DS1691A/DS3691 (RS-422/RS-423) Line Drivers with TRI-STATE Outputs
July 1998
DS1691A/DS3691
(RS-422/RS-423) Line Drivers with TRI-STATE
®
Outputs
General Description
The DS1691A/DS3691 are low power Schottky TTL line driv-
ers designed to meet the requirements of EIA standards
RS-422 and RS-423. They feature 4 buffered outputs with
high source and sink current capability with internal short cir-
cuit protection. A mode control input provides a choice of op-
eration either as 4 single-ended line drivers or 2 differential
line drivers. A rise time control pin allows the use of an exter-
nal capacitor to slow the rise time for suppression of near
end crosstalk to other receivers in the cable. Rise time ca-
pacitors are primarily intended for waveshaping output sig-
nals in the single-ended driver mode. Multipoint applications
in differential mode with waveshaping capacitors is not al-
lowed.
With the mode select pin low, the DS1691A/DS3691 are
dual-differential line drivers with TRI-STATE outputs. They
feature
±
10V output common-mode range in TRI-STATE
mode and 0V output unbalance when operated with
±
5V
supply.
Features
n
Dual RS-422 line driver with mode pin low, or quad
RS-423 line driver with mode pin high
n
TRI-STATE outputs in RS-422 mode
n
Short circuit protection for both source and sink outputs
n
Outputs will not clamp line with power off or in
TRI-STATE
n
100Ω transmission line drive capability
n
Low I
CC
and I
EE
power consumption
RS-422: I
CC
= 9 mA/driver typ
RS-423: I
CC
= 4.5 mA/driver typ:
I
EE
= 2.5 mA/driver typ
n
Low current PNP inputs compatible with TTL, MOS and
CMOS
n
Pin compatible with AM26LS30
Connection Diagrams
With Mode Select LOW
(RS-422 Connection)
With Mode Select HIGH
(RS-423 Connection)
DS005783-1
DS005783-2
Top View
Top View
Ordering Information
Order Number
DS3691M
DS3691N
DS1691AJ/883
Package Type
SO Package
Molded DIP
Ceramic DIP
NS Package Number
M16A
N16E
J16A
For Complete Military Product Specifications, refer to the appropriate SMD or MDS.
TRI-STATE
®
is a registered trademark of National Semiconductor Corporation.
© 1998 National Semiconductor Corporation
DS005783
www.national.com
NSC [ NATIONAL SEMICONDUCTOR ]
