MAXIM MAX249 User Manual

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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

+5V-Powered, Multichannel RS-232

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