HD74HC251 Datasheet, PDF (2/9 Pages) Hitachi Semiconductor – 1 of 8 Data Selectors/Multiplexers (with 3-state outputs)

HD74HC251
Function Table
Inputs
Select
Strobe
C
B
A
S
X
X
X
H
L
L
L
L
L
L
H
L
L
H
L
L
L
H
H
L
H
L
L
L
H
L
H
L
H
H
L
L
H
H
H
L
Notes 1. H: high level, L: low level, X: irrelevant
2. Z; high impedcance (off-state)
3. D₀ through D₇; the level of the respective D input.
Pin Arrangement
Outputs
Y
W
Z
Z
D₀
D₀
D₁
D₁
D₂
D₂
D₃
D₃
D₄
D₄
D₅
D₅
D₆
D₆
D₇
D₇
31
Data inputs
22
13
04
Outputs
Y5
W6
Strobe 7
GND 8
D₂ ^D3 D₄
D1
D5
D0
D6
Y
D7
W
A
S
B
C
16 V_CC
15 4
14 5
13 6
Data inputs
12 7
11 A
10 B Data select
9C
(Top view)
2