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74ACT258SC Fiches technique(PDF) 2 Page - Fairchild Semiconductor

No de pièce 74ACT258SC
Description  Quad 2-Input Multiplexer with 3-STATE Outputs
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Fabricant  FAIRCHILD [Fairchild Semiconductor]
Site Internet  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

74ACT258SC Fiches technique(HTML) 2 Page - Fairchild Semiconductor

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©1988 Fairchild Semiconductor Corporation
www.fairchildsemi.com
74ACT258 Rev. 1.4
2
Logic Symbol
IEEE/IEC
Truth Table
H
= HIGH Voltage Level
L
= LOW Voltage Level
X
= Immaterial
Z
= High Impedance
Functional Description
The ACT258 is a quad 2-input multiplexer with 3-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 I0x inputs are selected and
when Select is HIGH, the I1x inputs are selected. The
data on the selected inputs appears at the outputs in
inverted form. The ACT258 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 = OE • (I1a • S + I0a • S)
Zb = OE • (I1b • S + I0b • S)
Zc = OE • (I1c • S + I0c • S)
Zd = 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 3-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 ensure that Output Enable signals to
3-STATE devices whose outputs are tied together are
designed so there is no overlap.
Output
Enable
Select
Input
Data
Inputs
Outputs
OE
SI0
I1
Z
HX
X
X
Z
LH
X
L
H
LH
X
H
L


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