HD74LS251 Datasheet, PDF (2/6 Pages) Hitachi Semiconductor – 1 of 8 Data Selectors/Multiplexers(with strobe and three-state outputs)

HD74LS251
Function Table
Inputs
Select
C
B
A
X
X
X
L
L
L
L
L
H
L
H
L
L
H
H
H
L
L
H
L
H
H
H
L
H
H
H
Notes: 1. H; high level, L; low level, X; irrelevant
2. Z; high impedance (off-state)
3. D₀ through D₇; the level of the respective D input.
Strobe
S
H
L
L
L
L
L
L
L
L
Block Diagram
Strobe
(Enable)
D0
D1
D2
Data
D3
Inputs _D4
D5
D6
D7
A
Data
Select
B
(Binary)
C
A
A
B
B
C
C
Outputs
Y
W
Z
Z
D₀
D₀
D₁
D₁
D₂
D₂
D₃
D₃
D₄
D₄
D₅
D₅
D₆
D₆
D₇
D₇
Output Y
Output W
Absolute Maximum Ratings
Item
Symbol
Ratings
Unit
Supply voltage
V_CC
7
V
Input voltage
V_IN
7
V
Output voltage (off-state)
Operating temperature
V_{O (off)}
5.5
V
Topr
–20 to +75
°C
Power dissipation
Storage temperature
P_T
Tstg
400
mW
–65 to +150
°C
Note: Voltage value, unless otherwise noted, are with respect to network ground terminal.
Rev.3.00, Jul.15.2005, page 2 of 5