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74ACT157PC Datasheet(PDF) 2 Page - Fairchild Semiconductor

Part # 74ACT157PC
Description  Quad 2-Input Multiplexer
Download  9 Pages
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

74ACT157PC Datasheet(HTML) 2 Page - Fairchild Semiconductor

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Functional Description
The AC/ACT157 is a quad 2-input multiplexer. It selects
four bits of data from two sources under the control of a
common Select input (S). The Enable input (E) is active-
LOW. When E is HIGH, all of the outputs (Z) are forced
LOW regardless of all other inputs. The AC/ACT157 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. The logic equations for the
outputs are shown below:
Za = E • (I1a • S + I0a • S)
Zb = E • (I1b • S + I0b • S)
Zc = E • (I1c • S + I0c • S)
Zd = E • (I1d • S + I0d • S)
A common use of the AC/ACT157 is the moving of data
from two groups of registers to four common output bus-
ses. The particular register from which the data comes is
determined by the state of the Select input. A less obvious
use is as a function generator. The AC/ACT157 can gener-
ate any four of the sixteen different functions of two vari-
ables with one variable common. This is useful for
implementing gating functions.
Truth Table
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.
Inputs
Outputs
E
SI0
I1
Z
HX
X
X
L
LH
X
L
L
LH
X
H
H
LL
L
X
L
LL
H
X
H


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