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

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

General Description

The MAX221E is a +5V powered, single transmit/

receive RS-232 and V.28 communications interface with

automatic shutdown/wake-up features and high data

rate capabilities.

The MAX221E features enhanced electrostatic discharge

(ESD) protection. Both the transmitter output and receiver

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

Gap Discharge Method, to ±8kV using the IEC 1000-4-2

Contact Discharge Method, and to ±15kV using the

Human Body Model.

The MAX221E achieves a low 1µA supply current with

Maxim’s revolutionary AutoShutdown™ feature.

AutoShutdown saves power without changes to the

existing BIOS or operating system by entering low-

power shutdown mode when the RS-232 cable is dis-

connected or when the transmitter of the connected

peripheral is off. The MAX221E wakes up and drives the

INVALID pin high when an active RS-232 cable is con-

nected, signaling the host that a peripheral is connected

to the communications port.

The MAX221E is available in a 16-pin SSOP package as

well as a 16-pin TSSOP that uses 50% less board space

than a 16-pin SO.

Applications

Maintenance/Diagnostic Ports

Industrial Systems

Telecommunications

Set-Top Boxes

Features

o Single RS-232 Transceiver in a Small 16-Pin TSSOP

o ESD Protection for RS-232 I/O Pins

±15kV—Human Body Model

±8kV—IEC 1000-4-2, Contact Discharge

±15kV—IEC 1000-4-2, Air-Gap Discharge

o Latchup Free

o 1µA Supply Current

o AutoShutdown Saves Power without Changes

to BIOS

o Guaranteed 250kbps Data Rate

±15kV ESD-Protected, +5V, 1µA, Single RS-232

Transceiver with AutoShutdown

________________________________________________________________

Maxim Integrated Products

1

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

EN

FORCEOFF

GND

TOUT

FORCEON

TIN

INVALID

ROUT

TOP VIEW

MAX221E

TSSOP/SSOP

C1+

V+

C2-

C1-

C2+

V-

RIN

MAX221E

FORCEON

EN

12

1

ROUT

9

FORCEOFF

16

INVALID

10

GND

14

TIN

11

C2-

6

C2+

5

C1-

4

C1+

2

RIN 8

TOUT 13

V-

7

V+

3

C4

0.1

µF

C3

0.1

µF

15

C1

0.1

µF

C2

0.1

µF

0.1

µF

+5V

TO POWER-

MANAGEMENT

UNIT

CAPACITORS MAY BE

POLARIZED OR UNPOLARIZED.

5k

Typical Operating Circuit

19-1527; Rev 0; 8/99

PART

MAX221ECUE

MAX221ECAE

MAX221EEUE

40°C to +85°C

0°C to +70°C

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

16 TSSOP

16 SSOP

16 TSSOP

Pin Configuration

Ordering Information

AutoShutdown is a trademark of Maxim Integrated Products.

MAX221EEAE

40°C to +85°C

16 SSOP