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54AC258 Arkusz danych(PDF) 3 Page - Texas Instruments

Numer części 54AC258
Szczegółowy opis  Quad 2-Input Multiplexer with TRI-STATE Outputs
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI1 - Texas Instruments

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Connection Diagrams
Functional Description
The ’AC/’ACT258 is a quad 2-input multiplexer with
TRI-STATE outputs. It selects four bits of data from two
sources under control of a common Select input (S). When
the Select input is LOW, the I
0x inputs are selected and when
Select is HIGH, the I
1x inputs are selected. The data on the
selected inputs appears at the outputs in inverted form. The
’AC/’ACT258 is the logic implementation of a 4-pole,
2-position switch where the position of the switch is deter-
mined by the logic levels supplied to the Select input. The
logic equations for the outputs are shown below:
Z
a = OE • (I1a • S+I0a • S)
Z
b = OE • (I1b • S+I0b • S)
Z
c = OE • (I1c • S+I0c • S)
Z
d = OE • (I1d • S+I0d • S)
When the Output Enable input (OE) is HIGH, the outputs are
forced to a high impedance state. If the outputs of the
TRI-STATE devices are tied together, all but one device must
be in the high impedance state to avoid high currents that
would exceed the maximum ratings. Designers should en-
sure that Output Enable signals to TRI-STATE devices
whose outputs are tied together are designed so there is no
overlap.
Truth Table
Output
Select
Data
Outputs
Enable
Input
Inputs
OE
SI
0
I
1
Z
HX
X
X
Z
LH
X
L
H
LH
X
H
L
LL
L
X
H
LL
H
X
L
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
Pin Assignment
for DIP and Flatpak
DS100287-3
Pin Assignment
for LCC
DS100287-4
www.national.com
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