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

Part Name54ACT251L National-Semiconductor
National ->Texas Instruments National-Semiconductor
Description8-Input Multiplexer with TRI-STATE® Output
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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General Description
The ’AC/’ACT251 is a high-speed 8-input digital multiplexer. It provides, in one package, the ability to select one bit of data from up to eight sources. It can be used as universal function generator to generate any logic function of four variables. Both true and complementary outputs are provided.

Features
■ ICC reduced by 50%
■ Multifunctional capability
■ On-chip select logic decoding
■ Inverting and noninverting TRI-STATE outputs
■ Outputs source/sink 24 mA
■ ’ACT251 has TTL-compatible inputs
■ Standard Military Drawing (SMD)
   — ’AC251: 5962-87692
   — ’ACT251: 5962-89599

 

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