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

General Description

The MAX3387E 3V powered EIA/TIA-232 and V.28/V.24

is a communications interface with low power require-

ments, high data-rate capabilities, and enhanced elec-

trostatic discharge (ESD) protection. The MAX3387E

has three receivers and three transmitters. All RS-232

inputs and outputs are protected to ±15kV using the

IEC 1000-4-2 Air-Gap Discharge method, ±8kV using

the IEC 1000-4-2 Contact Discharge method, and

±15kV using the Human Body Model.

A proprietary low-dropout transmitter output stage

enables 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. The MAX3387E is capa-

ble of running at data rates up to 250kbps while main-

taining RS-232 compliant output levels.

eration in mixed-logic voltage systems. Both input and

output logic levels are pin programmable through the

TSSOP package.

Applications

Subnotebook/Palmtop Computers

PDAs and PDA Cradles

Cell Phone Data Cables

Battery-Powered Equipment

Hand-Held Equipment

Peripherals

Features

Systems

o ±15kV ESD Protection on Rx Inputs and Tx Outputs

o Low 300µA Supply Current

o Guaranteed 250kbps Data Rate

o 1µA AutoShutdown Plus™ with Receivers Active

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

3V, ±15kV ESD-Protected, AutoShutdown Plus

RS-232 Transceiver for PDAs and Cell Phones

________________________________________________________________

Maxim Integrated Products

1

24

23

22

21

20

19

18

17

1

2

3

4

5

6

7

8

FORCEOFF

GND

T1OUT

C2+

C1-

V+

C1+

TOP VIEW

T2OUT

T3OUT

R1IN

R2IN

T2IN

T1IN

V-

C2-

16

15

14

13

9

10

11

12

R3IN

R1OUT

R2OUT

R3OUT

FORCEON

T3IN

INVALID

TSSOP

MAX3387E

C1

0.1

µF

C2

0.1

µF

MAX3387E

R2OUT

13

R1OUT

14

R2IN 17

GND

22

RS-232

OUTPUTS

TTL/CMOS

INPUTS

T2IN

8

T1IN

7

C2-

5

C2+

4

C1-

3

C1+

1

R1IN 18

T2OUT 20

T1OUT 21

V-

6

V+

2

C4

0.1

µF

23

15

+3.3V

T3IN

10

T3OUT 19

RS-232

INPUTS

TTL/CMOS

OUTPUTS

C3

0.1

µF

5k

5k

R3OUT

12

R3IN 16

5k

FORCEOFF

24

INVALID

9

11

FORCEON

Typical Operating Circuit

19-1561; Rev 1; 10/99

Pin Configuration

Ordering Information

AutoShutdown Plus is a trademark of Maxim Integrated Products.

PART

MAX3387ECUG

MAX3387EEUG

TEMP. RANGE

0°C to +70°C

-40°C to +85°C

PIN-PACKAGE

24 TSSOP

24 TSSOP