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 DM74S157 presents true data whereas the DM74S158 presents inverted data to minimize propagation delay time.

Features

■ Buffered inputs and outputs

■ Typical propagation time

DM74S157 5 ns

DM74S158 4 ns

■ Typical power dissipation

DM74S157 250 mW

DM74S158 195 mW

Applications

• Expand any data input point

• Multiplex dual data buses

• Generate four functions of two variables (one variable is common)

• Source programmable counters