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74LVQ157SJ датащи(PDF) 2 Page - Fairchild Semiconductor

номер детали 74LVQ157SJ
подробное описание детали  Low Voltage Quad 2-Input Multiplexer
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производитель  FAIRCHILD [Fairchild Semiconductor]
домашняя страница  http://www.fairchildsemi.com
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74LVQ157SJ датащи(HTML) 2 Page - Fairchild Semiconductor

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Truth Table
Inputs
Outputs
E
SI
0
I
1
Z
HX
X
X
L
LH
X
L
L
LH
X
H
H
LL
L
X
L
LL
H
X
H
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Functional Description
The LVQ157 is a quad 2-input multiplexer. It selects four bits
of data from two sources under the control of a common Se-
lect 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 LVQ157 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:
Z
a = E • (I1a • S+I0a • S)
Z
b = E • (I1b • S+I0b • S)
Z
c = E • (I1c • S+I0c • S)
Z
d = E • (I1d • S+I0d • S)
A common use of the LVQ157 is the moving of data from two
groups of registers to four common output busses. The par-
ticular register from which the data comes is determined by
the state of the Select input. A less obvious use is as a func-
tion generator. The LVQ157 can generate any four of the six-
teen different functions of two variables with one variable
common. This is useful for implementing gating functions.
Logic Diagram
DS011352-5
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


Аналогичный номер детали - 74LVQ157SJ

производительномер деталидатащиподробное описание детали
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Аналогичное описание - 74LVQ157SJ

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