MAXIM MAX3222E, MAX3232E, MAX3237E, MAX3241E User Manual

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________________General Description

The MAX3222E/MAX3232E/MAX3237E/MAX3241E are
3V-powered EIA/TIA-232 and V.28/V.24 communications
interfaces with low power requirements, high data­rate capabilities, and enhanced electrostatic discharge
(ESD) protection. All transmitter outputs and receiver
inputs are protected to ±15kV using IEC 1000-4-2 Air­Gap Discharge, ±8kV using IEC 1000-4-2 Contact Dis­charge, and ±15kV using the Human Body Model. The
MAX3237E’s logic and receiver I/O pins are protected to
the above standards, while the transmitter output pins are
protected to ±15kV using the Human Body Model.

The transceivers have a proprietary low-dropout transmit­ter output stage, delivering true RS-232 performance from
a +3.0V to +5.5V supply with a dual charge pump. The
charge pump requires only four small 0.1µF capacitors
for operation from a +3.3V supply. Each device is guaran­teed to run at data rates of 250kbps while maintaining RS­232 output levels. The MAX3237E is guaranteed to run at
data rates of 250kbps in the normal operating mode and
1Mbps in the MegaBaud™ operating mode while main­taining RS-232-compliant output levels.

The MAX3222E/MAX3232E have two receivers and two
drivers. The MAX3222E features a 1µA shutdown mode
that reduces power consumption and extends battery
life in portable systems. Its receivers can remain active
in shutdown mode, allowing external devices such as
modems to be monitored using only 1µA supply current.
Both the MAX3222E and MAX3232E are pin, package,
and functionally compatible with the industry-standard
MAX242 and MAX232, respectively.

The MAX3241E is a complete serial port (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.
Both devices feature a shutdown mode in which all
receivers can remain active while using a supply cur­rent of only 1µA (MAX3241E) or 10nA (MAX3237E). The
MAX3237E/MAX3241E have additional receiver outputs
that always remain active.

The MAX3222E and MAX3232E are available in space­saving SO, SSOP, and TSSOP packages. The MAX3241E
is available in SO and SSOP packages. The MAX3237E is
available in an SSOP package.

________________________Applications

Notebooks, Subnotebooks, Smart Phones
and Palmtop Computers

XDSL Modems
Battery-Powered Equipment Printers
Cell-Phone Data Cables Cell Phones

____________________________Features

♦ ESD Protection for RS-232 I/O Pins

(MAX3222E/MAX3232E/MAX3241E)

±15kV—Human Body Model
±8kV—IEC 1000-4-2, Contact Discharge
±15kV—IEC 1000-4-2, Air-Gap Discharge

♦ ESD Protection for All Logic and Receiver I/O

Pins (MAX3237E)

±15kV—Human Body Model
±8kV—IEC 1000-4-2, Contact Discharge
±15kV—IEC 1000-4-2, Air-Gap Discharge

♦ ESD Protection for Transmitter Output Pins

(MAX3237E)

±15kV—Human Body Model

♦ Guaranteed Data Rate

250kbps (MAX3222E/MAX3232E/MAX3241E
and MAX3237E, normal operation)

1Mbps (MAX3237E, MegaBaud operation)

♦ Latchup Free
♦ Low-Power Shutdown with Receivers Active

1µA (MAX3222E/MAX3241E)
10nA (MAX3237E)

♦ Flow-Through Pinout (MAX3237E)
♦ Guaranteed Mouse Driveability (MAX3241E)
♦ Meets EIA/TIA-232 Specifications Down to 3.0V

MAX3222E/MAX3232E/MAX3237E/MAX3241E

†

±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 3a; 1/00

_______________Ordering Information

Ordering Information continued at end of data sheet.

___________________________Selector Guide

Typical Operating Circuits appear at end of data sheet.

Pin Configurations appear at end of data sheet.

†

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.

MegaBaud is a trademark of Maxim Integrated Products.

For free samples and the latest literature, visit www.maxim-ic.com or phone [phone].
For small orders, phone [phone].

PART

MAX3222E

MAX3232E

MAX3237E

(Normal)

MAX3237E

(MegaBaud)

MAX3241E 3/5

5/3

5/3

2/2

2/2

NO. OF

DRIVERS/

RECEIVERS

LOW-

POWER

SHUTDOWN

✔

—

✔

✔

✔

250

1M

250

250

250

GUARANTEED

DATA RATE

(kbps)

MAX3222ECAP

MAX3222ECUP

PART TEMP. RANGE

0°C to +70°C

0°C to +70°C 20 SSOP

20 TSSOP

PIN-PACKAGE

MAX3222E/MAX3232E/MAX3237E/MAX3241E

±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= +3.0V to +5.5V, C1–C4 = 0.1µF, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)

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 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 TSSOP (derate 7.0mW/°C above +70°C) ..........559mW

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

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

Note 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.

VCC= 5.0V

VCC= 3.3V

VCC= 3.3V

VCC= 5.0V

SHDN = VCC, no load

T_IN, EN, SHDN

TA = +25°C

I

OUT

= 1.6mA (MAX3222E/MAX3232E/MAX3241E)

R_OUT (MAX3222E/MAX3237E/MAX3241E), EN = VCC,
receivers disabled

µA

T_IN, EN, SHDN, MBAUD

T_IN, EN, SHDN, MBAUD

I

OUT

= -1.0mA

CONDITIONS

±0.01 ±1

Input Leakage Current

SHDN = GND

µA110

Shutdown Supply Current

V

0.8 1.5

Input Threshold Low

0.6 1.1

V-25 +25Input Voltage Range

V

VCC-VCC-

0.6 0.1

Output Voltage High

mA

0.3 1

Supply Current

V

0.4

Output Voltage Low

µA±0.05 ±10Output Leakage Current

V0.5Transmitter Input Hysteresis

V0.8Input Logic Low

2.0
V

2.4

Input Logic High

UNITSMIN TYP MAXPARAMETER

MAX3222E, MAX3232E,
MAX3241E

MAX3237E 0.5 2.0

SHDN = R_IN = GND, T_IN = GND or V

CC

(MAX3237E)

nA10 300

MAX3222E, MAX3232E,
MAX3241E

T_IN, SHDN, MBAUD

918MAX3237E (Note 3)

I

OUT

= 1.0mA (MAX3237E) 0.4

DC CHARACTERISTICS (VCC= +3.3V or +5.0V, TA= +25°C)

LOGIC INPUTS

RECEIVER OUTPUTS

RECEIVER INPUTS

MAX3222E/MAX3232E/MAX3237E/MAX3241E

±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,

Up to 1Mbps, True RS-232 Transceivers

_______________________________________________________________________________________ 3

Note 2: MAX3222E/MAX3232E/MAX3241E: C1–C4 = 0.1µF tested at 3.3V ±10%; C1 = 0.047µF, C2–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–C4 =

0.33µF tested at 5.0V ±10%.

Note 3: 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 4: Transmitter skew is measured at the transmitter zero crosspoints.

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +3.0V to +5.5V, C1–C4 = 0.1µF, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)

TA = +25°C

IEC 1000-4-2 Contact Discharge (except MAX3237E)

IEC 1000-4-2 Air-Gap Discharge (except MAX3237E)

Human Body Model

TA = +25°C

VCC= 0 or 3V to 5.5V, V

OUT

= ±12V, transmitters disabled

(MAX3222E/MAX3232E/MAX3241E)

T1IN = T2IN = GND, T3IN = VCC, T3OUT loaded with 3kΩ
to GND, T1OUT and T2OUT loaded with 2.5mA each

CONDITIONS

V0.5Input Hysteresis

V

1.5 2.4

Input Threshold High

±8

R_IN, T_OUT

±15

kV

±15

kΩ357Input Resistance

µA±25Output Leakage Current

V±5Transmitter Output Voltage

UNITSMIN TYP MAXPARAMETER

TIMING CHARACTERISTICS—MAX3222E/MAX3232E/MAX3241E

(VCC= +3.0V to +5.5V, C1–C4 = 0.1µF, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)

V

CC

= 0, transmitter output = ±2V Ω300 50kOutput Resistance

TRANSMITTER OUTPUTS

mA±60Output Short-Circuit Current

2.0 2.4

All transmitter outputs loaded with 3kΩ to ground V±5 ±5.4Output Voltage Swing

VCC= 3.3V

VCC= 5.0V

MAX3237E

±8

T_IN, R_IN, R_OUT, EN, SHDN,
MBAUD

±15

kV

±15

RECEIVER INPUTS

MOUSE DRIVEABILITY (MAX3241E)

ESD PROTECTION

Human Body Model

IEC 1000-4-2 Air-Gap Discharge

IEC 1000-4-2 Contact Discharge

Transition-Region Slew Rate

430

V/µs

CL= 150pF to
2500pF

CL= 150pF to
1000pF

PARAMETER SYMBOL MIN TYP MAX UNITS

Receiver Skew

t

PHL

- t

PLH



50 ns

Transmitter Skew

t

PHL

- t

PLH



100 ns

Receiver Output Disable Time 200 ns

Receiver Output Enable Time 200 ns

630

Maximum Data Rate 250 kbps

t

PHL

0.15

Receiver Propagation Delay

t

PLH

0.15

µs

CONDITIONS

(Note 4)

Normal operation (except MAX3232E)

Normal operation (except MAX3232E)

VCC= 3.3V,
TA= +25°C,
RL= 3kΩ to 7kΩ,
measured from +3V
to -3V or -3V to +3V

RL= 3kΩ, CL= 1000pF,
one transmitter switching

Receiver input to receiver output,
C

L

= 150pF

__________________________________________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

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

±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers

4 _______________________________________________________________________________________

TIMING CHARACTERISTICS—MAX3237E

(VCC= +3.0V to +5.5V, C1–C4 = 0.1µF, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)

24 150

MBAUD =
V

CC

Transition-Region Slew Rate

VCC= 3.3V, RL= 3kΩ to
7kΩ, +3V to -3V or -3V to
+3V, TA= +25°C

MBAUD =
GND

CL= 150pF
to 1000pF

t

PLH

t

PHL

V/µs

630

Receiver Skew 50 ns

|

t

PHL

- t

PLH

|

Transmitter Skew

100 ns

| t

PHL

- t

PLH

|, MBAUD = V

CC

R_IN to R_OUT, CL= 150pF

Maximum Data Rate

1000

kbps

VCC= 4.5V to 5.5V, RL= 3kΩ, CL= 1000pF,
one transmitter switching, MBAUD = V

CC

1000

VCC= 3.0V to 4.5V, RL= 3kΩ, CL= 250pF,
one transmitter switching, MBAUD = V

CC

PARAMETER MIN TYP MAX UNITS

Receiver Output Enable Time 2.6 µs

Receiver Propagation Delay

0.15

µs

250

0.15

100 ns

| t

PHL

- t

PLH

|, MBAUD = GND

Receiver Output Disable Time 2.4 µsNormal operation

CONDITIONS

Normal operation

RL= 3kΩ, CL= 1000pF, one transmitter switching,
MBAUD = GND

430

CL= 150pF to 2500pF,
MBAUD = GND

MAX3222E/MAX3232E/MAX3237E/MAX3241E

±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,

Up to 1Mbps, True RS-232 Transceivers

_______________________________________________________________________________________ 5

MAX3238E toc01

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.)

-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)

TRANSMITTER OUTPUT VOLTAGE

vs. LOAD CAPACITANCE

6
5
4
3
2

FOR DATA RATES UP TO 250kbps

1

1 TRANSMITTER 250kbps
4 TRANSMITTERS 15.6kbps

0

ALL TRANSMITTERS LOADED

-1

WITH 3kΩ + C

-2

-3

-4

TRANSMITTER OUTPUT VOLTAGE (V)

-5

-6
0 1000 1500500 2000 2500 300

SLEW RATE vs. LOAD CAPACITANCE

70

60

50

40

30

SLEW RATE (V/µs)

20

1 TRANSMITTER AT FULL DATA RATE
4 TRANSMITTERS AT 1/16 DATA RATE

10

3kΩ + C

LOAD EACH OUTPUT

L

0

0

500 1000 1500 2000

LOAD CAPACITANCE (pF)

MAX3237E

SLEW RATE vs. LOAD CAPACITANCE

12

10

8

6

SLEW RATE (V/µs)

4

1 TRANSMITTER AT 250kbps
4 TRANSMITTERS 15.6kbps

2

ALL TRANSMITTERS LOADED
WITH 3kΩ + C

0

0

TRANSMITTER SKEW vs. LOAD CAPACITANCE

100

80

60

40

|t

- t

PLH

TRANSMITTER SKEW (ns)

1 TRANSMITTER AT 500kbps

20

4 TRANSMITTERS AT 1/16 DATA RATE
ALL TRANSMITTERS LOADED
WITH 3kΩ + C

0

0

L

LOAD CAPACITANCE (pF)

MAX3237E

(MBAUD = V

CC

-SLEW, 1Mbps
+SLEW, 1Mbps

-SLEW, 2Mbps
+SLEW, 2Mbps

)

TRANSMITTER OUTPUT VOLTAGE

1Mbps

1.5Mbps

1.5Mbps

1Mbps

CC

)

MAX3237E toc08

vs. LOAD CAPACITANCE (MBAUD = V

7.5

V

+

OUT

V

OUT-

5.0

2.5
1 TRANSMITTER AT FULL DATA RATE
4 TRANSMITTERS AT 1/16 DATA RATE

0

3kΩ + C

-2.5

-5.0

TRANSMITTER OUTPUT VOLTAGE (V)

-7.5
0

2Mbps

LOAD, EACH OUTPUT

L

2Mbps

500 1000 1500 2000

LOAD CAPACITANCE (pF)

MAX3237E

SUPPLY CURRENT vs. LOAD CAPACITANCE

WHEN TRANSMITTING DATA (MBAUD = GND)

50

MAX3237E toc10

40

30

20

SUPPLY CURRENT (mA)

10

0

250kbps

120kbps

20kbps

1 TRANSMITTER AT 20kbps, 120kbps, 250kbps
4 TRANSMITTERS AT 15.6kbps
ALL TRANSMITTERS LOADED
WITH 3kΩ + C

0

L

1000 1500500 2000 2500 3000

LOAD CAPACITANCE (pF)

MAX3237E toc11

MAX3237E

(MBAUD = GND)

SR-

SR+

L

1000 1500500 2000 2500 3000

LOAD CAPACITANCE (pF)

MAX3237E

(MBAUD = V

|

PHL

L

1000 1500500 2000

LOAD CAPACITANCE (pF)

)

CC

MAX3237E toc09

MAX3237E toc12

______________________________________________________________Pin Description

MAX3222E/MAX3232E/MAX3237E/MAX3241E

±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.)

-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 250kbps
4 TRANSMITTERS 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

-5.5V Generated by the Charge PumpV-4

RS-232 Transmitter OutputsT_OUT

5, 6, 7,

10, 12

RS-232 Receiver InputsR_IN8, 9, 11

TTL/CMOS Receiver OutputsR_OUT18, 20, 21

+5.5V Generated by the Charge PumpV+27

Negative Terminal of Voltage-Doubler
Charge-Pump Capacitor

C1-25

Positive Terminal of Inverting Charge­Pump Capacitor

C2+1

Negative Terminal of Inverting
Charge-Pump Capacitor

C2-3

Positive Terminal of Voltage-Doubler
Charge-Pump Capacitor

C1+28

Receiver Enable. Active low.

EN

13*

FUNCTIONNAME

MAX3237E

TTL/CMOS Transmitter InputsT_IN

17*, 19*, 22*,

23*, 24*

GroundGND2

77

8, 178, 15

9, 169, 14

10, 1510, 13

12, 1311, 12

33

44

55

66

22

11

TSSOP/

SSOP

SO/DIP

MAX3222E

1816

76

8, 177, 14

9, 168, 13

12, 159, 12

13, 1410, 11

32

43

54

65

21

——

TSSOP/

SSOP

SO/DIP

MAX3232E

1815

3

9, 10, 11

4–8

15–19

12, 13, 14

27

24

1

2

28

23

PIN

MAX3241E

25