DS1489/DS1489A Quad Line Receiver
May 1998
DS1489/DS1489A
Quad Line Receiver
General Description
The DS1489/DS1489A are quad line receivers designed to
interface data terminal equipment with data communications
equipment. They are constructed on a single monolithic sili-
con chip. These devices satisfy the specifications of EIA
Standard RS-232D. The DS1489/DS1489A meet and ex-
ceed the specifications of MC1489/MC1489A and are
pin-for-pin replacements.
Features
n
n
n
n
n
Four separate receivers per package
Programmable threshold
Built-in input threshold hysteresis
“Fail safe” operating mode: high output for open inputs
Inputs withstand
±
30V
Schematic and Connection Diagrams
DS005777-1
(
1
⁄
4
of unit shown)
DS1489: R
F
= 10k
DS1489A: R
F
= 2k
Dual-In-Line Package
DS005777-2
Top View
Order Number DS1489M, DS1489N
DS1489AM or DS1489AN
See NS Package Number M14A or N14A
© 1998 National Semiconductor Corporation
DS005777
www.national.com
NSC [ NATIONAL SEMICONDUCTOR ]
