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54ACT158F Datasheet(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza 54ACT158F
Descripción Electrónicos  Quad 2-Input Multiplexer
Download  8 Pages
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

54ACT158F Datasheet(HTML) 2 Page - National Semiconductor (TI)

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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.
Truth Table
Inputs
Outputs
E
SI
0
I
1
Z
HX
X
X
H
LL
L
X
H
LL
H
X
L
LH
X
L
H
LH
X
H
L
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Logic Diagram
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.
www.national.com
2


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