TL/F/6550
54157/DM54157/DM74157
Quad
2-Line
to
1-Line
Data
Selectors/Multiplexers
June 1989
54157/DM54157/DM74157
Quad 2-Line to 1-Line Data Selectors/Multiplexers
General Description
These data selectors/multiplexers contain inverters and
drivers to supply full on-chip data selection to the four out-
put gates. A separate strobe input is provided. A 4-bit word
is selected from one of two sources and is routed to the four
outputs.
Applications
Y
Expand any data input point
Y
Multiplex dual data buses
Y
Generate four functions of two variables (one variable
is common)
Y
Source programmable counters
Features
Y
Buffered inputs and outputs
Y
Typical propagation time 9 ns
Y
Typical power dissipation 150 mW
Y
Alternate Military/Aerospace device (54157) is avail-
able. Contact a National Semiconductor Sales Office/
Distributor for specifications.
Connection Diagram
Dual-In-Line Package
TL/F/6550–1
Order Number 54157DMQB, 54157FMQB, DM54157J, DM54157W or DM74157N
See NS Package Number J16A, N16E or W16A
Function Table
Inputs
Output Y
Strobe Select A B
HXXXL
LLL
HXH
LHXLL
HH
HeHigh Level, L e Low Level, X e Don’t Care
C
1995 National Semiconductor Corporation RRD-B30M105/Printed in U. S. A.