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Número de pieza | DS34C87TN | |
Descripción | CMOS Quad TRISTATE Differential Line Driver | |
Fabricantes | National Semiconductor | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de DS34C87TN (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
No Preview Available ! May 1998
DS34C87T
CMOS Quad TRISTATE 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 spe-
cial 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 VCC 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 VCC = 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
DS008576-1
Top View
Order Number DS34C87TM or DS34C87TN
See NS Package Number M16A or N16E
Truth Table
Input
H
L
X
Control
Input
H
H
L
Non-Inverting
Output
H
L
Z
L = Low logic state
H = High logic state
X = Irrelevant
Z = TRI-STATE (high performance)
DS008576-2
Inverting
Output
L
H
Z
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS008576
www.national.com
1 page AC Test Circuit and Switching Time Waveforms (Continued)
DS008576-10
FIGURE 8. Load Propagation Delays for “LS-Type” Load
DS008576-11
FIGURE 9. Load Enable and Disable Times for “LS-Type” Load
Typical Applications
*RT is optional although highly recommended to reduce reflection.
DS008576-12
5 www.national.com
5 Page |
Páginas | Total 8 Páginas | |
PDF Descargar | [ Datasheet DS34C87TN.PDF ] |
Número de pieza | Descripción | Fabricantes |
DS34C87T | CMOS Quad TRISTATE Differential Line Driver | National Semiconductor |
DS34C87T | DS34C87T CMOS Quad TRI-STATE Differential Line Driver (Rev. B) | Texas Instruments |
DS34C87TM | CMOS Quad TRISTATE Differential Line Driver | National Semiconductor |
DS34C87TN | CMOS Quad TRISTATE Differential Line Driver | National Semiconductor |
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