Threshold Low
TIN; EN, SHDN (MAX233); EN, SHDN (MAX230/235–241)
0.8
MAX231/239
MAX223/230/234–238/240/241
MAX232/233
PARAMETER
MAX239
MAX230/235/236/240/241
MAX231
MAX223
Note 4: Maximum reflow temperature for the MAX233/MAX235 is +225°C.
mA
MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
6 _______________________________________________________________________________________
V
0.8 1.2
PARAMETER MIN TYP MAX UNITSCONDITIONS
Normal operation
SHDN = 5V (MAX223)
SHDN = 0V (MAX235/236/240/241)
1.7 2.4
RS-232 Input Threshold Low
TA= +25°C,
V
CC
= 5V
0.6 1.5
VRS-232 Input Threshold High
TA= +25°C,
VCC= 5V
Shutdown (MAX223)
SHDN = 0V,
EN = 5V (R4
IN
‚ R5IN)
1.5 2.4
ELECTRICAL CHARACTERISTICS—MAX223/MAX230–MAX241 (continued)
(MAX223/230/232/234/236/237/238/240/241, VCC= +5V ±10; MAX233/MAX235, VCC= 5V ±5%‚ C1–C4 = 1.0µF; MAX231/MAX239,
V
CC
= 5V ±10%; V+ = 7.5V to 13.2V; TA= T
MIN
to T
MAX
; unless otherwise noted.)
Shutdown (MAX223)
SHDN = 0V,
EN = 5V (R4
IN
, R5IN)
Normal operation
SHDN = 5V (MAX223)
SHDN = 0V (MAX235/236/240/241)
RS-232 Input Hysteresis VCC= 5V, no hysteresis in shutdown 0.2 0.5 1.0 V
RS-232 Input Resistance TA= +25°C, VCC= 5V 357kΩ
TTL/CMOS Output Voltage Low I
OUT
= 1.6mA (MAX231/232/233, I
OUT
= 3.2mA) 0.4 V
TTL/CMOS Output Voltage High I
OUT
= -1mA 3.5 VCC- 0.4 V
TTL/CMOS Output Leakage Current
0V ≤ R
OUT
≤ VCC; EN = 0V (MAX223);
EN = V
CC
(MAX235–241 )
0.05 ±10 µA
MAX223 600
nsReceiver Output Enable Time
Normal
operation
MAX235/236/239/240/241 400
MAX223 900
nsReceiver Output Disable Time
Normal
operation
MAX235/236/239/240/241 250
Normal operation 0.5 10
µs
SHDN = 0V
(MAX223)
440
Propagation Delay
RS-232 IN to
TTL/CMOS OUT,
CL= 150pF
640
3 5.1 30
V/µs
MAX231/MAX232/MAX233, TA= +25°C, VCC= 5V,
R
L
= 3kΩ to 7kΩ, CL= 50pF to 2500pF, measured from
+3V to -3V or -3V to +3V
430
Transmitter Output Resistance VCC= V+ = V- = 0V, V
OUT
= ±2V 300 Ω
Transmitter Output Short-Circuit
Current
±10 mA
t
PHLS
t
PLHS
Transition Region Slew Rate
MAX223/MAX230/MAX234–241, TA= +25°C, VCC= 5V,
R
L
= 3kΩ to 7kΩ‚ CL= 50pF to 2500pF, measured from
+3V to -3V or -3V to +3V
MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
_______________________________________________________________________________________ 7
__________________________________________Typical Operating Characteristics
MAX223/MAX230–MAX241
*SHUTDOWN POLARITY IS REVERSED
FOR NON MAX241 PARTS
V+, V- WHEN EXITING SHUTDOWN
(1µF CAPACITORS)
MAX220-13
SHDN*
V-
O
V+
500ms/div
TRANSMITTER OUTPUT
8.5
VOLTAGE (V
8.0
1 TRANSMITTER
(V)
V
OH
LOADED
7.5
7.0
4 TRANSMITTERS
6.5
4.5 5.5
LOADED
) vs. V
OH
2 TRANSMITTERS
LOADED
5.0
VCC (V)
TRANSMITTER OUTPUT
VOLTAGE (V
-6.0
-6.5
-7.0
(V)
-7.5
OL
V
1 TRANSMITTER
-8.0
LOADED
2 TRANS-
-8.5
MITTERS
LOADED
-9.0
4.5 5.5
OL
4 TRANSMITTERS
LOADED
3 TRANSMITTERS
LOADED
5.0
VCC (V)
) vs. V
CC
3 TRANSMITTERS
LOADED
TA = +25°C
C1–C4 = 1µF
TRANSMITTER
LOADS =
3kΩ || 2500pF
CC
TA = +25°C
C1–C4 = 1µF
TRANSMITTER
LOADS =
3kΩ || 2500pF
MAX220-04
MAX220-07
TRANSMITTER OUTPUT VOLTAGE (VOH)
vs. LOAD CAPACITANCE AT
DIFFERENT DATA RATES
MAX220-05
12.0
11.0
10.0
9.0
8.0
7.0
SLEW RATE (V/µs)
6.0
5.0
4.0
7.4
7.2
7.0
6.8
(V)
V
OH
160kbits/sec
80kbits/sec
6.6
20kbits/sec
TA = +25°C
6.4
6.2
6.0
= +5V
V
CC
3 TRANSMITTERS LOADED
Ω
= 3k
R
L
C1–C4 = 1µF
0 2500
LOAD CAPACITANCE (pF)
15001000500 2000
TRANSMITTER OUTPUT VOLTAGE (VOL)
vs. LOAD CAPACITANCE AT
DIFFERENT DATA RATES
MAX220-08
10
8
6
4
2
0
V+, V- (V)
-2
-4
-6
-8
-10
-6.0
TA = +25°C
(V)
V
-6.2
-6.4
-6.6
-6.8
OL
-7.0
-7.2
-7.4
-7.6
= +5V
V
CC
3 TRANSMITTERS LOADED
Ω
= 3k
R
L
C1–C4 = 1µF
160kbits/sec
80kbits/sec
20Kkbits/sec
02500
LOAD CAPACITANCE (pF)
15001000500 2000
TRANSMITTER SLEW RATE
vs. LOAD CAPACITANCE
1 TRANSMITTER LOADED
3 TRANSMITTERS
LOADED
0 2500
4 TRANSMITTERS
LOADED
LOAD CAPACITANCE (pF)
TA = +25°C
= +5V
V
CC
LOADED, R
C1–C4 = 1µF
2 TRANSMITTERS
LOADED
15001000500 2000
L
= 3k
Ω
TRANSMITTER OUTPUT VOLTAGE (V+, V-)
vs. LOAD CURRENT
TA = +25°C
= +5V
V
CC
C1–C4 = 1µF
V+ AND VEQUALLY
LOADED
0 5 10 15 20 25 30 35 40 45 50
V- LOADED,
NO LOAD
ON V+
ALL TRANSMITTERS UNLOADED
CURRENT (mA)
V+ LOADED,
NO LOAD
ON V-
MAX220-06
MAX220-09
Input Logic Threshold Low
MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
8 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS—MAX225/MAX244–MAX249
ELECTRICAL CHARACTERISTICS—MAX225/MAX244–MAX249
(MAX225, VCC= 5.0V ±5%; MAX244–MAX249, VCC= +5.0V ±10%, external capacitors C1–C4 = 1µF; TA= T
MIN
to T
MAX
; unless oth-
erwise noted.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Supply Voltage (VCC) ...............................................-0.3V to +6V
Input Voltages
T
IN
‚ ENA, ENB, ENR, ENT, ENRA,
ENRB, ENTA, ENTB..................................-0.3V to (V
CC
+ 0.3V)
R
IN
.....................................................................................±25V
T
OUT
(Note 5).....................................................................±15V
R
OUT
........................................................-0.3V to (VCC+ 0.3V)
Short Circuit (one output at a time)
T
OUT
to GND ............................................................Continuous
R
OUT
to GND............................................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
28-Pin Wide SO (derate 12.50mW/°C above +70°C) .............1W
40-Pin Plastic DIP (derate 11.11mW/°C above +70°C) ...611mW
44-Pin PLCC (derate 13.33mW/°C above +70°C) ...........1.07W
Operating Temperature Ranges
MAX225C_ _, MAX24_C_ _ ..................................0°C to +70°C
MAX225E_ _, MAX24_E_ _ ...............................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering,10s) (Note 6) ....................+300°C
VCC= 0V,
V
OUT
= ±15V
µATables 1a–1d
±0.01 ±25
Normal operation
Shutdown
Tables 1a–1d, normal operation
All transmitter outputs loaded with 3kΩ to GND
ENA, ENB, ENT, ENTA, ENTB =
V
CC,VOUT
= ±15V
VRS-232 Input Hysteresis
RS-232 Input Threshold Low V
V±5 ±7.5Output Voltage Swing
Output Leakage Current (Shutdown)
±0.01 ±25
Ω300 10MVCC= V+ = V- = 0V, V
OUT
= ±2V (Note 7)Transmitter Output Resistance
µA
PARAMETER
±0.05 ±0.10
MIN TYP MAX UNITS
Normal operation, outputs disabled,
Tables 1a–1d, 0V ≤ V
OUT
≤ VCC, ENR_ = V
CC
TTL/CMOS Output Leakage Current
10 30Shrinking V
OUT
= V
CC
mA
-2 -10Sourcing V
OUT
= GND
V3.5 VCC- 0.2I
OUT
= -1.0mATTL/CMOS Output Voltage High
V0.2 0.4I
OUT
= 3.2mATTL/CMOS Output Voltage Low
kΩ357
0.2 0.5 1.0VCC= 5V
1.4 0.8 V
TTL/CMOS Output Short-Circuit Current
V1.8 2.4
0.8 1.3VCC= 5V
RS-232 Input Resistance
V±25RS-232 Input Voltage Operating Range
mA±7 ±30V
OUT
= 0VOutput Short-Circuit Current
kbps120 64Data Rate
CONDITIONS
VCC= 5V
µA
±0.01 ±1
Logic Pull-Up/lnput Current
10 50
Tables 1a–1d
RS-232 Input Threshold High
V2 1.4Input Logic Threshold High
RS-232 TRANSMITTERS
RS-232 RECEIVERS
Note 5: Input voltage measured with transmitter output in a high-impedance state, shutdown, or VCC= 0V.
Note 6: Maximum reflow temperature for the MAX225/MAX245/MAX246/MAX247 is +225°C.
MAX220–MAX249
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Drivers/Receivers
_______________________________________________________________________________________ 9
Operating Supply Voltage
4.75 5.25
V
Transmitter Enable Time
MAX225 10 20
t
ET
No load
MAX244–MAX249 11 30
51030
MAX225 40
VCCSupply Current
(Normal Operation)
3kΩ loads on
all outputs
MAX244–MAX249 57
mA
Transition Slew Rate
825
CL= 50pF to 2500pF, RL= 3kΩ to 7kΩ, VCC= 5V,
TA= +25°C, measured from +3V to -3V or -3V to +3V
TA= T
MIN
to T
MAX
CONDITIONS
50
V/µs
MAX246–MAX249
(excludes charge-pump startup)
Shutdown Supply Current µA
5
t
PHLT
1.3 3.5
µs
t
PLHT
1.5 3.5
Transmitter Disable Time, Figure 4
Transmitter Propagation Delay
TLL to RS-232 (Normal Operation),
Figure 1
µs
t
DT
100 ns
Transmitter + to - Propagation
Delay Difference (Normal Operation)
t
PHLT
- t
PLHT
UNITSMIN TYP MAX
350
PARAMETER
ns
Receiver + to - Propagation
Delay Difference (Normal Operation)
t
PHLR
- t
PLHR
350 ns
4.5 5.5MAX244–MAX249
MAX225
Leakage current ±1
Threshold low 1.4 0.8
Control Input
Threshold high 2.4 1.4
V
µA
TA= +25°C
t
PHLR
0.6 1.5
t
PLHR
0.6 1.5
Receiver Propagation Delay
TLL to RS-232 (Normal Operation),
Figure 2
µs
t
PHLS
0.6 10
t
PLHS
3.0 10
Receiver Propagation Delay
TLL to RS-232 (Low-Power Mode),
Figure 2
µs
Receiver-Output Enable Time, Figure 3 t
ER
100 500 ns
Receiver-Output Disable Time, Figure 3 t
DR
100 500 ns
MAX225/MAX245–MAX249
(includes charge-pump startup)
10 ms
POWER SUPPLY AND CONTROL LOGIC
AC CHARACTERISTICS
Note 7: The 300Ω minimum specification complies with EIA/TIA-232E, but the actual resistance when in shutdown mode or VCC=
0V is 10MΩ as is implied by the leakage specification.
ELECTRICAL CHARACTERISTICS—MAX225/MAX244–MAX249 (continued)
(MAX225, VCC= 5.0V ±5%; MAX244–MAX249, VCC= +5.0V ±10%, external capacitors C1–C4 = 1µF; TA= T
MIN
to T
MAX
; unless oth-
erwise noted.)
MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
10 ______________________________________________________________________________________
__________________________________________Typical Operating Characteristics
MAX225/MAX244–MAX249
18
2
012345
TRANSMITTER SLEW RATE
vs. LOAD CAPACITANCE
8
6
4
16
MAX220-10
LOAD CAPACITANCE (nF)
TRANSMITTER SLEW RATE (V/µs)
14
12
10
V
CC
= 5V
EXTERNAL POWER SUPPLY
1µF CAPACITORS
40kb/s DATA RATE
8 TRANSMITTERS
LOADED WITH 3k
Ω
10
-10
0 5 10 15 20 25 30 35
OUTPUT VOLTAGE
vs. LOAD CURRENT FOR V+ AND V-
-2
-4
-6
-8
8
MAX220-11
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
6
4
2
0
V+ AND V- LOADED
EITHER V+ OR
V- LOADED
V+ AND V- LOADED
VCC = 5V
EXTERNAL CHARGE PUMP
1µF CAPACITORS
8 TRANSMITTERS
DRIVING 5kΩ AND
2000pF AT 20kbits/sec
V- LOADED
V+ LOADED
9.0
5.0
01
2
345
TRANSMITTER OUTPUT VOLTAGE (V+, V-)
vs. LOAD CAPACITANCE AT
DIFFERENT DATA RATES
6.0
5.5
8.5
MAX220-12
LOAD CAPACITANCE (nF)
V+, V (V)
8.0
7.5
7.0
6.5
VCC = 5V WITH ALL TRANSMITTERS DRIVEN
LOADED WITH 5k
Ω
10kb/sec
20kb/sec
40kb/sec
60kb/sec
100kb/sec
200kb/sec
ALL CAPACITIORS 1µF
MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
______________________________________________________________________________________ 11
+3V
Figure 1. Transmitter Propagation-Delay Timing
Figure 2. Receiver Propagation-Delay Timing
Figure 3. Receiver-Output Enable and Disable Timing
Figure 4. Transmitter-Output Disable Timing
INPUT
OUTPUT
t
PLHT
+3V
0V*
INPUT
0V
OUTPUT
V+
0V
t
PHLT
V-
t
PHLR
t
PHLS
*EXCEPT FOR R2 ON THE MAX243
WHERE -3V IS USED.
50%
50%
50%
50%
GND
t
PLHR
t
PLHS
V
CC
EN
R
IN
X
a) TEST CIRCUIT
EN INPUT
RECEIVER
OUTPUTS
b) ENABLE TIMING
EN INPUT
V
OH
RECEIVER
OUTPUTS
V
OL
c) DISABLE TIMING
+3V
0V
R
X
1kΩ
OUT
R
X
150pF
0V
OUTPUT ENABLE TIME (t
+3.5V
+0.8V
+3V
OUTPUT DISABLE TIME (t
VOH - 0.5V
V
+ 0.5V
OL
- 2V
V
CC
EN
)
ER
EN
)
DR
- 2V
V
CC
SHDN
a) TIMING DIAGRAM
1 OR 0
b) TEST CIRCUIT
+3V
0V
OUTPUT DISABLE TIME (t
V+
V-
T
X
3kΩ
+5V
-5V
50pF
)
DT
0V
MAX220–MAX249
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Drivers/Receivers
12 ______________________________________________________________________________________
ENT ENR
OPERATION STATUS TRANSMITTERS RECEIVERS
0 0 Normal Operation All Active All Active
0 1 Normal Operation All Active All 3-State
1 0 Shutdown All 3-State All Low-Power Receive Mode
1 1 Shutdown All 3-State All 3-State
Table 1a. MAX245 Control Pin Configurations
ENT ENR
OPERATION
STATUS
TRANSMITTERS RECEIVERS
TA1–TA4 TB1–TB4 RA1–RA5 RB1–RB5
0 0 Normal Operation All Active All Active All Active All Active
0 1 Normal Operation All Active All Active
RA1–RA4 3-State,
RA5 Active
RB1–RB4 3-State,
RB5 Active
1 0 Shutdown All 3-State All 3-State
All Low-Power
Receive Mode
All Low-Power
Receive Mode
1 1 Shutdown All 3-State All 3-State
RA1–RA4 3-State,
RA5 Low-Power
Receive Mode
RB1–RB4 3-State,
RB5 Low-Power
Receive Mode
Table 1b. MAX245 Control Pin Configurations
Table 1c. MAX246 Control Pin Configurations
ENA ENB
OPERATION
STATUS
TRANSMITTERS RECEIVERS
TA1–TA4 TB1–TB4 RA1–RA5 RB1–RB5
0 0 Normal Operation All Active All Active All Active All Active
0 1 Normal Operation All Active All 3-State All Active
RB1–RB4 3-State,
RB5 Active
1 0 Shutdown All 3-State All Active
RA1–RA4 3-State,
RA5 Active
All Active
1 1 Shutdown All 3-State All 3-State
RA1–RA4 3-State,
RA5 Low-Power
Receive Mode
RB1–RB4 3-State,
RA5 Low-Power
Receive Mode
MAX220–MAX249
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Drivers/Receivers
______________________________________________________________________________________ 13
TA1–TA4 TB1–TB4 RA1–RA4 RB1–RB4
0 0 0 0 Normal Operation All Active All Active All Active All Active
0 0 0 1 Normal Operation All Active All Active All Active
All 3-State, except
RB5 stays active on
MAX247
0 0 1 0 Normal Operation All Active All Active All 3-State All Active
0 0 1 1 Normal Operation All Active All Active All 3-State
All 3-State, except
RB5 stays active on
MAX247
0 1 0 0 Normal Operation All Active All 3-State All Active All Active
0 1 0 1 Normal Operation All Active All 3-State All Active
All 3-State, except
RB5 stays active on
MAX247
0 1 1 0 Normal Operation All Active All 3-State All 3-State All Active
0 1 1 1 Normal Operation All Active All 3-State All 3-State
All 3-State, except
RB5 stays active on
MAX247
1 0 0 0 Normal Operation All 3-State All Active All Active All Active
1 0 0 1 Normal Operation All 3-State All Active All Active
All 3-State, except
RB5 stays active on
MAX247
1 0 1 0 Normal Operation All 3-State All Active All 3-State All Active
1 0 1 1 Normal Operation All 3-State All Active All 3-State
All 3-State, except
RB5 stays active on
MAX247
1 1 0 0 Shutdown All 3-State All 3-State
Low-Power
Receive Mode
Low-Power
Receive Mode
1 1 0 1 Shutdown All 3-State All 3-State
Low-Power
Receive Mode
All 3-State, except
RB5 stays active on
MAX247
1 1 1 0 Shutdown All 3-State All 3-State All 3-State
Low-Power
Receive Mode
1 1 1 1 Shutdown All 3-State All 3-State All 3-State
All 3-State, except
RB5 stays active on
MAX247
Table 1d. MAX247/MAX248/MAX249 Control Pin Configurations
MAX248
OPERATION
STATUS
ENRB
MAX247 TA1–TA4 TB1–TB4 RA1–RA4 RB1–RB5
TRANSMITTERS
ENRAENTBENTA
MAX249 TA1–TA3 TB1–TB3 RA1–RA5 RB1–RB5
RECEIVERS
MAX220–MAX249
_______________Detailed Description
The MAX220–MAX249 contain four sections: dual
charge-pump DC-DC voltage converters, RS-232 drivers, RS-232 receivers, and receiver and transmitter
enable control inputs.
Dual Charge-Pump Voltage Converter
The MAX220–MAX249 have two internal charge-pumps
that convert +5V to ±10V (unloaded) for RS-232 driver
operation. The first converter uses capacitor C1 to double the +5V input to +10V on C3 at the V+ output. The
second converter uses capacitor C2 to invert +10V to
-10V on C4 at the V- output.
A small amount of power may be drawn from the +10V
(V+) and -10V (V-) outputs to power external circuitry
(see the Typical Operating Characteristics section),
except on the MAX225 and MAX245–MAX247, where
these pins are not available. V+ and V- are not regulated,
so the output voltage drops with increasing load current.
Do not load V+ and V- to a point that violates the minimum ±5V EIA/TIA-232E driver output voltage when
sourcing current from V+ and V- to external circuitry.
When using the shutdown feature in the MAX222,
MAX225, MAX230, MAX235, MAX236, MAX240,
MAX241, and MAX245–MAX249, avoid using V+ and Vto power external circuitry. When these parts are shut
down, V- falls to 0V, and V+ falls to +5V. For applications where a +10V external supply is applied to the V+
pin (instead of using the internal charge pump to generate +10V), the C1 capacitor must not be installed and
the SHDN pin must be tied to VCC. This is because V+
is internally connected to VCCin shutdown mode.
RS-232 Drivers
The typical driver output voltage swing is ±8V when
loaded with a nominal 5kΩ RS-232 receiver and VCC=
+5V. Output swing is guaranteed to meet the EIA/TIA232E and V.28 specification, which calls for ±5V minimum driver output levels under worst-case conditions.
These include a minimum 3kΩ load, VCC= +4.5V, and
maximum operating temperature. Unloaded driver output voltage ranges from (V+ -1.3V) to (V- +0.5V).
Input thresholds are both TTL and CMOS compatible.
The inputs of unused drivers can be left unconnected
since 400kΩ input pull-up resistors to VCCare built in
(except for the MAX220). The pull-up resistors force the
outputs of unused drivers low because all drivers invert.
The internal input pull-up resistors typically source 12µA,
except in shutdown mode where the pull-ups are disabled. Driver outputs turn off and enter a high-impedance state—where leakage current is typically
microamperes (maximum 25µA)—when in shutdown
mode, in three-state mode, or when device power is
removed. Outputs can be driven to ±15V. The powersupply current typically drops to 8µA in shutdown mode.
The MAX220 does not have pull-up resistors to force the
outputs of the unused drivers low. Connect unused
inputs to GND or VCC.
The MAX239 has a receiver three-state control line, and
the MAX223, MAX225, MAX235, MAX236, MAX240,
and MAX241 have both a receiver three-state control
line and a low-power shutdown control. Table 2 shows
the effects of the shutdown control and receiver threestate control on the receiver outputs.
The receiver TTL/CMOS outputs are in a high-impedance, three-state mode whenever the three-state enable
line is high (for the MAX225/MAX235/MAX236/MAX239–
MAX241), and are also high-impedance whenever the
shutdown control line is high.
When in low-power shutdown mode, the driver outputs
are turned off and their leakage current is less than 1µA
with the driver output pulled to ground. The driver output
leakage remains less than 1µA, even if the transmitter
output is backdriven between 0V and (VCC+ 6V). Below
-0.5V, the transmitter is diode clamped to ground with
1kΩ series impedance. The transmitter is also zener
clamped to approximately VCC+ 6V, with a series
impedance of 1kΩ.
The driver output slew rate is limited to less than 30V/µs
as required by the EIA/TIA-232E and V.28 specifications. Typical slew rates are 24V/µs unloaded and
10V/µs loaded with 3Ω and 2500pF.
RS-232 Receivers
EIA/TIA-232E and V.28 specifications define a voltage
level greater than 3V as a logic 0, so all receivers invert.
Input thresholds are set at 0.8V and 2.4V, so receivers
respond to TTL level inputs as well as EIA/TIA-232E and
V.28 levels.
The receiver inputs withstand an input overvoltage up
to ±25V and provide input terminating resistors with
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Drivers/Receivers
14 ______________________________________________________________________________________
PART
SHDN
EN
EN(R)
RECEIVERS
MAX223 __
Low
High
High
X
Low
High
High Impedance
Active
High Impedance
MAX225 __ __
High Impedance
Active
__
MAX235
MAX236
MAX240
Low
Low
High
__ __
Low
High
X
High Impedance
Active
High Impedance
Table 2. Three-State Control of Receivers
Low
High
SHDN
__
MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
______________________________________________________________________________________ 15
nominal 5kΩ values. The receivers implement Type 1
interpretation of the fault conditions of V.28 and
EIA/TIA-232E.
The receiver input hysteresis is typically 0.5V with a
guaranteed minimum of 0.2V. This produces clear output transitions with slow-moving input signals, even
with moderate amounts of noise and ringing. The
receiver propagation delay is typically 600ns and is
independent of input swing direction.
Low-Power Receive Mode
The low-power receive-mode feature of the MAX223,
MAX242, and MAX245–MAX249 puts the IC into shutdown mode but still allows it to receive information. This
is important for applications where systems are periodically awakened to look for activity. Using low-power
receive mode, the system can still receive a signal that
will activate it on command and prepare it for communication at faster data rates. This operation conserves
system power.
Negative Threshold—MAX243
The MAX243 is pin compatible with the MAX232A, differing only in that RS-232 cable fault protection is removed
on one of the two receiver inputs. This means that control
lines such as CTS and RTS can either be driven or left
floating without interrupting communication. Different
cables are not needed to interface with different pieces of
equipment.
The input threshold of the receiver without cable fault
protection is -0.8V rather than +1.4V. Its output goes
positive only if the input is connected to a control line
that is actively driven negative. If not driven, it defaults
to the 0 or “OK to send” state. Normally‚ the MAX243’s
other receiver (+1.4V threshold) is used for the data line
(TD or RD)‚ while the negative threshold receiver is connected to the control line (DTR‚ DTS‚ CTS‚ RTS, etc.).
Other members of the RS-232 family implement the
optional cable fault protection as specified by EIA/TIA232E specifications. This means a receiver output goes
high whenever its input is driven negative‚ left floating‚
or shorted to ground. The high output tells the serial
communications IC to stop sending data. To avoid this‚
the control lines must either be driven or connected
with jumpers to an appropriate positive voltage level.
Shutdown—MAX222–MAX242
On the MAX222‚ MAX235‚ MAX236‚ MAX240‚ and
MAX241‚ all receivers are disabled during shutdown.
On the MAX223 and MAX242‚ two receivers continue to
operate in a reduced power mode when the chip is in
shutdown. Under these conditions‚ the propagation
delay increases to about 2.5µs for a high-to-low input
transition. When in shutdown, the receiver acts as a
CMOS inverter with no hysteresis. The MAX223 and
MAX242 also have a receiver output enable input (EN
for the MAX242 and EN for the MAX223) that allows
receiver output control independent of SHDN (SHDN
for MAX241). With all other devices‚ SHDN (SHDN for
MAX241) also disables the receiver outputs.
The MAX225 provides five transmitters and five
receivers‚ while the MAX245 provides ten receivers and
eight transmitters. Both devices have separate receiver
and transmitter-enable controls. The charge pumps
turn off and the devices shut down when a logic high is
applied to the ENT input. In this state, the supply current drops to less than 25µA and the receivers continue
to operate in a low-power receive mode. Driver outputs
enter a high-impedance state (three-state mode). On
the MAX225‚ all five receivers are controlled by the
ENR input. On the MAX245‚ eight of the receiver outputs are controlled by the ENR input‚ while the remaining two receivers (RA5 and RB5) are always active.
RA1–RA4 and RB1–RB4 are put in a three-state mode
when ENR is a logic high.
Receiver and Transmitter Enable
Control Inputs
The MAX225 and MAX245–MAX249 feature transmitter
and receiver enable controls.
The receivers have three modes of operation: full-speed
receive (normal active)‚ three-state (disabled)‚ and lowpower receive (enabled receivers continue to function
at lower data rates). The receiver enable inputs control
the full-speed receive and three-state modes. The
transmitters have two modes of operation: full-speed
transmit (normal active) and three-state (disabled). The
transmitter enable inputs also control the shutdown
mode. The device enters shutdown mode when all
transmitters are disabled. Enabled receivers function in
the low-power receive mode when in shutdown.
MAX220–MAX249
Tables 1a–1d define the control states. The MAX244
has no control pins and is not included in these tables.
The MAX246 has ten receivers and eight drivers with
two control pins, each controlling one side of the
device. A logic high at the A-side control input (ENA)
causes the four A-side receivers and drivers to go into
a three-state mode. Similarly, the B-side control input
(ENB) causes the four B-side drivers and receivers to
go into a three-state mode. As in the MAX245, one Aside and one B-side receiver (RA5 and RB5) remain
active at all times. The entire device is put into shutdown mode when both the A and B sides are disabled
(ENA = ENB = +5V).
The MAX247 provides nine receivers and eight drivers
with four control pins. The ENRA and ENRB receiver
enable inputs each control four receiver outputs. The
ENTA and ENTB transmitter enable inputs each control
four drivers. The ninth receiver (RB5) is always active.
The device enters shutdown mode with a logic high on
both ENTA and ENTB.
The MAX248 provides eight receivers and eight drivers
with four control pins. The ENRA and ENRB receiver
enable inputs each control four receiver outputs. The
ENTA and ENTB transmitter enable inputs control four
drivers each. This part does not have an always-active
receiver. The device enters shutdown mode and transmitters go into a three-state mode with a logic high on
both ENTA and ENTB.
The MAX249 provides ten receivers and six drivers with
four control pins. The ENRA and ENRB receiver enable
inputs each control five receiver outputs. The ENTA
and ENTB transmitter enable inputs control three drivers each. There is no always-active receiver. The
device enters shutdown mode and transmitters go into
a three-state mode with a logic high on both ENTA and
ENTB. In shutdown mode, active receivers operate in a
low-power receive mode at data rates up to 20kb/s.
__________Applications Information
Figures 5 through 25 show pin configurations and typical operating circuits. In applications that are sensitive
to power-supply noise, VCCshould be decoupled to
ground with a capacitor of the same value as C1 and
C2 connected as close as possible to the device.
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Drivers/Receivers
16 ______________________________________________________________________________________
MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
______________________________________________________________________________________ 17
TOP VIEW
Figure 5. MAX220/MAX232/MAX232A Pin Configuration and Typical Operating Circuit
Figure 6. MAX222/MAX242 Pin Configurations and Typical Operating Circuit
+5V INPUT
C5
C1+
1
V+
2
C1-
3
C2+
C2-
V-
T2
OUT
R2
IN
MAX220
4
MAX232
5
MAX232A
6
7
8
V
CC
16
GND
15
T1
OUT
14
R1
13
IN
R1
12
OUT
T1
11
IN
T2
10
IN
R2
9
OUT
TTL/CMOS
INPUTS
1
C1+
C1
3
C1-
4
C2+
C2
5
C2-
400k
T1
11
T2
10
V
+5V TO +10V
VOLTAGE DOUBLER
+10V TO -10V
VOLTAGE INVERTER
+5V
Ω
IN
+5V
Ω
400k
IN
CC
C3
16
2
+10V
V+
6
-10V
V-
C4
T1
14
OUT
RS-232
OUTPUTS
7
T2
OUT
DIP/SO
TTL/CMOS
OUTPUTS
DEVICE
MAX220
MAX232
MAX232A
CAPACITANCE (µF)
C1
C2
0.33
1.0
0.1
C3
0.33
1.0
0.1
0.047
1.0
0.1
C4
0.33
1.0
0.1
C5
0.33
1.0
0.1
TOP VIEW
TTL/CMOS
INPUTS
TTL/CMOS
OUTPUTS
C1
C2
(N.C.) EN
1
(N.C.) EN
C1+
C1-
C2+
C2-
T2
OUT
R2
1
2
V+
3
4
MAX222
5
MAX242
6
V-
7
8
IN
9
SHDN
18
V
17
CC
GND
16
T1
15
R1
14
R1
13
T1
12
T2
11
R2
10
DIP/SO
( ) ARE FOR MAX222 ONLY.
PIN NUMBERS IN TYPICAL OPERATING CIRCUIT ARE FOR DIP/SO PACKAGES ONLY.
OUT
IN
OUT
IN
IN
OUT
C1+
2
V+
3
C1-
4
C2+
C2-
V-
T2
OUT
R2
IN
R2
OUT
MAX222
5
MAX242
6
7
8
9
10
SSOP
SHDN
20
V
19
CC
GND
18
T1
17
OUT
N.C.
16
R1
15
IN
R1
14
OUT
N.C.
13
T1
12
IN
T2
11
IN
R1
12
9
R2
2
C1+
4
C1-
5
C2+
6
C2-
400k
T1
12
400k
T2
11
13
R1
10
R2
1
(N.C.)
OUT
OUT
GND
+5V INPUT
C5
V
CC
+5V TO +10V
VOLTAGE DOUBLER
+10V TO -10V
VOLTAGE INVERTER
+5V
(EXCEPT MAX220)
Ω
IN
+5V
(EXCEPT MAX220)
Ω
IN
OUT
OUT
EN
GND
R1
Ω
5k
R2
Ω
5k
15
C3
17
V+
V-
T1
OUT
T2
OUT
R1
IN
Ω
5k
R2
IN
5kΩ
SHDN
16
13
I
N
RS-232
INPUTS
8
IN
ALL CAPACITORS = 0.1µF
3
+10V
7
-10V
C4
15
RS-232
OUTPUTS
8
14
RS-232
INPUTS
9
18
MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
18 ______________________________________________________________________________________
Figure 7. MAX225 Pin Configuration and Typical Operating Circuit
TOP VIEW
T
IN
T
T
T
T
ENT
R
1
2
3
4
5
1
IN
IN
IN
IN
OUT
ENR
1
ENR
2
T
IN
1
3
T
IN
2
4
R1OUT
OUT
R
2
R
OUT
3
R
IN
3
R
IN
2
IN
R
1
T
OUT
1
T
OUT
2
GND
GND
MAX225
5
6
7
8
9
10
11
12
13
14
V
3
CC
28
V
27
CC
ENT
26
T
IN
25
3
IN
T
24
4
T
IN
23
5
OUT
R
22
4
R
OUT
21
5
R
IN
20
5
R4IN
19
OUT
T
18
3
T
OUT
17
4
OUT
T
16
5
T5OUT
15
4
25
24
23
26
5
0.1
+5V
+5V
+5V
+5V
+5V
V
400kΩ
400kΩ
400kΩ
400kΩ
400kΩ
+5V
28 27
CC
V
CC
T
OUT
1
OUT
T
2
T
OUT
3
T
OUT
4
T
OUT
5
OUT
T
5
IN
R
1
11
12
18
17
16
15
10
5kΩ
SO
OUT
R
6
2
IN
R
2
5kΩ
MAX225 FUNCTIONAL DESCRIPTION
5 RECEIVERS
5 TRANSMITTERS
2 CONTROL PINS
1 RECEIVER ENABLE (ENR)
1 TRANSMITTER ENABLE (ENT)
OUT
R
7
22
21
3
OUT
R
4
OUT
R
5
5kΩ
5kΩ
IN
R
3
IN
R
4
IN
R
5
5kΩ
ENR
1
2
PINS (ENR, GND, V
, T5OUT) ARE INTERNALLY CONNECTED.
CC
CONNECT EITHER OR BOTH EXTERNALLY. T
OUT IS A SINGLE DRIVER.
5
ENR
13
GND
GND
14
9
8
19
20
MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
______________________________________________________________________________________ 19
Figure 8. MAX223/MAX241 Pin Configuration and Typical Operating Circuit
TOP VIEW
+5V INPUT
1.0µF
1.0µF
1.0µF
12
C1+
14
C1-
15
C2+
16
C2-
11
V
CC
+5V TO +10V
VOLTAGE DOUBLER
+10V TO -10V
VOLTAGE INVERTER
V+
V-
1.0µF
13
17
1.0µF
+5V
400kΩ
5kΩ
5kΩ
T1
2
OUT
T2
3
OUT
RS-232
OUTPUTS
1
T3
OUT
T4
28
OUT
R1
IN
R2
IN
4
T1
7
IN
6
20
21
89R1
5
+5V
T2
IN
+5V
T3
IN
+5V
T4
IN
OUT
R2
OUT
1
T3
OUT
2
T1
OUT
3
T2
OUT
4
R2
IN
5
R2
OUT
T2
IN
T1
IN
R1
OUT
R1
IN
GND
V
CC
C1+
V+
C1-
MAX223
6
MAX241
7
8
9
10
11
12
13
14
28
T4
27
R3
26
R3
25
SHDN (SHDN)
24
EN (EN)
23
R4
22
R4
21
T4
20
T3
19
R5
18
R5
17
V-
16
C2-
15
C2+
OUT
IN
OUT
TTL/CMOS
INPUTS
IN*
OUT*
IN
IN
OUT*
IN*
T1
400kΩ
T2
400kΩ
T3
400kΩ
T4
R1
R2
Wide SO/
SSOP
LOGIC
OUTPUTS
26
OUT
R3
5kΩ
27R3
R3
IN
RS-232
INPUTS
*R4 AND R5 IN MAX223 REMAIN ACTIVE IN SHUTDOWN
NOTE: PIN LABELS IN ( ) ARE FOR MAX241
R4
22
OUT
R4
R4
23
IN
5kΩ
R5
19
OUT
R5
R5
18
IN
5kΩ
25
24
EN (EN)
GND
SHDN
(SHDN)
10
MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
20 ______________________________________________________________________________________
Figure 9. MAX230 Pin Configuration and Typical Operating Circuit
V+
V-
14
C1+
C1-
1
2
8
7
3
11
4
T2
IN
T1
IN
T1
OUT
T2
OUT
+5V INPUT
RS-232
INPUTS
TTL/CMOS
OUTPUTS
GND
12 (14)
5kΩ
5k
Ω
+12V TO -12V
VOLTAGE CONVERTER
13 (15)
1.0µF
1.0µF
C2
1.0µF
400k
Ω
+5V
400k
Ω
+5V
6
9
10
R1
IN
R2
IN
R2
OUT
R1
OUT
5
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
V+
V
CC
GND
T1
OUT
T2
OUT
V-
C-
C+
MAX231
R1
IN
R1
OUT
T1
IN
N.C.
N.C.
T2
IN
R2
OUT
R2
IN
SO
(12)
RS-232
OUTPUTS
TTL/CMOS
INPUTS
(11)
(13)(10)
V
CC
PIN NUMBERS IN ( ) ARE FOR SO PACKAGE
14
13
12
11
10
9
8
1
2
3
4
5
6
7
V+
V
CC
GND
T1
OUT
T2
OUT
V-
C-
C+
MAX231
R1
IN
R1
OUT
T1
IN
T2
IN
R2
OUT
R2
IN
DIP
+7.5V TO +12V
(16)
T1
T2
R1
R2
TOP VIEW
Figure 10. MAX231 Pin Configurations and Typical Operating Circuit
TOP VIEW
8
C1+
10
T3
OUT
1
T1
OUT
2
T2
OUT
3
T2
IN
4
T1
IN
GND
V
CC
C1+
V+
C1-
MAX230
5
6
7
8
9
10
DIP/SO
1.0µF
T4
OUT
20
T5
19
IN
N.C.
18
SHDN
17
T5
16
OUT
T4
15
IN
T3
14
IN
V-
13
C2-
12
C2+
11
1.0µF
TTL/CMOS
INPUTS
N.C.
C1-
11
C2+
12
C2-
T1
5
T2
4
T3
14
T4
15
T5
19
18
x
+5V INPUT
1.0µF
+5V TO +10V
VOLTAGE DOUBLER
+10V TO -10V
VOLTAGE INVERTER
+5V
400k
IN
+5V
400k
IN
+5V
400k
IN
+5V
400k
IN
+5V
400k
IN
V
Ω
Ω
Ω
Ω
Ω
GND
7
CC
T1
T1
T2
T2
T3
T3
T4
T4
T5
T5
OUT
OUT
OUT
OUT
OUT
1.0µF
9
V+
13
V-
1.0µF
2
3
RS-232
1
OUTPUTS
20
16
17
SHDN
6
MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
______________________________________________________________________________________ 21
Figure 11. MAX233/MAX233A Pin Configuration and Typical Operating Circuit
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
T3
OUT
T4
OUT
T4
IN
T3
IN
T1
IN
T2
IN
T2
OUT
T1
OUT
MAX234
V-
C2-
C2+
C1-
V+
C1+
V
CC
GND
DIP/SO
V+
V-
8
C1+
C1-
1.0µF
1.0µF
1.0µF
7
9
10
11
4
3
13
14
12
1
3
16
15
T1
IN
T3
IN
T2
IN
T4
IN
T1
OUT
T3
OUT
T2
OUT
T4
OUT
+5V INPUT
C2-
C2+
RS-232
OUTPUTS
TTL/CMOS
INPUTS
GND
5
+5V
+5V
+10V TO -10V
VOLTAGE INVERTER
V
CC
+5V TO +10V
VOLTAGE DOUBLER
6
+5V
+5V
400k
Ω
400k
Ω
400k
Ω
400k
Ω
1.0µF
1.0µF
T1
T2
T4
T3
TOP VIEW
Figure 12. MAX234 Pin Configuration and Typical Operating Circuit
TOP VIEW
T2
IN
T1
IN
R1
OUT
R1
IN
T1
OUT
GND
V
CC
(V+) C1+
GND
(V-) CS-
10
( ) ARE FOR SO PACKAGE ONLY.
1
2
3
4
5
6
7
8
9
MAX233
MAX233A
DIP/SO
20
19
18
17
16
15
14
13
12
11
R2
OUT
R2
IN
T2
OUT
V-
C2-
C2+
V+ (C1-)
C1- (C1+)
V- (C2+)
C2+ (C2-)
TTL/CMOS
INPUTS
TTL/CMOS
OUTPUTS
DO NOT MAKE
CONNECTIONS TO
THESE PINS
INTERNAL -10
POWER SUPPLY
INTERNAL +10V
POWER SUPPLY
13 (14)
12 (10)
8 (13)
14 (8)
+5V INPUT
1.0µF
7
V
+5V
T1
2
IN
+5V
T2
1
IN
R1
OUT
3
R2
OUT
20
C1+
C1-
V-
17
V-
V+
CC
Ω
400k
Ω
400k
GND GND
69
T1
OUT
T2
OUT
R1
IN
Ω
5k
R2
IN
Ω
5k
C2+
C2+
C2-
C2-
5
18
4
19
11 (12)
15
16
10 (11)
RS-232
OUTPUTS
RS-232
INPUTS
MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
22 ______________________________________________________________________________________
Figure 13. MAX235 Pin Configuration and Typical Operating Circuit
+5V INPUT
TOP VIEW
8
1.0µF
400k
V
Ω
+5V
T1
IN
12
CC
T1
3
T1
OUT
T4
T3
T1
R2
R1
OUT
OUT
OUT
OUT
R2
OUT
T2
T1
OUT
R1
GND
V
1
2
3
4
MAX235
5
IN
6
7
IN
8
IN
9
10
IN
11
12
CC
DIP
+5V
T2
7
IN
+5V
TTL/CMOS
INPUTS
24
R3
IN
23
R3
OUT
22
T5
IN
21
SHDNT2
20
EN
19
T5
OUT
18
R4
IN
17
R4
OUT
16
T4
IN
15
T3
IN
14
R5
OUT
13
R5
IN
TTL/CMOS
OUTPUTS
T3
15
IN
+5V
16
IN
+5V
22
IN
910
R1
OUT
R2
6
OUT
23
R3
OUT
400k
400k
400k
400k
Ω
T2
OUT
T2
4
Ω
2
T3
T3
OUT
RS-232
OUTPUTS
Ω
T4
1T4
T4
OUT
Ω
T5
19T5
T5
T1
R2
R3
OUT
R1
IN
Ω
5k
R2
5
IN
Ω
5k
24
R3
IN
Ω
5k
RS-232
INPUTS
R4
17
OUT
R5
14
OUT
20
EN
R4
R5
GND
5k
5k
R4
Ω
R5
Ω
SHDN
IN
IN
11
18
13
21
MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
______________________________________________________________________________________ 23
Figure 14. MAX236 Pin Configuration and Typical Operating Circuit
TOP VIEW
+5V INPUT
1.0µF
10
C1+
1.0µF
1.0µF
1
T3
OUT
2
T1
OUT
3
T2
OUT
4
IN
MAX236
5
R1
OUT
6
T2
IN
7
T1
IN
8
GND
9
V
CC
10
C1+
11
V+
12
24
T4
OUT
23
R2
IN
22
R2
OUT
21
SHDNR1
20
EN
19
T4
IN
18
T3
IN
17
R3
OUT
16
R3
IN
15
V-
14
C2-
13
C2+C1-
TTL/CMOS
INPUTS
12
13
14
7
6
18
19
54R1
C1-
C2+
C2-
T1
T2
T3
T4
VOLTAGE DOUBLER
VOLTAGE INVERTER
+5V
IN
+5V
IN
+5V
IN
+5V
IN
OUT
V
CC
+5V TO +10V
+10V TO -10V
Ω
400k
T1
Ω
400k
T2
Ω
400k
T3
Ω
400k
T4
R1
9
V+
V-
T1
OUT
T2
OUT
T3
OUT
T4
OUT
R1
IN
Ω
5k
1.0µF
11
15
1.0µF
2
3
RS-232
OUTPUTS
1
24
DIP/SO
TTL/CMOS
OUTPUTS
22
R2
OUT
R2
23
R2
IN
Ω
5k
RS-232
INPUTS
R3
17
OUT
20
EN
R3
GND
R3
16
IN
Ω
5k
21
SHDN
8
MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
24 ______________________________________________________________________________________
Figure 15. MAX237 Pin Configuration and Typical Operating Circuit
TOP VIEW
1
T3
OUT
2
T1
OUT
3
T2
OUT
4
R1
IN
MAX237
5
R1
OUT
T2
6
IN
7
T1
IN
8
GND
9
V
CC
10
C1+
11
V+
12
+5V INPUT
1.0µF
10
C1+
1.0µF
1.0µF
24
T4
OUT
23
R2
IN
22
R2
OUT
21
T5
IN
20
T5
OUT
T4
19
IN
18
T3
IN
17
R3
OUT
16
R3
IN
15
V-
14
C2-
13
C2+C1-
TTL/CMOS
INPUTS
12
C1-
13
C2+
14
C2-
T1
7
T2
6
T3
18
T4
19
T5
21
VOLTAGE INVERTER
+5V
IN
+5V
IN
+5V
IN
+5V
IN
+5V
IN
9
V
CC
+5V TO +10V
VOLTAGE DOUBLER
+10V TO -10V
400kΩ
T1
400kΩ
T2
400kΩ
T3
400kΩ
T4
400kΩ
T5
V+
V-
T1
OUT
T2
OUT
T3
OUT
T4
OUT
T5
OUT
1.0µF
11
15
1.0µF
2
3
1
RS-232
OUTPUTS
24
20
DIP/SO
TTL/CMOS
OUTPUTS
54R1
22
17
OUT
R2
OUT
R3
OUT
R1
R2
R3
GND
8
R1
5kΩ
R2
5kΩ
R3
5kΩ
IN
23
IN
IN
RS-232
INPUTS
16
MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
______________________________________________________________________________________ 25
Figure 16. MAX238 Pin Configuration and Typical Operating Circuit
TOP VIEW
T2
T1
R2
R1
OUT
OUT
R2
OUT
T1
OUT
R1
GND
V
C1+
+5V INPUT
1.0µF
10
C1+
1.0µF
1.0µF
1
2
3
IN
4
MAX238
5
IN
6
7
IN
8
9
CC
10
11
V+
12
T3
24
OUT
23
R3
IN
22
R3
OUT
21
T4
IN
20
T4
OUT
19
T3
IN
18
T2
IN
17
R4
OUT
16
R4
IN
15
V-
14
C2-
13
C2+C1-
TTL/CMOS
INPUTS
12
13
14
5
18
19
21
67R1
C1-
C2+
C2-
T1
T2
T3
T4
VOLTAGE DOUBLER
VOLTAGE INVERTER
+5V
IN
+5V
IN
+5V
IN
+5V
IN
OUT
DIP/SO
9
V
CC
+5V TO +10V
+10V TO -10V
400kΩ
T1
400kΩ
T2
400kΩ
T3
400kΩ
T4
R1
5kΩ
V+
V-
T1
OUT
T2
OUT
T3
OUT
T4
OUT
R1
IN
1.0µF
11
15
1.0µF
2
1
RS-232
OUTPUTS
24
20
TTL/CMOS
OUTPUTS
4
R2
OUT
R3
22
OUT
R4
17
OUT
R2
R3
R4
GND
8
5kΩ
5kΩ
5kΩ
3
R2
IN
RS-232
INPUTS
R3
23
IN
R4
16
IN
MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
26 ______________________________________________________________________________________
Figure 17. MAX239 Pin Configuration and Typical Operating Circuit
TOP VIEW
1
R1
OUT
2
R1
IN
3
GND
4
V
CC
MAX239
5
V+
6
C+
7
C-
8
V-
9
R5
IN
10
R5
OUT
11
R4
OUT
12
R4
IN
DIP/SO
4
+10V TO -10V
400kΩ
T1
400kΩ
T2
400kΩ
T3
R1
R2
R3
7.5V TO 13.2V
INPUT
5
V+
5kΩ
5kΩ
5kΩ
8
V-
1.0µF
T1
19
OUT
T2
OUT
20
RS-232
OUTPUTS
13
T3
OUT
R1
IN
R2
IN
18
R3
IN
RS-232
INPUTS
+5V INPUT
1.0µF
V
6
C1+
1.0µF
24
T1
IN
23
T2
IN
22
R2
OUT
21
R2
IN
20
T2
OUT
T1
19
OUT
18
R3
IN
17
R3
OUT
16
T3
IN
15
N.C.
14
EN
13
T3
OUT
TTL/CMOS
INPUTS
TTL/CMOS
OUTPUTS
7
24
23
16
12R1
2221R2
17
C1-
T1
T2
T3
R3
CC
VOLTAGE INVERTER
+5V
IN
+5V
IN
+5V
IN
OUT
OUT
OUT
R4
11
OUT
R5
10
OUT
EN
14
R4
R5
GND
3
5kΩ
5kΩ
R4
R5
IN
IN
N.C.
12
9
15
MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
______________________________________________________________________________________ 27
Figure 18. MAX240 Pin Configuration and Typical Operating Circuit
N.C.
R2
T2
T1
R1
R1
GND
V
N.C.
N.C.
N.C.
TOP VIEW
OUT
IN
IN
OUT
IN
CC
+5V INPUT
1.0µF
25
1.0µF
1.0µF
C1+
27
C1-
28
C2+
29
C2-
+5V
T1
15
IN
+5V
148T2
IN
OUT
OUT
OUTT1OUTT3OUT
R2INN.C.
T2
N.C.
6
7
8
9
10
11
12
13
14
15
16
17
18
MAX240
19
20
21
22
28
27
26
25
24
23
IN
T4
R3INR3
N.C.
T5
TTL/CMOS
N.C.
SHDN
EN
T5
OUT
R4
R4
T4
IN
T3
IN
R5
R5
N.C.
INPUTS
IN
OUT
OUT
IN
1
2
3
4
5
44
43
42
41
40
39
38
37
36
35
34
32
31
30
29
33
37
38
2
1617R1
1310R2
+5V
T3
IN
+5V
T4
IN
+5V
T5
IN
OUT
OUT
19
V
CC
+5V TO +10V
VOLTAGE DOUBLER
+5V TO -10V
VOLTAGE INVERTER
400kΩ
T1
400kΩ
T2
400kΩ
T3
400kΩ
T4
400kΩ
T5
R1
R2
5kΩ
5kΩ
V+
V-
T1
OUT
T2
OUT
T3
OUT
T4
OUT
T5
OUT
R1
IN
R2
IN
1.0µF
26
30
1.0µF
7
6
RS-232
OUTPUTS
5
41
N.C.
N.C.
C1+
V+
C1-
C2+
V-
C2
N.C.
N.C.
N.C.
Plastic FP
TTL/CMOS
OUTPUTS
3
OUT
R4
39
OUT
R3
R4
5kΩ
4R3
R3
IN
R4
IN
RS-232
INPUTS
40
5kΩ
R5
36
OUT
EN
42
R5
GND
5kΩ
R5
SHDN
35
IN
43
18
MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
28 ______________________________________________________________________________________
Figure 19. MAX243 Pin Configuration and Typical Operating Circuit
TOP VIEW
1
C1+ V
2
V+
C1-
3
MAX243
4
C2+
C2-
5
V-
6
T2
7
OUT
R2
8
IN
16
15
14
13
12
11
10
9
DIP/SO
RECEIVER INPUT
≤ -3 V
OPEN
≥ +3V
CC
GND
T1
OUT
R1
IN
R1
OUT
T1
IN
T2
IN
R2
OUT
R1 OUTPUT
HIGH
HIGH
LOW
R2 OUTPUT
HIGH
LOW
LOW
0.1µF
0.1µF
TTL/CMOS
INPUTS
TTL/CMOS
OUTPUTS
+5V INPUT
0.1µF
1
C1+
3
C1-
4
C2+
5
C2-
T1
11
T2
10
R1
12
R2
9
VOLTAGE DOUBLER
VOLTAGE INVERTER
+5V
IN
+5V
IN
OUT
OUT
16
V
CC
+5V TO +10V
+10V TO -10V
400kΩ
400kΩ
GND
15
ALL CAPACITORS = 0.1µF
0.1µF
2
+10V
V+
6
-10V
V-
0.1µF
T1
14
OUT
7
T2
OUT
R1
13
IN
5kΩ
8
R2
IN
5kΩ
RS-232
OUTPUTS
RS-232
INPUTS
MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
______________________________________________________________________________________ 29
R
Figure 20. MAX244 Pin Configuration and Typical Operating Circuit
A3
R
A2
R
A1
OUT
R
A1
R
OUT
A2
R
OUT
A3
OUT
R
A4
OUT
R
A5
T
A1
T
A2
TA3IN
TOP VIEW
IN
7
8
IN
IN
9
10
11
12
13
14
15
IN
16
IN
17
+5V
1µF
21
INT
IN
OUT
OUT
OUT
OUT
A4
A5
A4
R
6
A3
T
R
T
5
A2
T
OUT
A1
B1
T
T
441234404142
MAX244
18
21
20
IN
CC
V
A4
GND
C1+
22 2319
V+
24
C1-V-C2-
C2+
OUT
OUT
B2
T
43
25
IN
OUT
4
B5
B3
T
TB
R
39
RB4IN
38
RB3IN
37
R
36
R
35
R
34
R
33
R
32
R
31
R
30
T
29
T
26
27
28
IN
IN
B3
B4
T
T
1µF
1µF
IN
B2
IN
B1
OUT
B1
OUT
B2
OUT
B3
OUT
B4
OUT
B5
IN
B1
IN
B2
PLCC
23
24
25
215T
2
16
3
17
4
18
9R
10 R
C1+
C1-
C2+
C2-
T
T
T
T
T
T
T
+5V TO +10V VOLTAGE DOUBLER
+10V TO -10V VOLTAGE INVERTER
OUT
A1
IN
A1
OUT
A2
IN
A2
OUT
A3
IN
A3
OUT
A4
IN
A4
IN
A1
5k
OUT
A1
+5V +5V
+5V
+5V
+5V
Ω
V
400k
400k
400k
400k
20
CC
Ω
Ω
Ω
Ω
8RA2IN
+5V
+5V
+5V
1µF
TB1OUT
T
T
T
Ω
5k
R
T
B2
T
B3
T
B4
T
R
B1
RB2IN
B1
OUT
B2
OUT
B3
OUT
B4
B1
OUT
22
V+
26
V-
1µF
44
30
IN
43
IN
29
42
IN
28
41
IN
27
IN
36
35
37
MAX249 FUNCTIONAL DESCRIPTION
10 RECEIVERS
5 A-SIDE RECEIVER
5 B-SIDE RECEIVER
8 TRANSMITTERS
4 A-SIDE TRANSMITTERS
4 B-SIDE TRANSMITTERS
NO CONTROL PINS
OUT
11 R
A2
7RA3IN
12 RA3OUT
6RA4IN
13 R
OUT
A4
5RA5IN
1419RA5OUT
Ω
5k
Ω
5k
Ω
5k
Ω
5k
GND
Ω
5k
R
Ω
5k
RB3OUT
Ω
5k
R
Ω
5k
RB5OUT
B2
RB3IN
RB4IN
B4
RB5IN
OUT
OUT
34
38
33
39
32
40
31
MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
30 ______________________________________________________________________________________
Figure 21. MAX245 Pin Configuration and Typical Operating Circuit
TOP VIEW
ENR
1
IN
T
2
A1
T
IN
3
A2
4
IN
T
A3
IN
5
T
A4
R
6
OUT
A5
RA4OUT
OUT
R
A3
R
OUT
A2
OUT
R
A1
RA1IN
IN
R
A2
IN
R
A3
IN
R
A4
R
IN
A5
OUT
T
A1
T
OUT
A2
T
OUT
A3
TA4OUT
GND
MAX245
7
8
9
10
11
12
13
14
15
16
17
18
19
20
DIP
40 V
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
CC
ENT
T
IN
B1
IN
T
B2
IN
T
B3
T
IN
B4
RB5OUT
OUT
R
B4
R
OUT
B3
OUT
R
B2
RB1OUT
IN
R
B1
IN
R
B2
IN
R
B3
R
IN
B4
IN
R
B5
T
OUT
B1
T
OUT
B2
TB3OUT
T
OUT
B4
162T
A1
T
A1
17
T
A2
T
3
A2
T
18
A3
T
4
A3
T
19
A4
T
5
A4
1
ENR
11 RA1IN
10 R
A1
12 RA2IN
9R
A2
13 RA3IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
OUT
OUT
1µF
Ω
5k
Ω
5k
+5V
+5V
+5V
+5V
400k
400k
400k
400k
+5V
V
40
CC
+5V
TB1OUT
24
Ω
38
IN
T
B1
+5V
TB2OUT
23
Ω
T
IN
37
B2
+5V
OUT
T
22
B3
Ω
IN
T
36
B3
+5V
T
OUT
21
B4
Ω
T
IN
35
B4
39
ENT
RB1IN
29
Ω
5k
R
OUT
30
B1
RB2IN
28
Ω
5k
OUT
R
31
B2
RB3IN
27
Ω
5k
MAX245 FUNCTIONAL DESCRIPTION
10 RECEIVERS
8RA3OUT
14 RA4IN
5 A-SIDE RECEIVERS (RA5 ALWAYS ACTIVE)
Ω
7R
A4
15 RA5IN
OUT
5k
Ω
5k
5 B-SIDE RECEIVERS (RB5 ALWAYS ACTIVE)
8 TRANSMITTTERS
4 A-SIDE TRANSMITTERS
2 CONTROL PINS
1 RECEIVER ENABLE (ENR)
1 TRANSMITTER ENABLE (ENT)
620RA5OUT
GND
Ω
5k
RB3OUT
Ω
5k
R
Ω
5k
RB5OUT
RB4IN
B4
RB5IN
OUT
32
26
33
25
34
MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
______________________________________________________________________________________ 31
Figure 22. MAX246 Pin Configuration and Typical Operating Circuit
TOP VIEW
ENA
T
A1
T
A2
T
A3
T
A4
OUT
R
A5
RA4OUT
OUT
R
A3
R
OUT
A2
OUT
R
A1
RA1IN
R
A2
R
A3
R
A4
R
A5
OUT
T
A1
T
OUT
A2
T
OUT
A3
TA4OUT
GND
+5V
1µF
40
V
1
IN
2
IN
3
IN
4
IN
5
6
7
MAX246
8
9
10
11
IN
12
IN
13
IN
14
IN
15
16
17
18
19
20
40 V
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
CC
ENB
IN
T
B1
IN
T
B2
IN
T
B3
IN
T
B4
RB5OUT
OUT
R
B4
R
OUT
B3
OUT
R
B2
RB1OUT
IN
R
B1
IN
R
B2
IN
R
B3
R
IN
B4
IN
R
B5
T
OUT
B1
T
OUT
B2
TB3OUT
T
OUT
B4
T
16
A1
2
T
A1
173T
A2
T
A2
18
T
A3
T
4
A3
T
19
A4
T
5
A4
ENA
1
11 R
A1
10 R
A1
12 RA2IN
OUT
IN
OUT
IN
OUT
IN
OUT
IN
IN
OUT
Ω
5k
Ω
5k
+5V
+5V
+5V
+5V
400k
400k
400k
400k
CC
+5V
OUT
24
T
B1
Ω
T
38
IN
B1
+5V
23
TB2OUT
Ω
37
T
IN
B2
+5V
22
T
OUT
B3
Ω
36
T
IN
B3
+5V
21
TB4OUT
Ω
T
IN
35
B4
ENB
39
RB1IN
29
Ω
5k
R
OUT
30
B1
RB2IN
28
Ω
5k
DIP
MAX246 FUNCTIONAL DESCRIPTION
10 RECEIVERS
5 A-SIDE RECEIVERS (RA5 ALWAYS ACTIVE)
5 B-SIDE RECEIVERS (RB5 ALWAYS ACTIVE)
8 TRANSMITTERS
4 A-SIDE TRANSMITTERS
4 B-SIDE TRANSMITTERS
2 CONTROL PINS
ENABLE A-SIDE (ENA)
ENABLE B-SIDE (ENB)
9R
A2
13 RA3IN
8RA3OUT
14 RA4IN
7R
A4
15 RA5IN
6RA5OUT
OUT
OUT
OUT
R
31
B2
RB3IN
27
Ω
5k
Ω
5k
Ω
5k
GND
Ω
5k
RB3OUT
Ω
5k
R
Ω
5k
RB5OUT
B4
RB4IN
OUT
RB5IN
32
26
33
25
34
20
MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
32 ______________________________________________________________________________________
Figure 23. MAX247 Pin Configuration and Typical Operating Circuit
TOP VIEW
ENTA
1
IN
T
2
A1
T
IN
3
A2
4
IN
T
A3
5
T
IN
A4
6
OUT
R
B5
7
RA4OUT
OUT
R
A3
R
OUT
A2
OUT
R
A1
ENRA ENRB
RA1IN
IN
R
A2
IN
R
A3
IN
R
A4
OUT
T
A1
T
OUT
A2
T
OUT
A3
TA4OUT
GND
MAX247
8
9
10
11
12
13
14
15
16
17
18
19
20
DIP
MAX247 FUNCTIONAL DESCRIPTION
9 RECEIVERS
4 A-SIDE RECEIVERS
5 B-SIDE RECEIVERS (RB5 ALWAYS ACTIVE)
8 TRANSMITTERS
4 A-SIDE TRANSMITTERS
4 B-SIDE TRANSMITTERS
4 CONTROL PINS
ENABLE RECEIVER A-SIDE (ENRA)
ENABLE RECEIVER B-SIDE (ENRB)
ENABLE RECEIVER A-SIDE (ENTA)
ENABLE RECEIVERr B-SIDE (ENTB)
1
40
V
CC
39
ENTB
38
IN
T
B1
37
IN
T
B2
36
IN
T
B3
35
T
IN
B4
R
OUT
34
B4
R
OUT
33
B3
OUT
R
B2
32
RB1OUT
31
30
R
IN
29
B1
IN
R
28
B2
IN
R
27
B3
R
IN
26
B4
IN
R
25
B5
T
OUT
24
B1
T
OUT
23
B2
22
TB3OUT
T
OUT
21
B4
ENTA
16
T
A1
2
T
A1
173T
A2
T
A2
18
T
A3
4
T
A3
195T
A4
T
A4
6RB5OUT
12 R
A1
10 R
A1
13 RA2IN
9RA2OUT
14 RA3IN
8R
A3
15 RA4IN
720RA4OUT
11
OUT
IN
OUT
IN
OUT
IN
OUT
IN
IN
OUT
OUT
1µF
Ω
5k
Ω
5k
Ω
5k
Ω
5k
+5V
+5V
+5V
+5V
+5V
V
400k
400k
400k
400k
GND
40
CC
+5V
ENTB
39
T
OUT
24
B1
Ω
IN
T
38
B1
+5V
TB2OUT
23
Ω
IN
T
37
B2
+5V
T
OUT
22
B3
Ω
T
IN
36
B3
+5V
TB4OUT
21
Ω
T
35
IN
B4
25
RB5IN
Ω
5k
R
IN
29
B1
Ω
5k
R
OUT
31
B1
RB2IN
28
Ω
5k
RB2OUT
32
RB3IN
27
Ω
5k
R
OUT
33
B3
RB4IN
26
Ω
5k
RB4OUT
34
ENRB
30ENRA
MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
______________________________________________________________________________________ 33
Figure 24. MAX248 Pin Configuration and Typical Operating Circuit
R
R
R
R
R
R
ENRA
A1
A2
A3
A4
T
T
T
TA4IN
TOP VIEW
IN
A2
IN
A1
OUT
OUT
OUT
OUT
IN
A1
IN
A2
IN
A3
+5V
1µF
1µF
+5V
+5V
+5V
+5V
20
400k
400k
400k
400k
V
CC
+5V
22
V+
26
V-
1µF
ENTB
27
OUT
T
44
B1
Ω
T
IN
31
B1
+5V
43
TB2OUT
Ω
30
IN
T
B2
+5V
T
OUT
42
B3
Ω
IN
T
29
B3
+5V
41
TB4OUT
Ω
28
IN
T
B4
RB1IN
37
21
IN
IN
OUT
OUT
OUT
OUT
OUT
A3
A4
A4
A3
R
R
6
5
7
8
9
10
11
12
13
14
15
16
17
18
GND
ENTA
A2
T
T
T
MAX248
21
22 2319
20
CC
V+
V
C1+
OUT
A1
B1
B2
T
T
T
43
441234404142
25
24
C1-V-C2-
C2+
IN
OUT
OUT
B4
B3
A4
T
T
R
39
RB3IN
38
RB2IN
37
R
36
ENRB
35
R
34
R
33
R
32
R
31
T
30
T
29
T
26
27
28
IN
B4
ENTB
T
1µF
1µF
IN
B1
OUT
B1
OUT
B2
OUT
B3
OUT
B4
IN
B1
IN
B2
IN
B3
PLCC
C1+
23
C1-
24
C2+
25
C2-
18
ENTA
1
T
T
14
215T
T
T
3
16
T
417T
T
8RA1IN
+5V TO +10V VOLTAGE DOUBLER
+10V TO -10V VOLTAGE INVERTER
OUT
A1
IN
A1
OUT
A2
IN
A2
OUT
A3
IN
A3
OUT
A4
IN
A4
MAX248 FUNCTIONAL DESCRIPTION
8 RECEIVERS
4 A-SIDE RECEIVERS
4 B-SIDE RECEIVERS
8 TRANSMITTERS
4 A-SIDE TRANSMITTERS
4 B-SIDE TRANSMITTERS
4 CONTROL PINS
ENABLE RECEIVER A-SIDE (ENRA)
ENABLE RECEIVER B-SIDE (ENRB)
ENABLE RECEIVER A-SIDE (ENTA)
ENABLE RECEIVER B-SIDE (ENTB
)
OUT
10 R
A1
7RA2IN
11 RA2OUT
6RA3IN
12 R
OUT
A3
5RA4IN
1319RA4OUT
9
Ω
5k
Ω
5k
Ω
5k
Ω
5k
GND
Ω
5k
R
Ω
5k
RB2OUT
Ω
5k
R
Ω
5k
RB4OUT
B1
RB2IN
RB3IN
B3
RB4IN
ENRB
OUT
OUT
35
38
34
39
33
40
32
36ENRA
MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
34 ______________________________________________________________________________________
Figure 25. MAX249 Pin Configuration and Typical Operating Circuit
TOP VIEW
IN
IN
IN
OUT
OUT
OUT
A3
A4
A5
R
6
IN
R
7
A2
8
IN
R
A1
ENRA
9
OUT
10
R
A1
11
R
OUT
A2
OUT
R
12
A3
OUT
13
R
A4
14
OUT
R
A5
15
IN
T
A1
T
IN
16
A2
17
18
ENTA
A3
R
R
T
5
21
20
CC
V
C1+
GND
A2
T
MAX249
22 2319
V+
OUT
A1
B1
T
T
43
441234404142
25
24
C1-V-C2-
C2+
PLCC
OUT
B2
T
+5V
1µF
1µF
+5V
+5V
+5V
20
400k
400k
400k
V
CC
+5V
22
V+
26
V-
1µF
ENTB
27
OUT
T
44
B1
Ω
T
IN
30
B1
+5V
T
OUT
43
B2
Ω
T
IN
29
B2
+5V
T
OUT
42
B3
Ω
IN
T
28
B3
R
IN
37
B1
Ω
5k
R
OUT
35
B1
RB2IN
38
21
OUT
B3
T
IN
IN
B4
B5
R
R
1µF
1µF
39
RB3IN
38
RB2IN
37
IN
R
B1
36
ENRB
35
OUT
R
B1
34
RB2OUT
33
OUT
R
B3
32
OUT
R
B4
31
OUT
R
B5
T
30
IN
B1
29
INTA3IN
T
B2
26
27
28
IN
B3
ENTB
T
23
24
25
18
1
15
2
16
3
17
8R
10 R
C1+
C1-
C2+
C2-
ENTA
T
A1
T
A1
T
A2
T
A2
T
A3
T
A3
A1
A1
+5V TO +10V VOLTAGE DOUBLER
+10V TO -10V VOLTAGE INVERTER
OUT
IN
OUT
IN
OUT
IN
IN
Ω
5k
OUT
7RA2IN
Ω
5k
OUT
11 R
MAX249 FUNCTIONAL DESCRIPTION
10 RECEIVERS
5 A-SIDE RECEIVERS
5 B-SIDE RECEIVERS
6 TRANSMITTERS
3 A-SIDE TRANSMITTERS
3 B-SIDE TRANSMITTERS
4 CONTROL PINS
ENABLE RECEIVER A-SIDE (ENRA)
ENABLE RECEIVER B-SIDE (ENRB)
ENABLE RECEIVER A-SIDE (ENTA)
A2
6RA3IN
12 RA3OUT
5RA4IN
13 R
OUT
A4
4RA5IN
Ω
5k
Ω
5k
ENABLE RECEIVER B-SIDE (ENTB)
Ω
5k
1419RA5OUT
9
GND
Ω
5k
R
Ω
5k
RB3OUT
Ω
5k
R
Ω
5k
RB5OUT
B2
RB3IN
RB4IN
B4
RB5IN
ENRB
OUT
OUT
34
39
33
40
32
41
31
36ENRA
MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
______________________________________________________________________________________ 35
___________________________________________Ordering Information (continued)
PART
MAX222CPN
0°C to +70°C
TEMP RANGE PIN-PACKAGE PART TEMP RANGE PIN-PACKAGE
18 Plastic DIP
MAX222CWN 0°C to +70°C 18 Wide SO
MAX222C/D 0°C to +70°C Dice*
MAX222EPN -40°C to +85°C 18 Plastic DIP
MAX222EWN -40°C to +85°C 18 Wide SO
MAX222EJN -40°C to +85°C 18 CERDIP
MAX222MJN -55°C to +125°C 18 CERDIP
MAX223CAI
0°C to +70°C 28 SSOP
MAX223CWI 0°C to +70°C 28 Wide SO
MAX223C/D 0°C to +70°C Dice*
MAX223EAI -40°C to +85°C 28 SSOP
MAX223EWI -40°C to +85°C 28 Wide SO
MAX225CWI
0°C to +70°C 28 Wide SO
MAX225EWI -40°C to +85°C 28 Wide SO
MAX230CPP
0°C to +70°C 20 Plastic DIP
MAX230CWP 0°C to +70°C 20 Wide SO
MAX230C/D 0°C to +70°C Dice*
MAX230EPP -40°C to +85°C 20 Plastic DIP
MAX230EWP -40°C to +85°C 20 Wide SO
MAX230EJP -40°C to +85°C 20 CERDIP
MAX230MJP -55°C to +125°C 20 CERDIP
MAX231CPD
0°C to +70°C 14 Plastic DIP
MAX231CWE 0°C to +70°C 16 Wide SO
MAX231CJD 0°C to +70°C 14 CERDIP
MAX231C/D 0°C to +70°C Dice*
MAX231EPD -40°C to +85°C 14 Plastic DIP
MAX231EWE -40°C to +85°C 16 Wide SO
MAX231EJD -40°C to +85°C 14 CERDIP
MAX231MJD -55°C to +125°C 14 CERDIP
MAX232CPE
0°C to +70°C 16 Plastic DIP
MAX232CSE 0°C to +70°C 16 Narrow SO
MAX232CWE 0°C to +70°C 16 Wide SO
MAX232C/D 0°C to +70°C Dice*
MAX232EPE -40°C to +85°C 16 Plastic DIP
MAX232ESE -40°C to +85°C 16 Narrow SO
MAX232EWE -40°C to +85°C 16 Wide SO
MAX232EJE -40°C to +85°C 16 CERDIP
MAX232MJE -55°C to +125°C 16 CERDIP
MAX232MLP -55°C to +125°C 20 LCC
MAX232ACPE
0°C to +70°C 16 Plastic DIP
MAX232ACSE 0°C to +70°C 16 Narrow SO
MAX232ACWE 0°C to +70°C 16 Wide SO
MAX232AC/D
MAX232AEPE -40°C to +85°C 16 Plastic DIP
MAX232AESE
0°C to +70°C Dice*
-40°C to +85°C 16 Narrow SO
MAX232AEWE -40°C to +85°C 16 Wide SO
MAX232AEJE -40°C to +85°C 16 CERDIP
MAX232AMJE -55°C to +125°C 16 CERDIP
MAX232AMLP -55°C to +125°C 20 LCC
MAX233CPP
0°C to +70°C 20 Plastic DIP
MAX233EPP -40°C to +85°C 20 Plastic DIP
MAX233ACPP
0°C to +70°C 20 Plastic DIP
MAX233ACWP 0°C to +70°C 20 Wide SO
MAX233AEPP -40°C to +85°C 20 Plastic DIP
MAX233AEWP -40°C to +85°C 20 Wide SO
MAX234CPE
0°C to +70°C 16 Plastic DIP
MAX234CWE 0°C to +70°C 16 Wide SO
MAX234C/D 0°C to +70°C Dice*
MAX234EPE -40°C to +85°C 16 Plastic DIP
MAX234EWE -40°C to +85°C 16 Wide SO
MAX234EJE -40°C to +85°C 16 CERDIP
MAX234MJE -55°C to +125°C 16 CERDIP
MAX235CPG
0°C to +70°C 24 Wide Plastic DIP
MAX235EPG -40°C to +85°C 24 Wide Plastic DIP
MAX235EDG -40°C to +85°C 24 Ceramic SB
MAX235MDG -55°C to +125°C 24 Ceramic SB
MAX236CNG
0°C to +70°C 24 Narrow Plastic DIP
MAX236CWG 0°C to +70°C 24 Wide SO
MAX236C/D 0°C to +70°C Dice*
MAX236ENG -40°C to +85°C 24 Narrow Plastic DIP
MAX236EWG -40°C to +85°C 24 Wide SO
MAX236ERG -40°C to +85°C 24 Narrow CERDIP
MAX236MRG -55°C to +125°C 24 Narrow CERDIP
MAX237CNG
0°C to +70°C 24 Narrow Plastic DIP
MAX237CWG 0°C to +70°C 24 Wide SO
MAX237C/D 0°C to +70°C Dice*
MAX237ENG -40°C to +85°C 24 Narrow Plastic DIP
MAX237EWG -40°C to +85°C 24 Wide SO
MAX237ERG -40°C to +85°C 24 Narrow CERDIP
MAX237MRG -55°C to +125°C 24 Narrow CERDIP
MAX238CNG
0°C to +70°C 24 Narrow Plastic DIP
MAX238CWG 0°C to +70°C 24 Wide SO
MAX238C/D 0°C to +70°C Dice*
MAX238ENG -40°C to +85°C 24 Narrow Plastic DIP
* Contact factory for dice specifications.
MAX220–MAX249
+5V-Powered, Multichannel RS-232
Drivers/Receivers
___________________________________________Ordering Information (continued)
* Contact factory for dice specifications.
18 CERDIP-55°C to +125°CMAX242MJN
18 CERDIP-40°C to +85°CMAX242EJN
18 Wide SO-40°C to +85°CMAX242EWN
18 Plastic DIP-40°C to +85°CMAX242EPN
Dice*0°C to +70°CMAX242C/D
18 Wide SO0°C to +70°CMAX242CWN
18 Plastic DIP0°C to +70°CMAX242CPN
20 SSOP0°C to +70°C
MAX242CAP
28 Wide SO-40°C to +85°CMAX241EWI
28 SSOP-40°C to +85°CMAX241EAI
Dice*0°C to +70°CMAX241C/D
28 Wide SO0°C to +70°CMAX241CWI
28 SSOP0°C to +70°C
MAX241CAI
Dice*0°C to +70°CMAX240C/D
44 Plastic FP0°C to +70°C
MAX240CMH
24 Narrow CERDIP-55°C to +125°CMAX239MRG
24 Narrow CERDIP-40°C to +85°CMAX239ERG
24 Wide SO-40°C to +85°CMAX239EWG
24 Narrow Plastic DIP-40°C to +85°CMAX239ENG
Dice*0°C to +70°CMAX239C/D
24 Wide SO0°C to +70°CMAX239CWG
24 Narrow Plastic DIP0°C to +70°C
MAX239CNG
24 Narrow CERDIP-55°C to +125°C
24 Wide SO
PIN-PACKAGETEMP RANGE
-40°C to +85°C
MAX238MRG
24 Narrow CERDIP-40°C to +85°CMAX238ERG
MAX238EWG
PART PIN-PACKAGETEMP RANGEPART
44 PLCC-40°C to +85°CMAX249EQH
44 PLCC0°C to +70°C
MAX249CQH
44 PLCC-40°C to +85°CMAX248EQH
Dice*0°C to +70°CMAX248C/D
44 PLCC0°C to +70°C
MAX248CQH
40 Plastic DIP-40°C to +85°CMAX247EPL
Dice*0°C to +70°CMAX247C/D
40 Plastic DIP0°C to +70°C
MAX247CPL
40 Plastic DIP-40°C to +85°CMAX246EPL
Dice*0°C to +70°CMAX246C/D
40 Plastic DIP0°C to +70°C
MAX246CPL
40 Plastic DIP-40°C to +85°CMAX245EPL
Dice*0°C to +70°CMAX245C/D
40 Plastic DIP0°C to +70°C
MAX245CPL
44 PLCC-40°C to +85°CMAX244EQH
Dice*0°C to +70°CMAX244C/D
44 PLCC0°C to +70°C
MAX244CQH
16 CERDIP-55°C to +125°CMAX243MJE
16 CERDIP-40°C to +85°CMAX243EJE
16 Wide SO-40°C to +85°CMAX243EWE
16 Narrow SO-40°C to +85°CMAX243ESE
16 Plastic DIP-40°C to +85°CMAX243EPE
Dice*0°C to +70°CMAX243C/D
16 Wide SO0°C to +70°C
16 Plastic DIP0°C to +70°C
MAX243CWE
16 Narrow SO0°C to +70°CMAX243CSE
MAX243CPE
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
36 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600
© 2006 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.
Package Information
For the latest package outline information, go to
www.maxim-ic.com/packages
.
Revision History
Pages changed at Rev 15: 2–5, 8, 9, 36
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