54125 DM54125 DM74125 Quad TRI-STATE Buffers
June 1989
54125 DM54125 DM74125
Quad TRI-STATE Buffers
General Description
This device contains four independent gates each of which
performs a non-inverting buffer function The outputs have
the TRI-STATE feature When enabled the outputs exhibit
the low impedance characteristics of a standard TTL output
with additional drive capability at the high Logic level to per-
mit the driving of bus lines without external pull-up resistors
When disabled both the output transistors are turned off
presenting a high-impedance state to the bus line Thus the
output will act neither as a significant load nor as a driver
To minimize the possibility that two outputs will attempt to
take a common bus to opposite logic levels the disable time
is shorter than the enable time of the outputs
Features
Y
Alternate Military Aerospace device (54125) is avail-
able Contact a National Semiconductor Sales Office
Distributor for specifications
Connection Diagram
Dual-In-Line Package
TL F 6540 – 1
Order Number 54125DMQB 54125FMQB DM54125J DM54125W or DM74125N
See NS Package Number J14A N14A or W14B
Function Table
Y
e
A
Inputs
A
L
H
X
C
L
L
H
Output
Y
L
H
Hi-Z
H
e
High Logic Level
L
e
Low Logic Level
X
e
Either Low or High Logic Level
Hi-Z
e
TRI-STATE (Outputs are disabled)
TRI-STATE is a registered trademark of National Semiconductor Corporation
C
1995 National Semiconductor Corporation
TL F 6540
RRD-B30M105 Printed in U S A
NSC [ NATIONAL SEMICONDUCTOR ]
