Part Number : 74HC257
Function : Quad 2-input Multiplexer, 3-state
Package : DIP, SO, SSOP, TSSOP 16 Pin Type
Maker : NXP Semiconductors.
Pinouts : 
Description :
The 74HC257, 74HCT257 are high-speed Si-gate CMOS devices and are pin compatible
with Low-power Schottky TTL (LSTTL). The 74HC257 and 74HCT257 have four identical 2-input multiplexers with 3-state outputs, which select 4 bits of data from two sources and are controlled by a common data select input (S).
The data inputs from source 0 (1I0 to 4I0) are selected when input S is LOW and the data
inputs from source 1 (1I1 to 4I1) are selected when S is HIGH. Data appears at the
outputs (1Y to 4Y) in true (non-inverting) form from the selected inputs.
The 74HC257 and 74HCT257 are 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 OEis HIGH.
Features :
1. Non-inverting data path
2. 3-state outputs interface directly with system bus
3. Complies with JEDEC standard no. 7A
4. ESD protection:
(1) HBM JESD22-A114E exceeds 2000 V
(2) MM JESD22-A115-A exceeds 200 V
Datasheet PDF Download : 
Others datasheet of same file :
74257, 74HC257D, 74HC257DB, 74HC257N, 74HC257PW
