DS34C87T_02 Datasheet, PDF (1/8 Pages) National Semiconductor (TI) – CMOS Qual TRI-STATE Differential Line Driver

April 2002
DS34C87T
CMOS Quad TRI-STATE Differential Line Driver
General Description
The DS34C87T is a quad differential line driver designed for
digital data transmission over balanced lines. The
DS34C87T meets all the requirements of EIA standard
RS-422 while retaining the low power characteristics of
CMOS. This enables the construction of serial and terminal
interfaces while maintaining minimal power consumption.
The DS34C87T accepts TTL or CMOS input levels and
translates these to RS-422 output levels. This part uses
special output circuitry that enables the individual drivers to
power down without loading down the bus. This device has
separate enable circuitry for each pair of the four drivers.
The DS34C87T is pin compatible to the DS3487T.
All inputs are protected against damage due to electrostatic
discharge by diodes to V_CC and ground.
Features
n TTL input compatible
n Typical propagation delays: 6 ns
n Typical output skew: 0.5 ns
n Outputs won’t load line when V_CC = 0V
n Meets the requirements of EIA standard RS-422
n Operation from single 5V supply
n TRI-STATE outputs for connection to system buses
n Low quiescent current
n Available in surface mount
Connection and Logic Diagrams
Dual-In-Line Package
00857601
See Pin Description Table for details
Top View
Order Number DS34C87TM or DS34C87TN
See NS Package Number M16A or N16E
Truth Table
Input Control Non-Inverting
Input
Output
H
H
H
L
H
L
X
L
Z
L = Low logic state
H = High logic state
X = Irrelevant
Z = TRI-STATE (high performance)
00857602
Inverting
Output
L
H
Z
© 2002 National Semiconductor Corporation DS008576
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