ADM5170

REV. 0

One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.

Tel: 617/329-4700

Fax: 617/326-8703

a

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reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

Octal, RS-232/RS-423 Line Driver

Truth Table

Inputs

Outputs

EN

Data

RS-423A

00

(V

5 V to 6 V

01

(V

–5 V to –6 V

1

X

High Z

High Z

FEATURES

Eight Single Ended Line Drivers in One Package

Meets EIA Standard RS-232E, RS-423A and

CCITT V.10/X.26

Resistor Programmable Slew Rate

Wide Supply Voltage Range

Low Power CMOS

3-State Outputs

TTL/CMOS Compatible Inputs

Output Short Circuit Protection

Available in 28-Pin DIP/PLCC

Low Power Replacement for UC5170C

APPLICATIONS

High Speed Communication

Computer I-O Ports Peripherals

High Speed Modems

Printers

Logic Level Translation

FUNCTIONAL BLOCK DIAGRAM

A

B

C

D

E

F

G

H

RS-232/RS-423

MODE SELECT

ADM5170

SLEW RATE

CONTROL

EN

MS+

MS–

SRA

GENERAL DESCRIPTION

The ADM5170 is an octal line driver suitable for digital communi-

cation systems with data rates up to 116 kB/s. Input TTL or

CMOS signal levels are inverted and translated into either EIA

RS-232E or RS-423A signal levels depending on the status of the

Mode Select inputs MS+ and MS–. With both Mode Select inputs

at GND, RS-423 operation is selected while with MS+ connected

to V

The output slew rates may be controlled using an external resistor

connected between the SRA (Slew Rate Adjust) pin and GND.

Resistor values between 2 k

Ω and 10 kΩ may be selected giving a

slew rate which can be adjusted from 10 V/

µs to 2.2 V/µs. This

adjustment of the slew rate allows tailoring of the output character-

istics to suit the interface cable being used.

The outputs may be disabled using the EN (Enable Input). This

feature permits sharing of a common output line.

The ADM5170 is fabricated on an advanced CMOS process

featuring low power consumption. In the disabled state the power

consumption reduces from 500 mW to 40 mW. The ADM5170 is

available in both 28-pin DIP and 28-lead PLCC packages.