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54LS157 View Datasheet(PDF) - National ->Texas Instruments

Part NameDescriptionManufacturer
54LS157 Quad 2-Line to 1-Line Data Selectors/Multiplexers National-Semiconductor
National ->Texas Instruments National-Semiconductor
54LS157 Datasheet PDF : 8 Pages
1 2 3 4 5 6 7 8
June 1989
54LS157 DM54LS157 DM74LS157
54LS158 DM54LS158 DM74LS158
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 The LS157 presents true data whereas the LS158
presents inverted data to minimize propagation delay time
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
LS157 9 ns
LS158 7 ns
Y Typical Power Dissipation
LS157 49 mW
LS158 24 mW
Y Alternate Military Aerospace device (54LS157
54LS158) is available Contact a National Semiconduc-
tor Sales Office Distributor for specifications
Connection Diagrams
Dual-In-Line Package
Dual-In-Line Package
TL F 6396 – 1
Order Number 54LS157DMQB 54LS157FMQB
54LS157LMQB DM54LS157J DM54LS157W
DM74LS157M or DM74LS157N
See NS Package Number E20A J16A
M16A N16E or W16A
TL F 6396 – 2
Order Number 54LS158DMQB 54LS158FMQB
54LS158LMQB DM54LS158J DM54LS158W
DM74LS158M or DM74LS158N
See NS Package Number E20A J16A
M16A N16E or W16A
Function Table
Inputs
Output Y
Strobe Select A B LS157 LS158
H
X
XX
L
H
L
L
LX
L
H
L
L
HX
H
L
L
H
XL
L
H
L
H
XH
H
L
H e High Level L e Low Level X e Don’t Care
C1995 National Semiconductor Corporation TL F 6396
RRD-B30M105 Printed in U S A
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