DS26C31T/DS26C31M CMOS Quad TRI-STATE Differential Line Driver
June 1998
DS26C31T/DS26C31M
CMOS Quad TRI-STATE
®
Differential Line Driver
General Description
The DS26C31 is a quad differential line driver designed for
digital data transmission over balanced lines. The
DS26C31T meets all the requirements of EIA standard
RS-422 while retaining the low power characteristics of
CMOS. The DS26C31M is compatible with EIA standard
RS-422; however, one exception in test methodology is
taken (Note 8). This enables the construction of serial and
terminal interfaces while maintaining minimal power con-
sumption.
The DS26C31 accepts TTL or CMOS input levels and trans-
lates these to RS-422 output levels. This part uses special
output circuitry that enables the drivers to power down with-
out loading down the bus. This device has enable and dis-
able circuitry common to all four drivers. The DS26C31 is pin
compatible to the AM26LS31 and the DS26LS31.
All inputs are protected against damage due to electrostatic
discharge by diodes to V
CC
and ground.
Features
n
n
n
n
n
n
n
n
n
n
TTL input compatible
Typical propagation delays: 6 ns
Typical output skew: 0.5 ns
Outputs will not load line when V
CC
= 0V
DS26C31T meets the requirements of EIA standard
RS-422
Operation from single 5V supply
TRI-STATE outputs for connection to system buses
Low quiescent current
Available in surface mount
Mil-Std-883C compliant
Connection Diagrams
Dual-In-Line Package
20-Lead Ceramic Leadless Chip Carrier (E)
DS008574-1
Top View
Order Number DS26C31TM or DS26C31TN
See NS Package Number M16A or N16E
For Complete Military Product Specifications,
refer to the appropriate SMD or MDS.
Order Number DS26C31ME/883, DS26C31MJ/883
or DS26C31MW/883
See NS Package Number E20A, J16A or W16A
DS008574-12
Truth Table
ENABLE ENABLE
L
All other
combinations of
enable inputs
L = Low logic state
X = Irrelevant
H = High logic state
Z = TRI-STATE (high impedance)
Input
X
L
H
Non-Inverting
Output
Z
L
H
Inverting
Output
Z
H
L
H
TRI-STATE
®
is a registered trademark of National Semiconductor Corporation.
FACT
™
is a trademark of National Semiconductor Corporation.
© 1998 National Semiconductor Corporation
DS008574
www.national.com
NSC [ NATIONAL SEMICONDUCTOR ]
