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MAX 3232 CWE
Datasheet
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FREI MAX 3232 CWE Datasheet

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General Description
The MAX3222E/MAX3232E/MAX3237E/MAX3241E/ MAX3246E +3.0V-powered EIA/TIA-232 and V.28/V.24 communications interface devices feature low power con­sumption, high data-rate capabilities, and enhanced electrostatic-discharge (ESD) protection. The enhanced ESD structure protects all transmitter outputs and receiver inputs to ±15kV using IEC 1000-4-2 Air-Gap Discharge, ±8kV using IEC 1000-4-2 Contact Discharge (±9kV for MAX3246E), and ±15kV using the Human Body Model. The logic and receiver I/O pins of the MAX3237E are protected to the above standards, while the transmit­ter output pins are protected to ±15kV using the Human Body Model.
A proprietary low-dropout transmitter output stage delivers true RS-232 performance from a +3.0V to +5.5V power supply, using an internal dual charge pump. The charge pump requires only four small 0.1µF capacitors for opera­tion from a +3.3V supply. Each device guarantees opera­tion at data rates of 250kbps while maintaining RS-232 output levels. The MAX3237E guarantees operation at 250kbps in the normal operating mode and 1Mbps in the MegaBaud™ operating mode, while maintaining RS-232­compliant output levels.
The MAX3222E/MAX3232E have two receivers and two transmitters. The MAX3222E features a 1µA shutdown mode that reduces power consumption in battery-pow­ered portable systems. The MAX3222E receivers remain active in shutdown mode, allowing monitoring of external devices while consuming only 1µA of supply current. The MAX3222E and MAX3232E are pin, package, and func­tionally compatible with the industry-standard MAX242 and MAX232, respectively.
The MAX3241E/MAX3246E are complete serial ports (three drivers/five receivers) designed for notebook and subnotebook computers. The MAX3237E (five drivers/ three receivers) is ideal for peripheral applications that require fast data transfer. These devices feature a shut­down mode in which all receivers remain active, while consuming only 1µA (MAX3241E/MAX3246E) or 10nA (MAX3237E).
The MAX3222E, MAX3232E, and MAX3241E are avail­able in space-saving SO, SSOP, TQFN and TSSOP pack­ages. The MAX3237E is offered in an SSOP package. The MAX3246E is offered in the ultra-small 6 x 6 UCSP™ package.
Applications
Battery-Powered Equipment Printers Cell Phones Smart Phones Cell-Phone Data Cables xDSL Modems Notebook, Subnotebook,
and Palmtop Computers
Next-Generation Device Features
♦ For Space-Constrained Applications
MAX3228E/MAX3229E: ±15kV ESD-Protected, +2.5V to +5.5V, RS-232 Transceivers in UCSP
♦ For Low-Voltage or Data Cable Applications
MAX3380E/MAX3381E: +2.35V to +5.5V, 1µA, 2Tx/2Rx, RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins
MAX3222E/MAX3232E/MAX3237E/MAX3241E
†
/MAX3246E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
________________________________________________________________ Maxim Integrated Products 1
19-1298; Rev 10; 1/06
_______________Ordering Information
Ordering Information continued at end of data sheet.
*Dice are tested at TA= +25°C, DC parameters only.
**EP = Exposed paddle.
Pin Configurations, Selector Guide, and Typical Operating Circuits appear at end of data sheet.
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.
PART
TEMP RANGE
PIN­PACKAGE
PKG
CODE
MAX3222ECTP
20 Thin QFN­EP** (5mm x 5mm)
T2055-5
MAX3222ECUP
20 TSSOP —
MAX3222ECAP
20 SSOP —
MAX3222ECWN
18 Wide SO —
MAX3222ECPN
—
MAX3222EC/D
Dice* —
MAX3222EETP
20 Thin QFN­EP** (5mm x 5mm)
T2055-5
MAX3222EEUP
20 TSSOP —
MAX3222EEAP
20 SSOP —
MAX3222EEWN
18 Wide SO —
MAX3222EEPN
—
MAX3232ECAE
16 SSOP —
MAX3232ECWE
16 Wide SO —
MAX3232ECPE
—
MegaBaud and UCSP are trademarks of Maxim Integrated Products, Inc.
†
Covered by U.S. Patent numbers 4,636,930; 4,679,134; 4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761; and other patents pending.
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C 18 Plastic DIP
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C 18 Plastic DIP
0°C to +70°C
0°C to +70°C
0°C to +70°C 16 Plastic DIP
MAX3222E/MAX3232E/MAX3237E/MAX3241E
†
/MAX3246E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC= +3V to +5.5V, C1–C4 = 0.1µF, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Notes 3, 4)
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.
VCCto GND..............................................................-0.3V to +6V
V+ to GND (Note 1) ..................................................-0.3V to +7V
V- to GND (Note 1) ...................................................+0.3V to -7V
V+ + |V-| (Note 1).................................................................+13V
Input Voltages
T_IN,
EN, SHDN, MBAUD to GND ........................-0.3V to +6V
R_IN to GND .....................................................................±25V
Output Voltages
T_OUT to GND...............................................................±13.2V
R_OUT, R_OUTB (MAX3241E)................-0.3V to (V
CC
+ 0.3V)
Short-Circuit Duration, T_OUT to GND.......................Continuous
Continuous Power Dissipation (T
A
= +70°C)
16-Pin SSOP (derate 7.14mW/°C above +70°C) ..........571mW
16-Pin TSSOP (derate 9.4mW/°C above +70°C) .......754.7mW
16-Pin TQFN (derate 20.8mW/°C above +70°C) .....1666.7mW
16-Pin Wide SO (derate 9.52mW/°C above +70°C) .....762mW
18-Pin Wide SO (derate 9.52mW/°C above +70°C) .....762mW
18-Pin PDIP (derate 11.11mW/°C above +70°C)..........889mW
20-Pin TQFN (derate 21.3mW/°C above +70°C) ........1702mW
20-Pin TSSOP (derate 10.9mW/°C above +70°C) ........879mW
20-Pin SSOP (derate 8.00mW/°C above +70°C) ..........640mW
28-Pin SSOP (derate 9.52mW/°C above +70°C) ..........762mW
28-Pin Wide SO (derate 12.50mW/°C above +70°C) .............1W
28-Pin TSSOP (derate 12.8mW/°C above +70°C) ......1026mW
32-Lead Thin QFN (derate 33.3mW/°C above +70°C)..2666mW
6 x 6 UCSP (derate 12.6mW/°C above +70°C) .............1010mW
Operating Temperature Ranges
MAX32_ _EC_ _ ...................................................0°C to +70°C
MAX32_ _EE_ _.................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Bump Reflow Temperature (Note 2)
Infrared, 15s..................................................................+200°C
Vapor Phase, 20s..........................................................+215°C
Note 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V. Note 2: This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the device
can be exposed to during board-level solder attach and rework. This limit permits only the use of the solder profiles recom­mended in the industry-standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and convection reflow. Preheating is required. Hand or wave soldering is not allowed.
PARAMETER CONDITIONS
MIN
TYP
MAX
UNITS
DC CHARACTERISTICS (VCC = +3.3V or +5V, TA = +25°C)
MAX3222E, MAX3232E, MAX3241E, MAX3246E
0.3 1
Supply Current SHDN = VCC, no load
MAX3237E 0.5 2.0
mA
SHDN = GND 1 10 µA
Shutdown Supply Current
10 300 nA
LOGIC INPUTS
Input Logic Low T_IN, EN, SHDN, MBAUD 0.8 V
VCC = +3.3V 2.0
Input Logic High T_IN, EN, SHDN, MBAUD
V
CC
= +5.0V 2.4
V
Transmitter Input Hysteresis 0.5 V
T_IN, EN, SHDN
MAX3222E, MAX3232E, MAX3241E, MAX3246E
±1
Input Leakage Current
T_IN, SHDN, MBAUD MAX3237E (Note 5) 9 18
µA
RECEIVER OUTPUTS
Output Leakage Current
R_OUT (MAX3222E/MAX3237E/MAX3241E/ MAX3246E), EN = V
CC
, receivers disabled
µA
Output-Voltage Low
I
OUT
= 1.6mA (MAX3222E/MAX3232E/MAX3241E/
MAX3246E), I
OUT
= 1.0mA (MAX3237E)
0.4 V
SHDN = R_IN = GND, T_IN = GND or VCC (MAX3237E)
±0.01
±0.05 ±10
MAX3222E/MAX3232E/MAX3237E/MAX3241E
†
/MAX3246E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VCC= +3V to +5.5V, C1–C4 = 0.1µF, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Notes 3, 4)
PARAMETER CONDITIONS
UNITS
Output-Voltage High I
OUT
= -1.0mA
0.6
0.1
V
RECEIVER INPUTS
Input Voltage Range -25
V
VCC = +3.3V 0.6 1.1
Input Threshold Low TA = +25°C
V
CC
= +5.0V 0.8 1.5
V
VCC = +3.3V 1.5 2.4
Input Threshold High TA = +25°C
V
CC
= +5.0V 2.0 2.4
V
Input Hysteresis 0.5 V
Input Resistance TA = +25°C 3 5 7 kΩ
TRANSMITTER OUTPUTS
Output Voltage Swing
All transmitter outputs loaded with 3kΩ to ground (Note 6)
±5
V
Output Resistance VCC = 0, transmitter output = ±2V
Ω
Output Short-Circuit Current
mA
Output Leakage Current
V
C C
= 0 or + 3.0V to + 5.5V , V
OU T
= ± 12V , tr ansm i tter s
d i sab l ed ( M AX 3222E /M AX 3232E /M AX 3241E /M AX 3246E )
µA
MOUSE DRIVABILITY (MAX3241E)
Transmitter Output Voltage
T1IN = T2IN = GND, T3IN = V
CC
, T3OUT loaded with 3kΩ to GND, T1OUT and T2OUT loaded with 2.5mA each
±5 V
ESD PROTECTION
Human Body Model
IEC 1000-4-2 Air-Gap Discharge (except MAX3237E)
IEC 1000-4-2 Contact Discharge (except MAX3237E) ±8
R_IN, T_OUT
IEC 1000-4-2 Contact Discharge (MAX3246E only) ±9
kV
Human Body Model
IEC1000-4-2 Air-Gap Discharge
T_IN, R_IN, R_OUT, EN, SHDN, MBAUD
MAX3237E
IEC1000-4-2 Contact Discharge ±8
kV
MIN TYP MAX
VCC -
300 50k
VCC -
±5.4
±15
±15
±15
±15
+25
±60
±25
MAX3222E/MAX3232E/MAX3237E/MAX3241E
†
/MAX3246E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
4 _______________________________________________________________________________________
TIMING CHARACTERISTICS—MAX3237E
(VCC= +3V to +5.5V, C1–C4 = 0.1µF, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Note 3)
Note 3: MAX3222E/MAX3232E/MAX3241E: C1–C4 = 0.1µF tested at +3.3V ±10%; C1 = 0.047µF, C2, C3, C4 = 0.33µF tested at +5.0V
±10%. MAX3237E: C1–C4 = 0.1µF tested at +3.3V ±5%, C1–C4 = 0.22µF tested at +3.3V ±10%; C1 = 0.047µF, C2, C3, C4 =
0.33µF tested at +5.0V ±10%. MAX3246E; C1-C4 = 0.22µF tested at +3.3V ±10%; C1 = 0.22µF, C2, C3, C4 = 0.54µF tested at
5.0V ±10%.
Note 4: MAX3246E devices are production tested at +25°C. All limits are guaranteed by design over the operating temperature range. Note 5: The MAX3237E logic inputs have an active positive feedback resistor. The input current goes to zero when the inputs are at
the supply rails.
Note 6: MAX3241EEUI is specified at T
A
= +25°C.
Note 7: Transmitter skew is measured at the transmitter zero crosspoints.
PARAMETER CONDITIONS
MIN
TYP
MAX
UNITS
RL = 3kΩ, CL = 1000pF, one transmitter switching, MBAUD = GND
VCC = +3.0V to +4.5V, RL = 3kΩ, CL = 250pF, one transmitter switching, MBAUD = V
CC
Maximum Data Rate
V
CC
= +4.5V to +5.5V, RL = 3kΩ, CL = 1000pF,
one transmitter switching, MBAUD = V
CC
kbps
t
PHL
Receiver Propagation Delay R_IN to R_OUT, CL = 150pF
t
PLH
µs
Receiver Output Enable Time Normal operation
µs
Receiver Output Disable Time Normal operation
µs
| t
PHL
- t
PLH
|, MBAUD = GND
Transmitter Skew (Note 7)
| t
PHL
- t
PLH
|, MBAUD = V
CC
ns
Receiver Skew | t
PHL
- t
PLH
|
ns
MBAUD = GND 6 30
CL = 150pF to 1000pF
MBAUD = V
CC
VCC = +3.3V,
-3.0V to +3.0V, T
A
= +25°C
C
L
= 150pF to 2500pF,
MBAUD = GND
430
V/µs
Transition-Region Slew Rate
TIMING CHARACTERISTICS—MAX3222E/MAX3232E/MAX3241E/MAX3246E
(VCC= +3V to +5.5V, C1–C4 = 0.1µF, TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.) (Notes 3, 4)
PARAMETER
CONDITIONS
UNITS
TA = T
MIN
to T
MAX
(MAX3222E/MAX3232E/ MAX3241E) (Note 6)
Maximum Data Rate
R
L
= 3kΩ,
C
L
= 1000pF, one transmitter switching T
A
= + 25°C ( M AX 3246E )
kbps
t
PHL
Receiver Propagation Delay
t
PLH
Receiver input to receiver output, C
L
= 150pF
µs
Receiver Output Enable Time Normal operation (except MAX3232E)
ns
Receiver Output Disable Time Normal operation (except MAX3232E)
ns
Transmitter Skew
(Note 7)
ns
Receiver Skew
ns
Transition-Region Slew Rate
V
C C
= + 3.3V , TA = + 25°C ,
R
L
= 3kΩ to 7kΩ , m easur ed
fr om + 3.0V to - 3.0V or - 3.0V to
630
V/µs
|t
|t
SYMBOL
- t
PHL
PLH
- t
PHL
PLH
|
|50
C
= 150pF
L
to 1000pF
+ 3.0V , one tr ansm i tter sw i tchi ng
MIN TYP MAX
250
250
0.15
0.15
200
200
100
RL = 3kΩ to 7kΩ, +3.0V to -3.0V or
250
1000
1000
0.15
0.15
2.6
2.4
100
50
24 150
MAX3222E/MAX3232E/MAX3237E/MAX3241E
†
/MAX3246E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
_______________________________________________________________________________________ 5
-6
-4
-2
0
2
4
6
0
MAX3237E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE (MBAUD = GND)
MAX3237E toc07
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
1000 1500500 2000 2500 3000
FOR DATA RATES UP TO 250kbps 1 TRANSMITTER AT 250kbps 4 TRANSMITTERS AT 15.6kbps ALL TRANSMITTERS LOADED WITH 3kΩ + C
L
5
3
1
-1
-3
-5
V
OUT+
V
OUT-
-6
-2
-4
2
0
4
6
-5
-3
1
-1
3
5
0 1000 1500500 2000 2500 3000
MAX3246E toc07A
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
V
OUT-
V
OUT
+
FOR DATA RATES UP TO 250kbps 1 TRANSMITTER 250kbps 4 TRANSMITTERS 15.6kbps ALL TRANSMITTERS LOADED WITH 3kΩ + C
L
MAX3237E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
-7.5
-5.0
-2.5
0
2.5
5.0
7.5
0
MAX3237E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE (MBAUD = V
CC
)
MAX3237E toc08
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
500 1000 1500 2000
1 TRANSMITTER AT FULL DATA RATE 4 TRANSMITTERS AT 1/16 DATA RATE 3kΩ + C
L
LOAD, EACH OUTPUT
2Mbps
1.5Mbps
1Mbps
2Mbps
1Mbps
1.5Mbps
__________________________________________Typical Operating Characteristics
(VCC= +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ and CL, TA = +25°C, unless otherwise noted.)
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
0 1000 2000 3000 4000 5000
MAX3241E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3237E to04
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
1 TRANSMITTER AT 250kbps 2 TRANSMITTERS AT 15.6kbps
V
OUT+
V
OUT-
0
30
20
10
40
50
60
0 20001000 3000 4000 5000
MAX3241E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3237E toc06
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)
250kbps
120kbps
20kbps
1 TRANSMITTER AT 250kbps 2 TRANSMITTERS AT 15.6kbps
0
4
2
8
6
12
10
14
0 1000 2000 3000 4000 5000
MAX3241E
SLEW RATE vs. LOAD CAPACITANCE
MAX3237E toc05
LOAD CAPACITANCE (pF)
SLEW RATE (V/µs)
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
0 1000 2000 3000 4000 5000
MAX3222E/MAX3232E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3237E toc01
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
T1 TRANSMITTING AT 250kbps T2 TRANSMITTING AT 15.6kbps
V
OUT+
V
OUT-
0
6
2
4
10
8
14
12
16
0 1000 2000 3000 4000 5000
MAX3222E/MAX3232E
SLEW RATE vs. LOAD CAPACITANCE
MAX3237E toc02
LOAD CAPACITANCE (pF)
SLEW RATE (V/µs)
+SLEW
FOR DATA RATES UP TO 250kbps
-SLEW
0
25
20
15
5
10
35
30
40
45
0 20001000 3000 4000 5000
MAX3222E/MAX3232E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3237E toc03
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)
250kbps
120kbps
20kbps
T1 TRANSMITTING AT 250kbps T2 TRANSMITTING AT 15.6kbps
MAX3222E/MAX3232E/MAX3237E/MAX3241E
†
/MAX3246E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(VCC= +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ and CL, TA = +25°C, unless otherwise noted.)
0
20
60
40
80
100
0
MAX3237E
TRANSMITTER SKEW vs. LOAD CAPACITANCE
(MBAUD = V
CC
)
MAX3237E toc12
LOAD CAPACITANCE (pF)
1000 1500500 2000
TRANSMITTER SKEW (ns)
|t
PLH
- t
PHL
| 1 TRANSMITTER AT 500kbps 4 TRANSMITTERS AT 1/16 DATA RATE ALL TRANSMITTERS LOADED WITH 3kΩ + C
L
-6
-2
-4
2
0
4
6
-3
-5
1
-1
3
5
2.0 3.0 3.52.5 4.0 4.5 5.0
MAX3237E toc13
SUPPLY VOLTAGE (V)
TRANSMITTER OUTPUT VOLTAGE (V)
V
OUT-
V
OUT
+
1 TRANSMITTER AT 250kbps 4 TRANSMITTERS AT 15.6kbps ALL TRANSMITTERS LOADED WITH 3kΩ +1000pF
MAX3237E
TRANSMITTER OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE (MBAUD = GND)
0
10
20
30
40
50
2.0
MAX3237E SUPPLY CURRENT
vs. SUPPLY VOLTAGE (MBAUD = GND)
MAX3237E toc14
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
3.0 3.52.5 4.0 4.5 5.0
1 TRANSMITTER AT 250kbps 4 TRANSMITTERS AT 15.6kbps ALL TRANSMITTERS LOADED WITH 3kΩ AND 1000pF
MAX3246E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3237E toc15
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
400030001000 2000
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
7
-6 0 5000
1 TRANSMITTER AT 250kbps 2 TRANSMITTERS AT 15.6kbps
V
OUT-
V
OUT+
4
6
8
10
12
14
16
0
MAX3246E
SLEW RATE vs. LOAD CAPACITANCE
MAX3237E toc16
LOAD CAPACITANCE (pF)
SLEW RATE (V/µs)
2000 30001000 4000 5000
SR+
SR-
0
10
20
30
40
50
60
0
MAX3246E
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3237E toc17
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)
1000 2000 3000 4000 5000
1 TRANSMITTER AT 250kbps 2 TRANSMITTERS AT 15.6kbps
55
45
35
25
15
5
250kbps
120kbps
20kbps
0
2
4
6
8
10
12
0
MAX3237E
SLEW RATE vs. LOAD CAPACITANCE
(MBAUD = GND)
MAX3237E toc09
LOAD CAPACITANCE (pF)
SLEW RATE (V/µs)
1000 1500500 2000 2500 3000
SR+
SR-
1 TRANSMITTER AT 250kbps 4 TRANSMITTERS AT 15.6kbps ALL TRANSMITTERS LOADED WITH 3kΩ + C
L
0
10
20
30
50
40
60
70
0
MAX3237E
SLEW RATE vs. LOAD CAPACITANCE
(MBAUD = V
CC
)
MAX3237E toc10
LOAD CAPACITANCE (pF)
SLEW RATE (V/µs)
500 1000 1500 2000
-SLEW, 1Mbps +SLEW, 1Mbps
1 TRANSMITTER AT FULL DATA RATE 4 TRANSMITTERS AT 1/16 DATA RATE 3kΩ + C
L
LOAD EACH OUTPUT
-SLEW, 2Mbps +SLEW, 2Mbps
0
10
20
30
40
50
0
MAX3237E
SUPPLY CURRENT vs. LOAD CAPACITANCE
WHEN TRANSMITTING DATA (MBAUD = GND)
MAX3237E toc11
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)
1000 1500500 2000 2500 3000
250kbps
120kbps
20kbps
1 TRANSMITTER AT 20kbps, 120kbps, 250kbps 4 TRANSMITTERS AT 15.6kbps ALL TRANSMITTERS LOADED WITH 3kΩ + C
L
MAX3222E/MAX3232E/MAX3237E/MAX3241E
†
/MAX3246E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
_______________________________________________________________________________________ 7
*These pins have an active positive feedback resistor internal to the MAX3237E, allowing unused inputs to be left unconnected.
Pin Description
PIN
MAX3222E MAX3232E
TQFN
SO/DIP/
16-PIN
NAME
FUNCTION
19
1—— — 13* 23
B3 EN
Receiver Enable. Active low.
1
2
12 2828
F3
Positive Terminal of Voltage-Doubler Charge­Pump Capacitor
20
3
23 2727
F1 V+
+5.5V Generated by the Charge Pump
2
413 4 25 24
F4
Negative Terminal of Voltage-Doubler Charge­Pump Capacitor
3
524 5 1 1
E1
Positive Terminal of Inverting Charge-Pump Capacitor
4
635 6 3 2
D1
Negative Terminal of Inverting Charge-Pump Capacitor
5
746 7 4 3
C1 V-
-5.5V Generated by the Charge Pump
6, 15
8,
5,
5, 6, 7,
10, 12
9,
10,
11
6, 7,
8
F6, E6,
D6
RS-232 Transmitter Outputs
7, 14
9,
6,
A4, A5, A6, B6,
C6
RS-232 Receiver Inputs
8, 13
10,
7,
12,
15
18, 20,
21
13, 14, 15,
C2, B1, A1, A2,
A3
TTL/CMOS Receiver Outputs
10, 11
11,
13,
14
17*, 19*, 22*, 23*,
24*
12, 13,
14
10, 11,
E3, E2,
D2
TTL/CMOS Transmitter Inputs
MAX3241E
SO/
TSSOP/
DIP
SSOP
1
2
3
4
5
6
7
8, 17
15
9, 16
14
10, 15
13
12, 13 8, 9 10, 11
12
TQFN
SSOP/
TSSOP
16
15
7, 14 8, 17
12
8, 13 9, 16 8, 9, 11 4–8 1–5
11
9, 12
10
20-PIN TSSOP
MAX3237E
SSOP/
SO
15–19
17, 18
QFN
22
28
27
23
29
30
31
12
MAX3246E
C1+
C1-
C2+
C2-
T_OUT
R_IN
R_OUT
T_IN
MAX3222E/MAX3232E/MAX3237E/MAX3241E
†
/MAX3246E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
8 _______________________________________________________________________________________
Pin Description (continued)
PIN
MAX3222E MAX3232E
TQFN
SO/DIP/
16-PIN
FUNCTION
16
18
15 18 2 25
F5
Ground
17
19
16 19 26 26
F2
+3.0V to +5.5V Supply Voltage
18
20 — — — 14* 22
B2
Shutdown Control. Active low.
9, 12
——
1, 10,
——
25,
C3, D3, B4,
C4, D4, E4,
B5, C5, D5,
E5
No Connection. For MAX3246E, these locations are not populated with solder bumps.
—
——— — 15* —
—
MegaBaud Control Input. Connect to GND for normal operation; connect to VCC for 1Mbps transmission rates.
—
——— — 16
20,
21
—
Noninverting Complementary Receiver Outputs. Always active.
EP
—
—— — —
—
Exposed Paddle. Solder the exposed paddle to the ground alone or leave unconnected.
MAX3241E
SO/ DIP
16
TSSOP/
SSOP
TQFN
13
SSOP/
TSSOP
20-PIN TSSOP
MAX3237E
SSOP/
SO/
TSSOP
QFN
24
MAX3246E
NAME
GND
17
18
— 11, 14
—
—
—
14
EP
11, 20
26
21
9, 16,
32
—
19, 20
EP
V
CC
SHDN
N.C.
MBAUD
R_OUTB
GND
MAX3222E/MAX3232E/MAX3237E/MAX3241E
†
/MAX3246E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
_______________________________________________________________________________________ 9
Detailed Description
Dual Charge-Pump Voltage Converter
The MAX3222E/MAX3232E/MAX3237E/MAX3241E/ MAX3246Es’ internal power supply consists of a regu­lated dual charge pump that provides output voltages of +5.5V (doubling charge pump) and -5.5V (inverting charge pump) over the +3.0V to +5.5V VCCrange. The charge pump operates in discontinuous mode; if the output voltages are less than 5.5V, the charge pump is enabled, and if the output voltages exceed 5.5V, the charge pump is disabled. Each charge pump requires a flying capacitor (C1, C2) and a reservoir capacitor (C3, C4) to generate the V+ and V- supplies (Figure 1).
RS-232 Transmitters
The transmitters are inverting level translators that con­vert TTL/CMOS-logic levels to ±5V EIA/TIA-232-compli­ant levels.
The MAX3222E/MAX3232E/MAX3237E/MAX3241E/ MAX3246E transmitters guarantee a 250kbps data rate with worst-case loads of 3kΩ in parallel with 1000pF, providing compatibility with PC-to-PC communication software (such as LapLink™). Transmitters can be par­alleled to drive multiple receivers or mice.
The MAX3222E/MAX3237E/MAX3241E/MAX3246E transmitters are disabled and the outputs are forced
into a high-impedance state when the device is in shut­down mode (SHDN = GND). The MAX3222E/ MAX3232E/MAX3237E/MAX3241E/MAX3246E permit the outputs to be driven up to ±12V in shutdown.
The MAX3222E/MAX3232E/MAX3241E/MAX3246E transmitter inputs do not have pullup resistors. Connect unused inputs to GND or V
CC
. The MAX3237E’s trans­mitter inputs have a 400kΩ active positive-feedback resistor, allowing unused inputs to be left unconnected.
MAX3237E MegaBaud Operation
For higher-speed serial communications, the MAX3237E features MegaBaud operation. In MegaBaud operating mode (MBAUD = VCC), the MAX3237E transmitters guarantee a 1Mbps data rate with worst-case loads of 3kΩ in parallel with 250pF for +3.0V < VCC< +4.5V. For +5V ±10% operation, the MAX3237E transmitters guarantee a 1Mbps data rate into worst-case loads of 3kΩ in parallel with 1000pF.
RS-232 Receivers
The receivers convert RS-232 signals to CMOS-logic output levels. The MAX3222E/MAX3237E/MAX3241E/ MAX3246E receivers have inverting three-state outputs. Drive EN high to place the receiver(s) into a high­impedance state. Receivers can be either active or inactive in shutdown (Table 1).
MAX3222E MAX3232E MAX3237E MAX3241E MAX3246E
5kΩ
R_ IN
R_ OUT
C2-
C2+
C1-
C1+
V-
V+
V
CC
C4
C3
C1
C2
0.1µF
V
CC
T_ OUT
T_ IN
GND
7kΩ
150pF
MAX3222E MAX3232E MAX3237E MAX3241E MAX3246E
5kΩ
R_ IN
R_ OUT
C2-
C2+
C1-
C1+
V-
V+
V
CC
C4
C3
C1
C2
0.1µF
V
CC
T_ OUT
T_ IN
GND
3kΩ
1000pF (2500pF, MAX3237E only)
MINIMUM SLEW-RATE TEST CIRCUIT MAXIMUM SLEW-RATE TEST CIRCUIT
Figure 1. Slew-Rate Test Circuits
LapLink is a trademark of Traveling Software.
MAX3222E/MAX3232E/MAX3237E/MAX3241E
†
/MAX3246E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
10 ______________________________________________________________________________________
The complementary outputs on the MAX3237E/ MAX3241E (R_OUTB) are always active, regardless of the state of EN or SHDN. This allows the device to be used for ring indicator applications without forward biasing other devices connected to the receiver outputs. This is ideal for systems where VCCdrops to zero in shutdown to accommodate peripherals such as UARTs (Figure 2).
MAX3222E/MAX3237E/MAX3241E/
MAX3246E Shutdown Mode
Supply current falls to less than 1µA in shutdown mode (SHDN = low). The MAX3237E’s supply current falls to10nA (typ) when all receiver inputs are in the invalid range (-0.3V < R_IN < +0.3). When shut down, the device’s charge pumps are shut off, V+ is pulled down to VCC, V- is pulled to ground, and the transmitter out­puts are disabled (high impedance). The time required to recover from shutdown is typically 100µs, as shown in Figure 3. Connect SHDN to VCCif shutdown mode is not used. SHDN has no effect on R_OUT or R_OUTB (MAX3237E/MAX3241E).
±15kV ESD Protection
As with all Maxim devices, ESD-protection structures are incorporated to protect against electrostatic dis­charges encountered during handling and assembly. The driver outputs and receiver inputs of the MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E have extra protection against static electricity. Maxim’s engineers have developed state-of-the-art structures to protect these pins against ESD of ±15kV without damage. The ESD structures withstand high ESD in all states: normal operation, shutdown, and powered down. After an ESD event, Maxim’s E versions keep working without latchup, whereas competing RS-232 products can latch and must be powered down to remove latchup.
Furthermore, the MAX3237E logic I/O pins also have ±15kV ESD protection. Protecting the logic I/O pins to ±15kV makes the MAX3237E ideal for data cable applications.
T1OUT
R1OUTB
Tx
5kΩ
UART
V
CC
T1IN
LOGIC
TRANSITION
DETECTOR
R1IN
R1OUT
THREE-STATED
EN = V
CC
SHDN = GND
V
CC
TO
µP
Rx
PREVIOUS
RS-232
Tx
UART
PROTECTION
DIODE
PROTECTION
DIODE
SHDN = GND
V
CC
V
CC
GND
Rx
5kΩ
a) OLDER RS-232: POWERED-DOWN UART DRAWS CURRENT FROM A ACTIVE RECEIVER OUTPUT IN SHUTDOWN.
b) NEW MAX3237E/MAX3241E: EN SHUTS DOWN RECEIVER OUTPUTS B (EXCEPT FOR B OUTPUTS), SO NO CURRENT FLOWS TO UART IN SHUTDOWN. B B OUTPUTS INDICATE RECEIVER ACTIVITY DURING SHUTDOWN WITH EN HIGH.
GND
MAX3237E/MAX3241E
Figure 2. Detection of RS-232 Activity when the UART and Interface are Shut Down; Comparison of MAX3237E/MAX3241E (b) with Previous Transceivers (a)
40µs/div
SHDN
T2OUT
T1OUT
5V/div
0
2V/div
0
VCC = 3.3V C1–C4 = 0.1µF
Figure 3. Transmitter Outputs Recovering from Shutdown or Powering Up
MAX3222E/MAX3232E/MAX3237E/MAX3241E
†
/MAX3246E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
______________________________________________________________________________________ 11
ESD protection can be tested in various ways; the transmitter outputs and receiver inputs for the MAX3222E/MAX3232E/MAX3241E/MAX3246E are characterized for protection to the following limits:
•±15kV using the Human Body Model
•±8kV using the Contact Discharge method specified
in IEC 1000-4-2
•±9kV (MAX3246E only) using the Contact Discharge
method specified in IEC 1000-4-2
•±15kV using the Air-Gap Discharge method speci-
fied in IEC 1000-4-2
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE CAPACITOR
C
s
100pF
R
C
1MΩ
R
D
1500Ω
HIGH-
VOLTAGE
DC
SOURCE
DEVICE­UNDER-
TEST
Figure 4a. Human Body ESD Test Model
IP 100%
90%
36.8%
t
RL
TIME
t
DL
CURRENT WAVEFORM
PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE)
I
r
10%
0
0
AMPERES
Figure 4b. Human Body Model Current Waveform
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE RESISTANCE
STORAGE CAPACITOR
C
s
150pF
R
C
50MΩ to 100MΩ
RD
330Ω
HIGH-
VOLTAGE
DC
SOURCE
DEVICE­UNDER-
TEST
Figure 5a. IEC 1000-4-2 ESD Test Model
tr = 0.7ns to 1ns
30ns
60ns
t
100%
90%
10%
I
PEAK
I
Figure 5b. IEC 1000-4-2 ESD Generator Current Waveform
Table 1. MAX3222E/MAX3237E/MAX3241E/ MAX3246E Shutdown and Enable Control Truth Table
SHDN
EN
T_OUT R_OUT
R_OUTB
(MAX3237E/
MAX3241E)
0
High
Active Active
0
High
High
Active
1
Active Active Active
1
Active
High
Active
0
impedance
1
impedance
0
1
impedance
impedance
MAX3222E/MAX3232E/MAX3237E/MAX3241E
†
/MAX3246E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
12 ______________________________________________________________________________________
For the MAX3237E, all logic and RS-232 I/O pins are characterized for protection to ±15kV per the Human Body Model.
ESD Test Conditions
ESD performance depends on a variety of conditions. Contact Maxim for a reliability report that documents test setup, test methodology, and test results.
Human Body Model
Figure 4a shows the Human Body Model, and Figure 4b shows the current waveform it generates when dis­charged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest, which is then discharged into the test device through a
1.5kΩ resistor.
IEC 1000-4-2
The IEC 1000-4-2 standard covers ESD testing and performance of finished equipment; it does not specifi­cally refer to integrated circuits. The MAX3222E/ MAX3232E/MAX3237E/MAX3241E/MAX3246E help you design equipment that meets level 4 (the highest level) of IEC 1000-4-2, without the need for additional ESD­protection components.
The major difference between tests done using the Human Body Model and IEC 1000-4-2 is higher peak current in IEC 1000-4-2, because series resistance is lower in the IEC 1000-4-2 model. Hence, the ESD with­stand voltage measured to IEC 1000-4-2 is generally lower than that measured using the Human Body Model. Figure 5a shows the IEC 1000-4-2 model, and Figure 5b shows the current waveform for the ±8kV IEC 1000-4-2 level 4 ESD Contact Discharge test. The Air­Gap Discharge test involves approaching the device with a charged probe. The Contact Discharge method connects the probe to the device before the probe is energized.
Machine Model
The Machine Model for ESD tests all pins using a 200pF storage capacitor and zero discharge resis­tance. Its objective is to emulate the stress caused by contact that occurs with handling and assembly during manufacturing. All pins require this protection during manufacturing, not just RS-232 inputs and outputs. Therefore, after PC board assembly, the Machine Model is less relevant to I/O ports.
Table 2. Required Minimum Capacitor Values
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
0 12345678910
MAX3222E-fig06a
LOAD CURRENT PER TRANSMITTER (mA)
TRANSMITTER OUTPUT VOLTAGE (V)
V
OUT+
V
OUT-
V
OUT+
V
OUT-
V
CC
VCC = 3.0V
Figure 6a. MAX3241E Transmitter Output Voltage vs. Load Current Per Transmitter
Table 3. Logic-Family Compatibility with Various Supply Voltages
VCC
(V)
C1
(µF)
C2, C3, C4
(µF)
MAX3222E/MAX3232E/MAX3241E
3.0 to 3.6 0.1 0.1
4.5 to 5.5 0.047 0.33
3.0 to 5.5 0.1 0.47
MAX3237E/MAX3246E
3.0 to 3.6 0.22 0.22
3.15 to 3.6 0.1 0.1
4.5 to 5.5 0.047 0.33
3.0 to 5.5 0.22 1.0
SYSTEM
POWER-SUPPLY
VOLTAGE
(V)
3.3 3.3
55
5 3.3
SUPPLY
V
CC
VOLTAGE
(V)
COMPATIBILITY
Compatible with all CMOS families
Compatible with all TTL and CMOS families
C om p ati b l e w i th AC T and H C T C M OS , and w i th AC , H C , or C D 4000 C M O S
MAX3222E/MAX3232E/MAX3237E/MAX3241E
†
/MAX3246E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
______________________________________________________________________________________ 13
Applications Information
Capacitor Selection
The capacitor type used for C1–C4 is not critical for proper operation; polarized or nonpolarized capacitors can be used. The charge pump requires 0.1µF capaci­tors for 3.3V operation. For other supply voltages, see Table 2 for required capacitor values. Do not use val­ues smaller than those listed in Table 2. Increasing the capacitor values (e.g., by a factor of 2) reduces ripple on the transmitter outputs and slightly reduces power consumption. C2, C3, and C4 can be increased without changing C1’s value. However, do not increase C1
without also increasing the values of C2, C3, C4, and C
BYPASS
to maintain the proper ratios (C1 to
the other capacitors).
When using the minimum required capacitor values, make sure the capacitor value does not degrade
excessively with temperature. If in doubt, use capaci­tors with a larger nominal value. The capacitor’s equiv­alent series resistance (ESR), which usually rises at low temperatures, influences the amount of ripple on V+ and V-.
Power-Supply Decoupling
In most circumstances, a 0.1µF VCCbypass capacitor is adequate. In applications sensitive to power-supply noise, use a capacitor of the same value as charge­pump capacitor C1. Connect bypass capacitors as close to the IC as possible.
Operation Down to 2.7V
Transmitter outputs meet EIA/TIA-562 levels of ±3.7V with supply voltages as low as 2.7V.
MAX3241E
EN
23
R5OUT
15
R4OUT
16
R3OUT
17
R2OUT
18
R1OUT
19
R2OUTB
20
R1OUTB
21
5kΩ
5kΩ
5kΩ
5kΩ
5kΩ
R5IN 8
V
CC
R4IN
7
6
R2IN 5
R1IN 4
SHDN
22
GND
25
T3IN
12
T2IN
13
T1IN
14
C2-
2
C2+
1
C1-
24
C1+
28
T3OUT
11
+V
COMPUTER SERIAL PORT
+V
-V
GND
Tx
T2OUT
10
T1OUT
9
V-
3
V+
27
V
CC
V
CC
C4
C3 C1
C2
C
BYPASS
V
CC
= +3.0V TO +5.5V
26
R3IN
MOUSE
Figure 6b. Mouse Driver Test Circuit
MAX3222E/MAX3232E/MAX3237E/MAX3241E
†
/MAX3246E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
14 ______________________________________________________________________________________
Figure 7. Loopback Test Circuit
2µs/div
T1IN
T1OUT
R1OUT
5V/div
5V/div
5V/div
VCC = 3.3V C1–C4 = 0.1µF
Figure 8. MAX3241E Loopback Test Result at 120kbps
2µs/div
T1IN
T1OUT
R1OUT
5V/div
5V/div
5V/div
VCC = 3.3V, C1–C4 = 0.1µF
Figure 9. MAX3241E Loopback Test Result at 250kbps
+5V
0
+5V
0
-5V
+5V
0
T_IN
T_OUT 5kΩ + 250pF
R_OUT
400ns/div
VCC = 3.3V C1–C4 = 0.1µF
Figure 10. MAX3237E Loopback Test Result at 1000kbps (MBAUD = V
CC
)
MAX3222E MAX3232E MAX3237E MAX3241E MAX3246E
5kΩ
R_ IN
R_ OUT
C2-
C2+
C1-
C1+
V-
V+
V
CC
C4
C3
C1
C2
0.1µF
V
CC
T_ OUT
T_ IN
GND
1000pF
Transmitter Outputs Recovering
from Shutdown
Figure 3 shows two transmitter outputs recovering from shutdown mode. As they become active, the two trans­mitter outputs are shown going to opposite RS-232 levels (one transmitter input is high; the other is low). Each transmitter is loaded with 3kΩ in parallel with 2500pF. The transmitter outputs display no ringing or undesir­able transients as they come out of shutdown. Note that
the transmitters are enabled only when the magnitude of V- exceeds approximately -3.0V.
Mouse Drivability
The MAX3241E is designed to power serial mice while operating from low-voltage power supplies. It has been tested with leading mouse brands from manu­facturers such as Microsoft and Logitech. The MAX3241E successfully drove all serial mice tested and met their current and voltage requirements.
MAX3222E/MAX3232E/MAX3237E/MAX3241E
†
/MAX3246E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
______________________________________________________________________________________ 15
Figure 6a shows the transmitter output voltages under increasing load current at +3.0V. Figure 6b shows a typical mouse connection using the MAX3241E.
High Data Rates
The MAX3222E/MAX3232E/MAX3237E/MAX3241E/ MAX3246E maintain the RS-232 ±5V minimum transmit­ter output voltage even at high data rates. Figure 7 shows a transmitter loopback test circuit. Figure 8 shows a loopback test result at 120kbps, and Figure 9 shows the same test at 250kbps. For Figure 8, all trans­mitters were driven simultaneously at 120kbps into RS­232 loads in parallel with 1000pF. For Figure 9, a single transmitter was driven at 250kbps, and all transmitters were loaded with an RS-232 receiver in parallel with 1000pF.
The MAX3237E maintains the RS-232 ±5.0V minimum transmitter output voltage at data rates up to 1Mbps. Figure 10 shows a loopback test result at 1Mbps with MBAUD = VCC. For Figure 10, all transmitters were loaded with an RS-232 receiver in parallel with 250pF.
Interconnection with 3V and 5V Logic
The MAX3222E/MAX3232E/MAX3237E/MAX3241E/ MAX3246E can directly interface with various 5V logic families, including ACT and HCT CMOS. See Table 3 for more information on possible combinations of inter­connections.
UCSP Reliability
The UCSP represents a unique packaging form factor that may not perform equally to a packaged product through traditional mechanical reliability tests. UCSP reliability is integrally linked to the user’s assembly methods, circuit board material, and usage environ­ment. The user should closely review these areas when considering use of a UCSP package. Performance through Operating Life Test and Moisture Resistance remains uncompromised as the wafer-fabrication process primarily determines it.
Mechanical stress performance is a greater considera­tion for a UCSP package. UCSPs are attached through direct solder contact to the user’s PC board, foregoing the inherent stress relief of a packaged product lead frame. Solder joint contact integrity must be consid­ered. Table 4 shows the testing done to characterize the UCSP reliability performance. In conclusion, the UCSP is capable of performing reliably through envi­ronmental stresses as indicated by the results in the table. Additional usage data and recommendations are detailed in the UCSP application note, which can be found on Maxim’s website at www.maxim-ic.com.
Table 4. Reliability Test Data
TEST CONDITIONS DURATION
FAILURES PER
SAMPLE SIZE
Temperature Cycle
T
A
= -35°C to +85°C,
T
A
= -40°C to +100°C
150 cycles,
900 cycles
0/10,
0/200
Operating Life TA = +70°C 240 hours 0/10
Moisture Resistance TA = +20°C to +60°C, 90% RH 240 hours 0/10
Low-Temperature Storage TA = -20°C 240 hours 0/10
Low-Temperature Operational TA = -10°C 24 hours 0/10
Solderability 8-hour steam age — 0/15
ESD ±15kV, Human Body Model — 0/5
High-Temperature Operating Life
T
J
= +150°C 168 hours 0/45
MAX3222E/MAX3232E/MAX3237E/MAX3241E
†
/MAX3246E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
16 ______________________________________________________________________________________
__________________________________________________________Pin Configurations
20
19
18
17
16
15
14
13
1
2
3
8
12
11
10
4
5
6
7
SHDN
V
CC
GND
T1OUT
C1-
V+
C1+
EN
R1IN
R1OUT
T1IN
T2IN
T2OUT
V-
C2-
C2+
9
R2IN
R2OUT
TSSOP/SSOP
N.C.
N.C.
MAX3222E
20
19
18
17
16
15
14
13
1
2
3
8
12
11
10
4
5
6
7
N.C.
V
CC
GND
T1OUT
C1-
V+
C1+
N.C.
R1IN
R1OUT
T2IN
R2OUT
T2OUT
V-
C2-
C2+
9
R2IN
N.C.
TSSOP
T1IN
N.C.
MAX3232E
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
V
CC
GND
T1OUT
R1INC2+
C1-
V+
C1+
MAX3232E
R1OUT
T1IN
T2IN
R2OUTR2IN
T2OUT
V-
C2-
SO/DIP/SSOP/TSSOP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
C1+
V+
V
CC
GND
C1-
EN
R5OUT
SHDN
R1OUTB
R2OUTB
R1OUT
R2OUT
R3OUT
R4OUT
T1IN
T2IN
T3IN
T3OUT
T2OUT
T1OUT
R5IN
R4IN
R3IN
R2IN
R1IN
V-
C2-
C2+
SSOP/SO/TSSOP
QFN
MAX3241E
TOP VIEW
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
C1+
V+
V
CC
C1-
T1IN
T2IN
MBAUD
T3IN
R1OUT
R2OUT
T4IN
R3OUT
T5IN
R1OUTB
SHDN
EN
T5OUT
R3IN
T4OUT
R2IN
R1IN
T3OUT
T2OUT
T1OUT
V-
C2-
GND
C2+
SSOP
MAX3237E
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
SHDN
V
CC
GND
T1OUT
C1-
V+
C1+
EN
R1IN
R1OUT
T1IN
T2IN
T2OUT
V-
C2-
C2+
10
9
R2OUTR2IN
SO/DIP
MAX3222E
32
31
30
29
28
27
26
N.C.
V-
C2-
C2+
C1+
V+
V
CC
25 N.C.
9
10
11
12
13
14
15
N.C.
T3IN
T2IN
T1IN
R5OUT
R4OUT
R3OUT
16N.C.
17
18
19
20
21
22
23
R2OUT
R1OUT
R2OUTB
R1OUTB
SHDN
EN
C1-
8
7
6
5
4
3
2
T3OUT
T2OUT
T1OUT
R5IN
R4IN
R3IN
R2IN
MAX3241E
1R1IN
24 GND
TOP VIEW
MAX3222E/MAX3232E/MAX3237E/MAX3241E
†
/MAX3246E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
______________________________________________________________________________________ 17
Pin Configurations (continued)
19
20
18
17
7
6
8
C1-
C2-
V-
9
C1+
R1IN
N.C.
T1IN
T1OUT
12
SHDN
45
15 14 12 11
EN
V+
EXPOSED PADDLE
EXPOSED PADDLE
N.C.
R2OUT
R2IN
T2OUT
MAX3222E
C2+
R1OUT
3
13
V
CC
16
10
T2IN
GND
TQFN
TOP VIEW
15
16
14
13
6
5
7
C2+
V-
8
C1-
R1IN
T1IN
T1OUT
12
V
CC
4
12 11 9
V+
C1+
T2IN
R2OUT
R2IN
T2OUT
MAX3232E
C2- R1OUT
3
10
GND
TQFN
TOP VIEW
B2: SHDN C2: R1OUT D2: T3IN
E2: T2IN B3: EN
E3: T1IN BUMPS B4, B5, C3, C4,
C5, D3, D4, D5, E4, AND E5 NOT POPULATED
TOP VIEW (BUMPS ON BOTTOM)
R3OUT
R2OUT
V-
C2-
A1
A2 A3 A4 A5 A6
B1
B2
C2
C1
MAX3246E
D2
D1
R2INR1INR5OUTR4OUT
R3IN
R4IN
B6B3
C6
R5IN
T3OUT
D6
C2+
E2
E1
F1
V+
CC
E6E3
T2OUT
F6F5F4F3F2
T1OUT
GNDC1-C1+V
UCSP
MAX3222E/MAX3232E/MAX3237E/MAX3241E
†
/MAX3246E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
18 ______________________________________________________________________________________
__________________________________________________Typical Operating Circuits
R2OUT10
1
R1OUT13
R2IN
9
18
GND
16
RS-232 OUTPUTS
TTL/CMOS
INPUTS
T2IN
11
T1IN
12
C2-
6
C2+
5
C1-
4
C1+
2
R1IN
14
T2OUT
8
T1OUT
15
V-
7
V+
3
V
CC
17
C1
0.1µF
C2
0.1µF
C
BYPASS
+3.3V
RS-232 INPUTS
TTL/CMOS
OUTPUTS
5kΩ
5kΩ
EN
SHDN
C3*
0.1µF
C4
0.1µF
NOTE: PIN NUMBERS REFER TO SO/DIP PACKAGES. MAX3222E PINOUT REFERS TO SO/DIP PACKAGES. MAX3232E PINOUT REFERS TO TSSOP/SSOP/SO/DIP/ PACKAGES
*C3 CAN BE RETURNED TO EITHER V
CC
OR GROUND.
R2OUT9
R1OUT12
R2IN
8
GND
15
RS-232 OUTPUTS
TTL/CMOS
INPUTS
T2IN
10
T1IN
11
C2-
5
C2+
4
C1-
3
C1+
1
R1IN
13
T2OUT
7
T1OUT
14
V-
6
V+
2
V
CC
C4
0.1µF
16
C1
0.1µF
C2
0.1µF
C
BYPASS
+3.3V
RS-232 INPUTS
TTL/CMOS
OUTPUTS
C3*
0.1µF
5kΩ
5kΩ
SEE TABLE 2 FOR CAPACITOR SELECTION.
MAX3222E
MAX3232E
MAX3222E/MAX3232E/MAX3237E/MAX3241E
†
/MAX3246E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
______________________________________________________________________________________ 19
_____________________________________Typical Operating Circuits (continued)
EN
23
R5OUT
15
R4OUT
16
R3OUT
17
R2OUT
18
R1OUT
19
R2OUTB
20
R1OUTB
21
TTL/CMOS
OUTPUTS
5kΩ
5kΩ
5kΩ
5kΩ
5kΩ
R5IN 8
*C3 CAN BE RETURNED TO EITHER V
CC
OR GROUND.
R4IN
7
R3IN
6
R2IN 5
R1IN
4
RS-232 INPUTS
SHDN
22
GND
25
RS-232 OUTPUTS
TTL/CMOS
INPUTS
T3IN
12
T2IN
13
T1IN
14
C2-
2
C2+
1
C1-
24
C1+
28
T3OUT
11
T2OUT 10
T1OUT 9
V-
3
V+
27
V
CC
C4
0.1µF
C3
*
0.1µF
C1
0.1µF
C2
0.1µF
26
+3.3V
C
BYPASS
MAX3241E
EN
13
R3OUT
18
R2OUT
20
R1OUT
21
R1OUTB
16
LOGIC
OUTPUTS
5kΩ
5kΩ
5kΩ
R3IN
11
R2IN 9
R1IN
8
RS-232 INPUTS
GND
2
RS-232 OUTPUTS
LOGIC
INPUTS
T3IN
22
T2IN
23
T1IN
24
C2-
3
C2+
1
C1-
25
C1+
28
T3OUT
7
T2OUT 6
T1OUT 5
T1
T2
T3
R1
R2
R3
V-
4
V+
27
V
CC
0.1µF
0.1µF
0.1µF
0.1µF
26
MBAUD
15
T5IN
17
T4IN
19
T5OUT
12
T4OUT 10
SHDN
14
T4
T5
C3*
C
BYPASS
+3.3V
MAX3237E
MAX3222E/MAX3232E/MAX3237E/MAX3241E
†
/MAX3246E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
20 ______________________________________________________________________________________
_____________________________________Typical Operating Circuits (continued)
EN
B3
R5OUT
A3
R4OUT
A2
R3OUT
A1
R2OUT
B1
R1OUT
C2
TTL/CMOS
OUTPUTS
5kΩ
5kΩ
5kΩ
5kΩ
5kΩ
R5IN C6
*C3 CAN BE RETURNED TO EITHER V
CC
OR GROUND.
R4IN
B6
R3IN
A6
R2IN A5
R1IN
A4
RS-232 INPUTS
SHDN
B2
GND
F5
RS-232 OUTPUTS
TTL/CMOS
INPUTS
T3IN
D2
T2INE2
T1IN
E3
C2-
D1
C2+
E1
C1-
F4
C1+
F3
T3OUT
D6
T2OUT E6
T1OUT F6
V-
C1
V+
F1
V
CC
C4
0.1µF
C3
*
0.1µF
C1
0.1µF
C2
0.1µF
F2
+3.3V
C
BYPASS
MAX3246E
MAX3222E/MAX3232E/MAX3237E/MAX3241E
†
/MAX3246E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
______________________________________________________________________________________ 21
Selector Guide
PART
NO. OF
LOW-POWER
GUARANTEED
DATA RATE
(bps)
MAX3222E 2/2 ✔ 250k
MAX3232E 2/2 — 250k
MAX3237E (Normal)
5/3 ✔ 250k
MAX3237E
(MegaBaud)
5/3 ✔ 1M
MAX3241E 3/5 ✔ 250k
MAX3246E 3/5 ✔ 250k
___________________ Chip Information
TRANSISTOR COUNT:
MAX3222E/MAX3232E: 1129
MAX3237E: 2110
MAX3241E: 1335
MAX3246E: 842
PROCESS: BICMOS
Ordering Information (continued)
PART
TEMP RANGE
PIN­PACKAGE
PKG
CODE
MAX3232ECTE
16 Thin QFN­EP** (5mm x 5mm)
T1655-2
MAX3232ECUE
16 TSSOP —
MAX3232ECUP
20 TSSOP —
MAX3232EEAE
16 SSOP —
MAX3232EEWE
16 Wide SO —
MAX3232EEPE
—
MAX3232EETE
16 Thin QFN­EP** (5mm x 5mm)
T1655-2
MAX3232EEUE
16 TSSOP —
MAX3232EEUP
20 TSSOP —
MAX3237ECAI
28 SSOP —
MAX3237EEAI
28 SSOP —
MAX3241ECAI
28 SSOP —
MAX3241ECWI
28 Wide SO —
MAX3241ECUI
28 TSSOP —
MAX3241ECTJ
32 Thin QFN —
MAX3241EEAI
28 SSOP —
MAX3241EEWI
28 Wide SO —
MAX3241EEUI
28 TSSOP —
MAX3246ECBX-T
6 x 6 UCSP
†
—
MAX3246EEBX-T
6 x 6 UCSP
†
—
†Requires solder temperature profile described in the Absolute
Maximum Ratings section. UCSP Reliability is integrally linked to the user’s assembly methods, circuit board material, and environment. Refer to the UCSP Reliability Notice in the UCSP Reliability section of this datasheet for more information.
**EP = Exposed paddle.
DRIVERS/
RECEIVERS
SHUTDOWN
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C 16 Plastic DIP
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
24L QFN THIN.EPS
PACKAGE OUTLINE,
21-0139
2
1
E
12, 16, 20, 24, 28L THIN QFN, 4x4x0.8mm
PACKAGE OUTLINE,
21-0139
2
2
E
12, 16, 20, 24, 28L THIN QFN, 4x4x0.8mm
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages
.)
MAX3222E/MAX3232E/MAX3237E/MAX3241E
†
/MAX3246E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
22 ______________________________________________________________________________________
MAX3222E/MAX3232E/MAX3237E/MAX3241E
†
/MAX3246E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
______________________________________________________________________________________ 23
TSSOP4.40mm.EPS
PACKAGE OUTLINE, TSSOP 4.40mm BODY
21-0066
1
1
I
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages
.)
MAX3222E/MAX3232E/MAX3237E/MAX3241E
†
/MAX3246E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
24 ______________________________________________________________________________________
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages
.)
36L,UCSP.EPS
PACKAGE OUTLINE, 6x6 UCSP
21-0082
1
K
1
MAX3222E/MAX3232E/MAX3237E/MAX3241E
†
/MAX3246E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
______________________________________________________________________________________ 25
SOICW.EPS
PACKAGE OUTLINE, .300" SOIC
1
1
21-0042
B
REV.DOCUMENT CONTROL NO.APPROVAL
PROPRIETARY INFORMATION
TITLE:
TOP VIEW
FRONT VIEW
MAX
0.012
0.104
0.019
0.299
0.013
INCHES
0.291
0.009
E
C
DIM
0.014
0.004
B
A1
MIN
0.093A
0.23
7.40 7.60
0.32
MILLIMETERS
0.10
0.35
2.35
MIN
0.49
0.30
MAX
2.65
0.050
0.016L
0.40 1.27
0.5120.496D
D
MINDIM
D
INCHES
MAX
12.60 13.00
MILLIMETERS
MIN
MAX
20
AC
0.447 0.463 AB11.7511.35 18
0.398 0.413 AA10.5010.10 16
N MS013
SIDE VIEW
H 0.4190.394 10.00 10.65
e 0.050 1.27
D 0.6140.598 15.20 2415.60 AD D 0.7130.697 17.70 2818.10 AE
H
E
N
D
A1
B
e
A
0∞-8∞
C
L
1
VARIATIONS:
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages
.)
SSOP.EPS
PACKAGE OUTLINE, SSOP, 5.3 MM
1
1
21-0056
C
REV.DOCUMENT CONTROL NO.APPROVAL
PROPRIETARY INFORMATION
TITLE:
NOTES:
1. D&E DO NOT INCLUDE MOLD FLASH.
2. MOLD FLASH OR PROTRUSIONS NOT TO EXCEED .15 MM (.006").
3. CONTROLLING DIMENSION: MILLIMETERS.
4. MEETS JEDEC MO150.
5. LEADS TO BE COPLANAR WITHIN 0.10 MM.
7.90
H
L
0∞
0.301
0.025
8∞
0.311
0.037
0∞
7.65
0.63
8∞
0.95
MAX
5.38
MILLIMETERS
B
C
D
E
e
A1
DIM
A
SEE VARIATIONS
0.0256 BSC
0.010
0.004
0.205
0.002
0.015
0.008
0.212
0.008
INCHES
MIN
MAX
0.078
0.65 BSC
0.25
0.09
5.20
0.05
0.38
0.20
0.21
MIN
1.73 1.99
MILLIMETERS
6.07
6.07
10.07
8.07
7.07
INCHES
D D
D
D
D
0.239
0.239
0.397
0.317
0.278
MIN
0.249
0.249
0.407
0.328
0.289
MAX
MIN
6.33
6.33
10.33
8.33
7.33
14L 16L
28L
24L
20L
MAX
N
A
D
e
A1
L
C
HE
N
12
B
0.068
MAX3222E/MAX3232E/MAX3237E/MAX3241E
†
/MAX3246E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers
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.
26 ____________________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 (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages
.)
PDIPN.EPS
Revision History
Pages changed at Rev 10: 1–4, 9, 11, 21, 22, 26
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