_______________General Description

The MAX218 RS-232 transceiver is intended for battery-

powered EIA/TIA-232E and V.28/V.24 communications

interfaces that need two drivers and two receivers with

minimum power consumption. It provides a wide +1.8V

to +4.25V operating voltage range while maintaining

true RS-232 and EIA/TIA-562 voltage levels. The

MAX218 runs from two alkaline, NiCd, or NiMH cells

without any form of voltage regulator.

A shutdown mode reduces current consumption to

1µA, extending battery life in portable systems. While

shut down, all receivers can remain active or can be

disabled under logic control, permitting a system incor-

porating the CMOS MAX218 to monitor external

devices while in low-power shutdown mode.

A guaranteed 120kbps data rate provides compatibility

with popular software for communicating with personal

computers. Three-state drivers are provided on all

receiver outputs so that multiple receivers, generally of

different interface standards, can be wire-ORed at the

UART. The MAX218 is available in 20-pin DIP, SO, and

SSOP packages.

________________________Applications

Battery-Powered Equipment

Computers

Printers

Peripherals

Instruments

Modems

____________________________Features

BETTER THAN BIPOLAR!

o Operates Directly from Two Alkaline, NiCd,

or NiMH Cells

o +1.8V to +4.25V Supply Voltage Range

o 120kbps Data Rate

o Low-Cost Surface-Mount Components

o Meets EIA/TIA-232E Specifications

o 1µA Low-Power Shutdown Mode

o Both Receivers Active During Low-Power Shutdown

o Three-State Receiver Outputs

o Flow-Through Pinout

o On-Board DC-DC Converters

o 20-Pin SSOP, Wide SO, or DIP Packages

______________Ordering Information

*Contact factory for dice specifications.

1.8V to 4.25V-Powered,

True RS-232 Dual Transceiver

________________________________________________________________

Maxim Integrated Products

1

20

19

18

17

16

15

14

13

1

2

3

4

5

6

7

8

GND

V+

C1+

GND

EN

SHDN

N.C.

LX

TOP VIEW

C1-

V-

T1OUT

T2OUT

T2IN

T1IN

GND

12

11

9

10

R1IN

R2IN

R2OUT

R1OUT

DIP/SO/SSOP

MAX218

__________________Pin Configuration

R1

R2

T1

T2

T1OUT

T2OUT

T1IN

T2IN

R1OUT

R2OUT

R1IN

R2IN

GND

EN

SHDN

LX

C1+

C1-

V-

6

3

7

8

9

10

11

12

13

14

16

18

15

4

5, 17, 20

MAX218

ENABLE

ON/OFF

1.8V

TO

4.25V

1

V+

19

__________Typical Operating Circuit

Call toll free 1-800-998-8800 for free samples or literature.

19-0246; Rev 1; 7/95

PART

TEMP. RANGE

MAX218CPP

0°C to +70°C

MAX218C/D

0°C to +70°C

Dice*

20 Plastic DIP

PIN-PACKAGE

MAX218CAP

0°C to +70°C

20 SSOP

MAX218EPP

-40°C to +85°C

MAX218EAP

-40°C to +85°C

20 SSOP

20 Plastic DIP

MAX218EWP

-40°C to +85°C

20 Wide SO

MAX218CWP

0°C to +70°C

20 Wide SO