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54ACT251L View Datasheet(PDF) - National ->Texas Instruments

Part NameDescriptionManufacturer
54ACT251L 8-Input Multiplexer with TRI-STATE® Output National-Semiconductor
National ->Texas Instruments National-Semiconductor
54ACT251L Datasheet PDF : 10 Pages
1 2 3 4 5 6 7 8 9 10
Connection Diagrams
Pin Assignment
for DIP and Flatpak
DS100284-3
Pin Assignment
for LCC
DS100284-4
Functional Description
This device is a logical implementation of a single-pole,
8-position switch with the switch position controlled by the
state of three Select inputs, S0, S1, S2. Both true and
complementary outputs are provided. The Output Enable in-
put ( OE) is active LOW. When it is activated, the logic func-
tion provided at the output is:
Z = OE (I0 S0 S1 S2 + I1S0 S1 S 2 +
I2 S0 S 1 S2 + I3 S 0 S1 S2 +
I4 S0 S1 S2 + I5 S 0 S1 S2 +
I6 S0 S 1 S2 + I7 S0 S1 S2)
When the Output Enable is HIGH, both outputs are in the
high impedance (High Z) state. This feature allows multi-
plexer expansion by tying the outputs of up to 128 devices
together. When the outputs of the TRI-STATE devices are
tied together, all but one device must be in the high imped-
ance state to avoid high currents that would exceed the
maximum ratings. The Output Enable signals should be de-
signed to ensure there is no overlap in the active-LOW por-
tion of the enable voltages.
Truth Table
Inputs
OE
S2
S1
S0
H
X
X
X
L
L
L
L
L
L
L
H
L
L
H
L
L
L
H
H
L
H
L
L
L
H
L
H
L
H
H
L
L
H
H
H
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
Outputs
Z
Z
Z
Z
I0
I0
I1
I1
I2
I2
I3
I3
I4
I4
I5
I5
I6
I6
I7
I7
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