SN74LS257BN
Manufacturers：
Texas Instruments
Description：
IC QUAD 2-1 DATA SEL/MUX 16-DIP
SN74LS257BNE4
Manufacturers：
Texas Instruments
Description：
IC QUAD 2-1 DATA SEL/MUX 16-DIP
SN74LS257BNSR
Manufacturers：
Texas Instruments
Description：
IC DATASELECT/MUX 2-1 QUAD 16SO