The SN74HCS157-Q1 is a high speed silicon gate CMOS multiplexer well suited to multiplexing and data routing applications. It contains four 2:1 multiplexers.

The SN74HCS157-Q1 operates asynchronously, with each Y output being equal to the input selected by the address input (A/B). All four channels are controlled by the same address input.

The strobe (G) input forces all Y outputs low, regardless of the state of other inputs.

All inputs include Schmitt-triggers allowing for slow input transitions and providing additional noise margin.