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National Semiconductor |
www.DataSheet4U.com
August 1998
54AC151 • 54ACT151
8-Input Multiplexer
General Description
The ’AC/’ACT151 is a high-speed 8-input digital multiplexer.
It provides, in one package, the ability to select one line of
data from up to eight sources. The ’AC/’ACT151 can be used
as a universal function generator to generate any logic func-
tion of four variables. Both true and complementary outputs
are provided.
Features
n ICC reduced by 50%
n Outputs source/sink 24 mA
n ’ACT151 has TTL-compatible inputs
n Standard Microcircuit Drawing (SMD)
— ’AC151: 5962-87691
— ’ACT151: 5962-88756
Ordering Code:
Logic Symbols
IEEE/IEC
DS100270-1
Pin
Names
I0– I7
S0– S2
E
Z
Z
Description
Data Inputs
Select Inputs
Enable Input
Data Output
Inverted Data Output
DS100270-6
FACT® is a registered trademark of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS100270
www.national.com
Connection Diagrams
Pin Assignment
for DIP and Flatpak
Pin Assignment
for LCC
Truth Table
Inputs
E S2 S1
HX
X
LL
L
LL
L
LL
H
LL
H
LH
L
LH
L
LH
H
LH
H
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
DS100270-2
Outputs
S0 Z
XH
Z
L
L I0 I0
H I1 I1
L I2 I2
H I3 I3
L I4 I4
H I5 I5
L I6 I6
H I7 I7
DS100270-3
Functional Description
The ’AC/’ACT151 is a logic implementation of a single pole,
8-position switch with the switch position controlled by the
state of three Select inputs, S0, S1, S2. Both true and
complementary outputs are provided. The Enable input (E) is
active LOW. When it is not activated, the complementary
output is HIGH and the true output is LOW regardless of all
other inputs. The logic function provided at the output is:
Z = E • (I0 • S0 • S1 • S2 + I1 • S0 • S1 • S2 +
I2 • S0 • S1 • S2 + I3 • S0 • S1 • S2 + I4 • S0 • S1 • S2 +
I5 • S0 • S1 • S2 + I6 • S0 • S1 • S2 + I7 • S0 • S1 • S2)
The ’AC/’ACT151 provides the ability, in one package to se-
lect from eight sources of data or control information. By
proper manipulation of the inputs, the ’AC/’ACT151 can pro-
vide any logic function of four variables and its complement.
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