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JM38510/30903BEA-JM38510/30904BEA
Quad 2-to-1 Line Data Selector/Multiplexer
TL/F/6396
54LS157/DM54LS157/DM74LS157,
54LS158/DM54LS158/DM74LS158
Quad
2-Line
1-Line
Data
Selectors/Multiplexers
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
driversto supplyfull on-chip data selectiontothe fourout-
put gates.A separate strobe inputis provided.A 4-bit word selected fromoneof twosourcesandis routedtothefour
outputs.The LS157 presents true data whereasthe LS158
presents inverted datato minimize propagation delay time.
Applications Expandany data input point Multiplex dual data buses Generate four functionsof two variables (one variable common) Source programmable counters
Features Buffered inputsand outputs Typical Propagation Time
LS1579ns
LS1587ns Typical Power Dissipation
LS15749 mW
LS15824 mW Alternate Military/Aerospace device (54LS157,
54LS158)is available. Contacta National Semiconduc-
tor Sales Office/Distributorfor specifications.
Connection Diagrams
Dual-In-Line Package
TL/F/6396–1
Order Number 54LS157DMQB, 54LS157FMQB,
54LS157LMQB, DM54LS157J,DM54LS157W,
DM74LS157Mor DM74LS157N
SeeNS Package Number E20A, J16A,
M16A, N16Eor W16A
Dual-In-Line Package
TL/F/6396–2
Order Number 54LS158DMQB, 54LS158FMQB,
54LS158LMQB, DM54LS158J, DM54LS158W,
DM74LS158Mor DM74LS158N
SeeNS Package Number E20A, J16A,
M16A,N16EorW16A
Function Table
Inputs OutputY
Strobe Select A B LS157 LS158 X X L H L X L H H X H L X L L H X H H LeHigh Level,LeLow Level,Xe Don’tCare
C1995National SemiconductorCorporation RRD-B30M105/PrintedinU.S.A.
