June 1989
54LS157/DM54LS157/DM74LS157,
54LS158/DM54LS158/DM74LS158
Quad 2-Line to 1-Line Data Selectors/Multiplexers
General Description
Features
Y
Buffered inputs and outputs
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. The LS157 presents true data whereas the LS158
presents inverted data to minimize propagation delay time.
Y
Typical Propagation Time
LS157 9 ns
LS158 7 ns
Y
Typical Power Dissipation
LS157 49 mW
LS158 24 mW
Y
Applications
Y
Alternate
Military/Aerospace
device
(54LS157,
54LS158) is available. Contact a National Semiconduc-
tor Sales Office/Distributor for specifications.
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
Connection Diagrams
Dual-In-Line Package
Dual-In-Line Package
TL/F/6396–2
TL/F/6396–1
Order Number 54LS158DMQB, 54LS158FMQB,
54LS158LMQB, DM54LS158J, DM54LS158W,
DM74LS158M or DM74LS158N
Order Number 54LS157DMQB, 54LS157FMQB,
54LS157LMQB, DM54LS157J, DM54LS157W,
DM74LS157M or DM74LS157N
See NS Package Number E20A, J16A,
M16A, N16E or W16A
See NS Package Number E20A, J16A,
M16A, N16E or W16A
Function Table
Inputs
Output Y
Strobe
Select
A
B
LS157
LS158
H
L
L
L
L
X
L
X
L
X
X
X
L
L
L
H
H
L
L
H
X
X
H
L
H
H
H
L
H
H
e
e
e
Low Level, X Don’t Care
H
High Level, L
C
1995 National Semiconductor Corporation
TL/F/6396
RRD-B30M105/Printed in U. S. A.