74f151a Fairchild Semiconductor, 74f151a Datasheet - Page 2

• Manufacturer Part Number: 74f151a
• Description: 74f151a 8-input Multiplexer
• Manufacturer: Fairchild Semiconductor

www.fairchildsemi.com
Functional Description
The F151A is a logic implementation of a single pole, 8-
position switch with the switch position controlled by the
state of three Select inputs, S
negation outputs are provided. The Enable input (E) is
active LOW. When it is not activated, the negation output is
HIGH and the assertion output is LOW regardless of all
other inputs. The logic function provided at the output is:
Z
The F151A provides the ability, in one package, to select
from eight sources of data or control information. By proper
manipulation of the inputs, the F151A can provide any logic
function of four variables and its negation.
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.
I
I
E • (I
3
6
S
S
2
2
0
S
S
1
1
S
2
S
S
S
0
0
1
S
I
I
4
7
0
S
S
2
2
I
S
S
1
1
1
S
S
S
2
0
0
S
)
1
0
S
I
, S
5
0
S
1
2
, S
I
2
S
1
2
S
. Both assertion and
2
S
0
S
1
S
0
2
Truth Table
H
L
X
LOW Voltage Level
HIGH Voltage Level
Immaterial
E
H
L
L
L
L
L
L
L
L
S
H
H
H
H
X
L
L
L
L
2
Inputs
S
X
H
H
H
H
L
L
L
L
1
S
X
H
H
H
H
L
L
L
L
0
H
I
I
I
I
I
I
I
I
Z
0
1
2
3
4
5
6
7
Outputs
I
I
I
I
I
I
I
I
Z
L
0
1
2
3
4
5
6
7