Quad 2-Input Data Selector/Multiplexer With 3-State Outputs

The IN74AC257 is identical in pinout to the LS/ALS257, HC/HCT257. The device inputs are compatible with standard CMOS outputs; with pullup resistors, they are compatible with LS/ALS outputs. This device selects a (4-bit) nibble from either the A or B inputs as determined by the Select input. The nibble is presented at the outputs in noninverted from when the Output Enable pin is at a low level. A high level on the Output Enable pin switches the outputs into the high-impedance state. By Integral Corp.
IN74AC257 's PackagesIN74AC257 's pdf datasheet

IN74AC257 Pinout, Pinouts
IN74AC257 pinout,Pin out
This is one package pinout of IN74AC257,If you need more pinouts please download IN74AC257's pdf datasheet.

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