74AC151SC 데이터 시트보기 (PDF) - Fairchild Semiconductor
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74AC151SC Datasheet PDF : 9 Pages
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Truth Table
Functional Description
Inputs
Outputs
The AC/ACT151 is a logic implementation of a single pole,
8-position switch with the switch position controlled by the
E
S2
S1
S0
Z
H
X
X
X
H
Z
state of three Select inputs, S0, S1, S2. Both true and com-
plementary outputs are provided. The Enable input (E) is
L
active LOW. When it is not activated, the complementary
L
L
L
L
I0
I0
output is HIGH and the true output is LOW regardless of all
other inputs. The logic function provided at the output is:
L
L
L
H
I1
I1
Z = E • (I0 • S0 • S1 • S2 + I1 • S0 • S1 • S2 +
L
L
H
L
I2
I2
I2 • S0 • S1 • S2 + I3 • S0 • S1 • S2 + I4 • S0 • S1 • S2 + I5 •
L
L
H
H
I3
I3
S0 • S1 • S2 + I6 • S0 • S1 • S2 + I 7 • S0 • S1 • S2)
L
H
L
L
I4
I4
The AC/ACT151 provides the ability, in one package, to
select from eight sources of data or control information. By
L
H
L
H
I5
I5
proper manipulation of the inputs, the AC/ACT151 can pro-
L
H
H
L
I6
I6
vide any logic function of four variables and its comple-
ment.
L
H
H
H
I7
I7
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Logic Diagram
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
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