CD74AC257 Datasheet, PDF (2/8 Pages) Texas Instruments – Quad 2-Input Multiplexer with Three-State Outputs

CD74AC257, CD74ACT257, CD74ACT258
Functional Diagram
2
1I₀
5
2I₀
11
3I₀
14
4I₀
3
1I₁
6
2I₁
10
3I₁
13
4I₁
S
OE
1 15
AC/ACT AC/ACT
257 258
4
1Y
1Y
7
2Y
2Y
9
3Y
3Y
12
4Y
4Y
TRUTH TABLE
OUTPUT
ENABLE
SELECT
INPUT
DATA INPUTS
257
OUTPUTS
258
OUTPUTS
OE
S
I₀
I₁
Y
Y
H
X
X
X
Z
Z
L
L
L
X
L
H
L
L
H
X
H
L
L
H
X
L
L
H
L
H
X
H
H
L
H = High level voltage, L = Low level voltage, Z = High impedance (off) state, X = Don’t Care
2