DS9638 RS-422 Dual High Speed Differential Line Driver
May 1998
DS9638
RS-422 Dual High Speed Differential Line Driver
General Description
The DS9638 is a Schottky, TTL compatible, dual differential
line driver designed specifically to meet the EIA Standard
RS-422 specifications. It is designed to provide unipolar dif-
ferential drive to twisted pair or parallel wire transmission
lines. The inputs are TTL compatible. The outputs are similar
to totem pole TTL outputs, with active pull-up and pull-down.
The device features a short circuit protected active pull-up
with low output impedance and is specified to drive 50Ω
transmission lines at high speed. The mini-DIP provides high
package density.
Features
Single 5V supply
Schottky technology
TTL and CMOS compatible inputs
Output short circuit protection
Input clamp diodes
Complementary outputs
Minimum output skew (
<
1.0 ns typical)
50 mA output drive capability for 50Ω transmission lines
Meets EIA RS-422 specifications
Propagation delay of less than 10 ns
“Glitchless” differential output
Delay time stable with V
CC
and temperature variations
(
<
2.0 ns typical) (Figure
3)
n
Extended temperature range
n
n
n
n
n
n
n
n
n
n
n
n
Connection Diagram
8-Lead DIP
DS009622-1
Top View
Order Number DS9638CM or DS9638CN
See NS Package Number M08A or N08E
For Complete Military Product Specifications,
refer to the appropriate SMD or MDS.
Order Number DS9638MJ/883
See NS Package Number J08A
© 1998 National Semiconductor Corporation
DS009622
www.national.com
NSC [ NATIONAL SEMICONDUCTOR ]
