74LS157 Quad 2-input Multiplexer - (AD1501)

Description:

The 74LS157 is a high-speed CMOS device compatible with low-power Schottky TTL. The 74HC/HCT157 is a quad 2-input multiplexer which selects 4 bits of data from 2 sources controlled by a common data select input. The 4 outputs present the selected data in a HIGH state. The enable input E is active LOW. When E is HIGH, all outputs (1Y to 4Y) are forced to a LOW state regardless of the input conditions.

Datasheet