AVAILABLE

Functional Diagrams

Pin Configurations appear at end of data sheet.

Functional Diagrams continued at end of data sheet.

UCSP is a trademark of Maxim Integrated Products, Inc.

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

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 TQFN, SSOP, and TSSOP pack-

ages.

Applications

Notebook, Subnotebook, and Palmtop Computers

Cellular Phones

Battery-Powered Equipment

Handheld Equipment

Peripherals

Printers

Next Generation Device Features

o For Space-Constrained Applications:

MAX3228E/MAX3229E: ±15kV ESD-Protected, +2.5V

to +5.5V RS-232 Transceivers in UCSP™

MAX3222E/MAX3232E/MAX3237E/MAX3241E/

MAX3246E: ±15kV ESD-Protected Down to 10nA,

+3.0V to +5.5V, Up to 1Mbps, True RS-232

Transceivers (MAX3246E Available in a UCSP

Package)

o For 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

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

RS-232 Transceivers with AutoShutdown

AutoShutdown and UCSP are trademarks of Maxim Integrated Products, Inc.

Pin Configurations appear at end of data sheet.

Typical Operating Circuits appear at end of data sheet.

*Exposed pad.

+

Denotes a lead(Pb)-free/RoHS-compliant package.

/V

denotes an automotive qualified part.

Ordering Information continued at end of data sheet.

Ordering Information

Selector Guide

PART

NO. OF

DRIVERS/

RECEIVERS

VCC

RANGE

(V)

AutoShutdown

MAX3221E

1/1

+3.0 to +5.5

MAX3223E

2/2

+3.0 to +5.5

MAX3243E

3/5

+3.0 to +5.5

PART

TEMP RANGE

PIN-PACKAGE

MAX3221ECTE+

0°C to +70°C

16 TQFN-EP*

MAX3221ECUE+

0°C to +70°C

16 TSSOP

MAX3221ECAE+

0°C to +70°C

16 SSOP

MAX3221EEAE+

-40°C to +85°C

16 SSOP

MAX3221EETE+

-40°C to +85°C

16 TQFN-EP*

MAX3221EEUE+

-40°C to +85°C

16 TSSOP

MAX3223ECPP+

0°C to +70°C

20 PDIP

MAX3223ECAP+

0°C to +70°C

20 SSOP

MAX3223ECUP+

0°C to +70°C

20 TSSOP

MAX3223ECTP+

0°C to +70°C

20 TQFN-EP*

MAX3223EEPP+

-40°C to +85°C

20 PDIP

MAX3223EEAP+

-40°C to +85°C

20 SSOP

MAX3223EEUP+

-40°C to +85°C

20 TSSOP

MAX3223EETP+

-40°C to +85°C

20 TQFN-EP*

MAX3223EEUP/V+

-40°C to +85°C

20 TSSOP

19-1283; Rev 7; 8/11

MAX3221E/

MAX3223E/MAX3243E