max3232(2).pdf

19-1298; Rev 3a; 1/00

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

Up to 1Mbps, True RS-232 Transceivers

________________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 data-

rate capabilities, and enhanced electrostatic discharge

(ESD) protection. All transmitter outputs and receiver

inputs are protected to ±15kV using IEC 1000-4-2 Air-

Gap Discharge, ±8kV using IEC 1000-4-2 Contact Dis-

charge, 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 transmit-

ter 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 guaran-

teed to run at data rates of 250kbps while maintaining RS-

232 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 main-

taining 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 com-

puters. 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 cur-

rent 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 space-

saving 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

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

_______________Ordering Information

PART

TEMP. RANGE

0°C to +70°C

PIN-PACKAGE

MAX3222E CUP

20 TSSOP

MAX3222ECAP

20 SSOP

Ordering Information continued at end of data sheet.

___________________________Selector Guide

PART

NO. OF

DRIVERS/

RECEIVERS

LOW-

POWER

SHUTDOWN

—

GUARANTEED

DATA RATE

(kbps)

MAX3222E

MAX3232E

MAX3237E

(Normal)

MAX3237E

(MegaBaud)

MAX3241E

2/2

250

2/2

250

5/3

✔

250

5/3

✔

3/5

✔

250

Cell Phones

Pin Configurations appear at end of data sheet.

Typical Operating Circuits 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.

________________________________________________________________ Maxim Integrated Products 1

For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

____________________________Features

MegaBaud is a trademark of Maxim Integrated Products.

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

Up to 1Mbps, True RS-232 Transceivers

ABSOLUTE MAXIMUM RATINGS

V CC to 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.

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.

ELECTRICAL CHARACTERISTICS

(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.) (Note 2)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

DC CHARACTERISTICS (V CC = +3.3V or +5.0V, T A = +25°C)

Supply Current

SHDN = V CC , no load

MAX3222E, MAX3232E,

MAX3241E

MAX3237E

0.3

0.5

2.0

Shutdown Supply Current

SHDN = GND

µA

SHDN = R_IN = GND, T_IN = GND or V CC (MAX3237E)

300

LOGIC INPUTS

Input Logic Low

T_IN, EN, SHDN, MBAUD

0.8

Input Logic High

T_IN, EN, SHDN, MBAUD

V CC = 3.3V

2.0

V CC = 5.0V

2.4

Transmitter Input Hysteresis

0.5

Input Leakage Current

T_IN, EN, SHDN

MAX3222E, MAX3232E,

MAX3241E

±0.01

±1

µA

T_IN, SHDN, MBAUD

MAX3237E (Note 3)

RECEIVER OUTPUTS

Output Leakage Current

R_OUT (MAX3222E/MAX3237E/MAX3241E), EN = V CC ,

receivers disabled

±0.05

±10

µA

Output Voltage Low

I OUT = 1.6mA (MAX3222E/MAX3232E/MAX3241E)

0.4

I OUT = 1.0mA (MAX3237E)

0.4

Output Voltage High

I OUT = -1.0mA

V CC -

CC -

0.6

0.1

RECEIVER INPUTS

Input Voltage Range

-25

+25

Input Threshold Low

T A = +25°C

V CC = 3.3V

V CC = 5.0V

0.6

1.1

0.8

1.5

2 _______________________________________________________________________________________

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

Up to 1Mbps, True RS-232 Transceivers

ELECTRICAL CHARACTERISTICS (continued)

(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.) (Note 2)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

RECEIVER INPUTS

Input Threshold High

T A = +25°C

V CC = 3.3V

V CC = 5.0V

1.5

2.4

2.0

2.4

Input Hysteresis

0.5

Input Resistance

T A = +25°C

Ω

TRANSMITTER OUTPUTS

Output Voltage Swing

All transmitter outputs loaded with 3k

Ω

to ground

±5

±5.4

Output Resistance

V CC = 0, transmitter output = ±2V

300

50k

Ω

Output Short-Circuit Current

±60

Output Leakage Current

V CC = 0 or 3V to 5.5V, V OUT = ±12V, transmitters disabled

(MAX3222E/MAX3232E/MAX3241E)

±25

µA

MOUSE DRIVEABILITY (MAX3241E)

Transmitter Output Voltage

T1IN = T2IN = GND, T3IN = V CC , T3OUT loaded with 3k

Ω

±5

to GND, T1OUT and T2OUT loaded with 2.5mA each

ESD PROTECTION

Human Body Model

±15

R_IN, T_OUT

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

±15

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

±8

Human Body Model

IEC 1000-4-2 Air-Gap Discharge

IEC 1000-4-2 Contact Discharge

±15

T_IN, R_IN, R_OUT, EN, SHDN,

MBAUD

MAX3237E

±15

±8

TIMING CHARACTERISTICS—MAX3222E/MAX3232E/MAX3241E

(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.) (Note 2)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX UNITS

Maximum Data Rate

R L = 3k Ω , C L = 1000pF,

one transmitter switching

Receiver input to receiver output,

C L = 150pF

250

kbps

Receiver Propagation Delay

t PHL

0.15

µs

t PLH

0.15

Receiver Output Enable Time

Normal operation (except MAX3232E)

200

Receiver Output Disable Time

Normal operation (except MAX3232E)

200

Transmitter Skew

t PHL - t PLH

(Note 4)

100

Receiver Skew

t PHL - t PLH

V CC = 3.3V,

T A = +25°C,

R L = 3k Ω to 7k Ω ,

measured from +3V

to -3V or -3V to +3V

C L = 150pF to

1000pF

Transition-Region Slew Rate

V/µs

C L = 150pF to

2500pF

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.

_______________________________________________________________________________________ 3

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

Up to 1Mbps, True RS-232 Transceivers

TIMING CHARACTERISTICS—MAX3237E

(V CC = +3.0V to +5.5V, C1–C4 = 0.1µF, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.) (Note 2)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

, C L = 1000pF, one transmitter switching,

MBAUD = GND

Ω

250

Maximum Data Rate

, C L = 250pF,

one transmitter switching, MBAUD = V CC

Ω

1000

kbps

, C L = 1000pF,

one transmitter switching, MBAUD = V CC

Ω

1000

Receiver Propagation Delay

R_IN to R_OUT, C L = 150pF

t PHL

0.15

µs

t PLH

0.15

Receiver Output Enable Time

Normal operation

2.6

µs

Receiver Output Disable Time

Normal operation

2.4

µs

Transmitter Skew

| t PHL - t PLH | , MBAUD = GND

100

| t PHL - t PLH | , MBAUD = V CC

100

Receiver Skew

| t PHL - t PLH |

C L = 150pF

to 1000pF

MBAUD =

GND

V CC = 3.3V, R L = 3k

Ω

MBAUD =

V CC

Transition-Region Slew Rate

, +3V to -3V or -3V to

+3V, T A = +25°C

Ω

150

V/µs

C L = 150pF to 2500pF,

MBAUD = GND

__________________________________________Typical Operating Characteristics

(V CC = +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k

Ω

and C L , T A = +25°C, unless otherwise noted.)

MAX3222E/MAX3232E

TRANSMITTER OUTPUT VOLTAGE

vs. LOAD CAPACITANCE

MAX3222E/MAX3232E

SLEW RATE vs. LOAD CAPACITANCE

MAX3222E/MAX3232E

OPERATING SUPPLY CURRENT

vs. LOAD CAPACITANCE

T1 TRANSMITTING AT 250kbps

T2 TRANSMITTING AT 15.6kbps

V OUT+

-SLEW

250kbps

T1 TRANSMITTING AT 250kbps

T2 TRANSMITTING AT 15.6kbps

120kbps

+SLEW

-1

20kbps

-2

-3

-4

V OUT-

-5

FOR DATA RATES UP TO 250kbps

-6

1000

2000

3000

4000

5000

1000

2000

3000

4000

5000

1000

2000

3000

4000

5000

LOAD CAPACITANCE (pF)

4 _______________________________________________________________________________________

R L = 3k

V CC = 3.0V to 4.5V, R L = 3k

V CC = 4.5V to 5.5V, R L = 3k

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

Up to 1Mbps, True RS-232 Transceivers

Typical Operating Characteristics (continued)

(V CC = +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3k Ω and C L , T A = +25°C, unless otherwise noted.)

MAX3241E

TRANSMITTER OUTPUT VOLTAGE

vs. LOAD CAPACITANCE

MAX3241E

SLEW RATE vs. LOAD CAPACITANCE

MAX3241E

OPERATING SUPPLY CURRENT

vs. LOAD CAPACITANCE

1 TRANSMITTER AT 250kbps

2 TRANSMITTERS AT 15.6kbps

V OUT+

250kbps

1 TRANSMITTER AT 250kbps

2 TRANSMITTERS AT 15.6kbps

120kbps

-1

20kbps

-2

-3

-4

V OUT-

-5

-6

1000

2000

3000

4000

5000

1000

2000

3000

4000

5000

1000

2000

3000

4000

5000

LOAD CAPACITANCE (pF)

TRANSMITTER OUTPUT VOLTAGE

vs. LOAD CAPACITANCE

MAX3237E

TRANSMITTER OUTPUT VOLTAGE

vs. LOAD CAPACITANCE (MBAUD = V CC )

MAX3237E

SLEW RATE vs. LOAD CAPACITANCE

(MBAUD = GND)

7.5

1Mbps

V OUT +

5.0

2Mbps

1.5Mbps

SR-

2.5

FOR DATA RATES UP TO 250kbps

1 TRANSMITTER 250kbps

4 TRANSMITTERS 15.6kbps

ALL TRANSMITTERS LOADED

WITH 3k Ω + C L

1 TRANSMITTER AT FULL DATA RATE

4 TRANSMITTERS AT 1/16 DATA RATE

3k Ω + C L LOAD, EACH OUTPUT

SR+

-1

-2.5

-2

1 TRANSMITTER AT 250kbps

4 TRANSMITTERS 15.6kbps

ALL TRANSMITTERS LOADED

WITH 3k

1.5Mbps

-3

2Mbps

-5.0

-4

1Mbps

+ C L

-5

V OUT-

Ω

-7.5

-6

500

1000

1500

2000

500

1000 1500

2000 2500 3000

500

1000 1500

2000 2500 300

LOAD CAPACITANCE (pF)

MAX3237E

SLEW RATE vs. LOAD CAPACITANCE

(MBAUD = V CC )

MAX3237E

SUPPLY CURRENT vs. LOAD CAPACITANCE

WHEN TRANSMITTING DATA (MBAUD = GND)

MAX3237E

TRANSMITTER SKEW vs. LOAD CAPACITANCE

(MBAUD = V CC )

100

-SLEW, 1Mbps

+SLEW, 1Mbps

250kbps

120kbps

-SLEW, 2Mbps

+SLEW, 2Mbps

20kbps

1 TRANSMITTER AT FULL DATA RATE

4 TRANSMITTERS AT 1/16 DATA RATE

3k Ω + C L LOAD EACH OUTPUT

1 TRANSMITTER AT 20kbps, 120kbps, 250kbps

4 TRANSMITTERS AT 15.6kbps

ALL TRANSMITTERS LOADED

WITH 3k Ω + C L

|t PLH - t PHL |

1 TRANSMITTER AT 500kbps

4 TRANSMITTERS AT 1/16 DATA RATE

ALL TRANSMITTERS LOADED

WITH 3k Ω + C L

500

1000

1500

2000

500

1000 1500

2000 2500 3000

500

1000

1500

2000

LOAD CAPACITANCE (pF)

_______________________________________________________________________________________ 5

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