74VHC153 Просмотр технического описания (PDF) - Fairchild Semiconductor

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74VHC153

Dual 4-Input Multiplexer

Fairchild Semiconductor 

Functional Description

Truth Table

The VHC153 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 multiplexer

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 (Za,

Zb) are forced LOW. The VHC153 is the logic implementa-

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

switch is determined by the logic levels supplied to the

Select inputs. The logic equations for the outputs are

shown below.

Select

Inputs

Inputs (a or b)

Output

S0 S1 E I0 I1 I2 I3

Z

XXHXXXX

L

L LL LXXX

L

L L LHXXX

H

HL L X LXX

L

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)

HL LXHXX

H

L HL XX L X

L

L H L XXHX

H

HHL XXX L

L

HHL XXXH

H

H = HIGH Voltage Level

L = LOW Voltage Level

X = Immaterial

Logic Diagram

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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