CD74AC251 Datasheet, PDF (2/8 Pages) Texas Instruments – 8-Input Multiplexer, Three-State

CD74AC251, CD74ACT251
Functional Diagram
THREE-STATE
DISABLE OE
CHANNEL
INPUTS
DATA
SELECT
I₀ ⁴
I₁ ³
2
I₂
1
I₃
15
I₄
14
I₅
13
I_{6 12}
I₇
11
S₀
10
S₁
9
S₂
7
5
Y
6 ^OUTPUTS
Y
TRUTH TABLE
INPUTS
OUTPUTS
SELECT
S2 S1 S0 OUTPUT ENABLE OE Y
Y
X
X
X
H
Z
Z
L
L
L
L
I₀
I₀
L
L
H
L
I₁
I₁
L
H
L
L
I₂
I₂
L
H
H
L
I₃
I₃
H
L
L
L
I₄
I₄
H
L
H
L
I₅
I₅
H
H
L
L
I₆
I₆
H
H
H
L
I₇
I₇
H = High logic level, L = Low logic level, Z = High impedance (off),
X = Irrelevant, I₀, I₁...I₇ = The level of the respective input
2