MC74ACT353 Motorola, MC74ACT353 Datasheet - Page 2

• Manufacturer Part Number: MC74ACT353
• Description: DUAL 4-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS
• Manufacturer: Motorola

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DataSheet
FUNCTIONAL DESCRIPTION
4-input multiplexers with 3-state outputs. They select two bits
from four sources selected by common Select inputs (S 0 , S 1 ).
The 4-input multiplexers have individual Output Enable (OE a ,
OE b ) inputs which, when HIGH, force the outputs to a high
impedance (High Z) state. The logic equations for the outputs
are shown below:
Z a = OE a (I 0a S 1 S 0 +I 1a S 1 S 0 +
Z b = OE b (I 0b S 1 S 0 +I 1b S 1 S 0 +
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The MC74AC353/74ACT353 contains two identical
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I 2a S 1 S 0 +I 3a S 1 S 0 )
I 2b S 1 S 0 +I 3b S 1 S 0 )
OE b
I 3b
Please note that this diagram is provided only for the understanding of logic
operations and should not be used to estimate propagation delays.
I 2b
Z b
MC74AC353 MC74ACT353
I 1b
I 0b
LOGIC DIAGRAM
FACT DATA
S 0
5-2
S 1
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 that there is
no overlap.
If the outputs of 3-state devices are tied together, all but one
I 3a
I 2a
Z a
I 1a
I 0a
OE a