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74LS157 pdf datasheet

消耗积分:5 | 格式:rar | 大小:133 | 2008-08-06

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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 output
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 Semiconductor
Sales Office/Distributor for specifications.
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