TI SN74HC257N Quad 2-input multiplexer 3-state DIL16

Manufactured by Texas Instruments - DIP16 through hole package

The 74HC257 is the logic implementation of a 4-pole, 2-position switch, where the position of the switch is determined by the logic levels applied to S. The outputs are forced to a high-impedance OFF-state when ¬OE is HIGH.