74VHC153MTC(2007) データシートの表示（PDF） - Fairchild Semiconductor

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74VHC153MTC
(Rev.:2007)

Dual 4-Input Multiplexer

Fairchild Semiconductor 

Logic Symbols

IEEC/IEC

Functional Description

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 multi-

plexer circuits have individual active-LOW Enables (Ea,

Eb) which can be used to strobe the outputs indepen-

dently. When the Enables (Ea, Eb) are HIGH, the corre-

sponding outputs (Za, Zb) are forced LOW. The VHC153 is

the logic implementation 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.

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)

Truth Table

Select

Inputs

S0 S1

XX

LL

LL

HL

Inputs (a or b)

E I0 I1 I2 I3

HXXXX

L LXXX

LHXXX

LXLXX

Output

Z

L

L

H

L

HL LXHXX

H

LHLXXLX

L

L H L XXHX

H

HHL XXX L

L

HHL XXXH

H

H = HIGH Voltage Level

L = LOW Voltage Level

X = Immaterial

©1993 Fairchild Semiconductor Corporation

74VHC153 Rev. 1.2

2

www.fairchildsemi.com

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