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National Semiconductor Electronic Components Datasheet

54ACT158 Datasheet

Quad 2-Input Multiplexer

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54ACT158 pdf
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July 1998
54AC158 54ACT158
Quad 2-Input Multiplexer
General Description
The ’AC/’ACT158 is a high-speed quad 2-input multiplexer. It
selects four bits of data from two sources using the common
Select and Enable inputs. The four buffered outputs present
the selected data in the inverted form. The ’AC/’ACT158 can
also be used as a function generator.
n Outputs source/sink 24 mA
n ’ACT158 has TTL-compatible inputs
n Standard Microcircuit Drawing (SMD)
— ’AC158: 5962-89729
— ’ACT158: 5962-88755
Features
n ICC reduced by 50%
Logic Symbols
Connection Diagrams
Pin Assignment
for DIP and Flatpak
IEE/IEC
DS100273-1
DS100273-3
Pin Assignment
for LCC
DS100273-2
Pin Names
I0a– I0d
I1a–I 1d
E
S
Za– Zd
Description
Source 0 Data Inputs
Source 1 Data Inputs
Enable Input
Select Input
Inverted Outputs
FACTis a trademark of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS100273
DS100273-4
www.national.com


National Semiconductor Electronic Components Datasheet

54ACT158 Datasheet

Quad 2-Input Multiplexer

No Preview Available !

54ACT158 pdf
Functional Description
The ’AC/’ACT158 quad 2-input multiplexer selects four bits
of data from two sources under the control of a common Se-
lect input (S) and presents the data in inverted form at the
four outputs. The Enable input (E) is active-LOW. When E is
HIGH, all of the outputs (Z) are forced HIGH regardless of all
other inputs. The ’AC/’ACT158 is the logic implementation of
a 4-pole, 2-position switch where the position of the switch is
determined by the logic levels supplied to the Select input.
A common use of the ’AC/’ACT158 is the moving of data
from two groups of registers to four common output busses.
The particular register from which the data comes is deter-
mined by the state of the Select input. A less obvious use is
as a function generator. The ’AC/’ACT158 can generate four
functions of two variables with one variable common. This is
useful for implementing gating functions.
Logic Diagram
Truth Table
Inputs
ES
HX
I0
X
LL
L
LL
H
LH
X
LH
X
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Outputs
I1 Z
XH
XH
XL
LH
HL
DS100273-5
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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2


Part Number 54ACT158
Description Quad 2-Input Multiplexer
Maker National Semiconductor
Total Page 8 Pages
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