SN74F257N
Manufacturers：
Texas Instruments
Description：
IC QUAD 2-1 DATA SEL/MUX 16-DIP
SN74F257NE4
Manufacturers：
Texas Instruments
Description：
IC SELECTOR MUX QUAD 2-1 16-DIP
SN74F257NSR
Manufacturers：
Texas Instruments
Description：
IC SELECTOR/MUX QD 2X1 3ST 16SO