74ACTQ153SCX(2001) Ver la hoja de datos (PDF) - Fairchild Semiconductor

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74ACTQ153SCX
(Rev.:2001)

Quiet Series Dual 4-Input Multiplexer

Fairchild Semiconductor 

Functional Description

The ACTQ153 is a dual 4-input multiplexer. It can select

two bits of data from up to four sources under the control of

the common Select inputs (S0, S1). The two 4-input multi-

plexer circuits have individual active-LOW Enables (Ea, Eb)

which can be used to strobe the outputs independently.

When the Enables (Ea, Eb) are HIGH, the corresponding

outputs (Az, Zb) are forced LOW. The ACTQ153 is the logic

implementation of a 2-pole, 4-position switch, where the

position of the switch is determined by the logic levels sup-

plied to the Select inputs. The logic equations for the out-

puts are shown below.

Za = Ea • (I0a • S1 • S0 + I1a • S1 • S0 +

I2a • S1 •S0 + I3a • S1 • S0)

Zb = Eb • (I0b • S1 • S0 • I1b • S1 • S0 +

I2b • S1 • S0 +I3b • S1 • S0)

Logic Diagram

Truth Table

Select

Inputs

S0 S1 E

XXH

LLL

LLL

HLL

HLL

LHL

LHL

HHL

HHL

H = HIGH Voltage Level

L = LOW Voltage Level

X = Immaterial

Inputs (a or b)

I0

I1

I2

XXX

L XX

HXX

XLX

XHX

XXL

XXH

XXX

XXX

Outputs

I3

Z

X

L

X

L

X

H

X

L

X

H

X

L

X

H

L

L

H

H

Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.

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