General Description

The MAX3221E/MAX3223E/MAX3243E are 3V-powered

EIA/TIA-232 and V.28/V.24 communications interfaces

with automatic shutdown/wakeup features, 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, to ±8kV using IEC 1000-4-2 Contact

Discharge, and to ±15kV using the Human Body Model.

The MAX3221E/MAX3223E/MAX3243E achieve a

1µA supply current with Maxim’s revolutionary

AutoShutdown™ feature. They save power without

changes to the existing BIOS or operating system by enter-

ing low-power shutdown mode when the RS-232 cable is

disconnected, or when the transmitters of the connected

peripherals are off.

The transceivers have a proprietary low-dropout trans-

mitter 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 capaci-

tors for operation from a +3.3V supply. Each device is

guaranteed to run at data rates of 250kbps while main-

taining RS-232 output levels.

The MAX3221E contains just one driver and one receiver,

making it the smallest single-supply RS-232 transceiver.

The MAX3223E has two drivers and two receivers. The

MAX3243E is a complete 3-driver/5-receiver serial port

ideal for notebook or subnotebook computers. It also

includes two noninverting receiver outputs that are always

active, allowing external devices to be monitored without

forward biasing the protection diodes in circuitry that may

be powered down.

The MAX3221E, MAX3223E, and MAX3243E are avail-

able in space-saving SSOP packages.

Applications

Notebook, Subnotebook, and Palmtop Computers

Cellular Phones

Battery-Powered Equipment

Hand-Held Equipment

Peripherals

Printers

Features

o ESD Protection for RS-232 I/O Pins:

±15kV—Human Body Model

±8kV—IEC1000-4-2, Contact Discharge

±15kV—IEC1000-4-2, Air-Gap Discharge

o Latchup Free

o 1µA Supply Current

o 250kbps Guaranteed Data Rate

o 6V/µs Guaranteed Slew Rate

o Meets EIA/TIA-232 Specifications Down to 3.0V

o Smallest Single-Supply RS-232 Transceiver

(MAX3221E)

o Guaranteed Mouse Driveability (MAX3243E)

o Small 0.1µF Capacitors

±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps,

RS-232 Transceivers with AutoShutdown

________________________________________________________________

Maxim Integrated Products

1

19-1283; Rev 2; 1/98

PART

MAX3221ECAE

MAX3221EEAE

-40°C to +85°C

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

16 SSOP

16 SSOP

AutoShutdown is a trademark of Maxim Integrated Products.

†

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; 5,649,210; and other patents pending.

Pin Configurations appear at end of data sheet.

Typical Operating Circuits appear at end of data sheet.

MAX3223EEPP

-40°C to +85°C

20 Plastic DIP

MAX3223EEAP

-40°C to +85°C

20 SSOP

MAX3243ECWI

0°C to +70°C

28 Wide SO

MAX3243ECAI

0°C to +70°C

28 SSOP

MAX3243EEWI

-40°C to +85°C

28 Wide SO

MAX3243EEAI

-40°C to +85°C

28 SSOP

MAX3223ECPP

MAX3223ECAP

0°C to +70°C

0°C to +70°C

20 Plastic DIP

20 SSOP

Ordering Information

Selector Guide

MAX3221E

MAX3223E

MAX3243E

1/1

2/2

3.0 to 5.5

3.0 to 5.5

3.0 to 5.5

3/5

PART

NO. OF

DRIVERS/

RECEIVERS

(V)

AUTOSHUTDOWN

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 408-737-7600 ext. 3468.