DS3487

General Description

National’s quad RS-422 driver features four independent

drivers which comply with EIA Standards for the electrical

characteristics of balanced voltage digital interface circuits.

The outputs are TRI-STATE structures which are forced to a

high impedance state when the appropriate output control

pin reaches a logic zero condition. All input pins are PNP

buffered to minimize input loading for either logic one or logic

zero inputs.

Features

n Four independent drivers

n Fast propagation times (typ 10 ns)

n TTL compatible

n 5V supply

n Output rise and fall times less than 15 ns

n Pin compatible with DS8924 and MC3487

Block and Connection Diagrams

Truth Table

Input

Control

Non-Inverting

Inverting

Input

Output

Output

HH

H

L

LH

L

H

XL

Z

Z

L = Low logic state

H = High logic state

X = Irrelevant

Z = TRI-STATE(high impedance)

DS005780-1

Dual-In-Line Package

DS005780-2

Top View

Order Number DS3487M or DS3487N

See NS Package Number M16A or N16E

May 1998

© 1998 National Semiconductor Corporation

DS005780

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