HD74AC153 查看數據表（PDF） - Renesas Electronics

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HD74AC153

Dual 4-Input Multiplexer

Renesas Electronics 

HD74AC153

Logic Symbol

Ea I0a I1a I2a I3a I0b I1b I2b I3b Eb

S0

S1

Za

Zb

Pin Names

I0a to I3a

I0b to I3b

S0, S1

Ea

Eb

Za

Zb

Side A Data Inputs

Side B Data Inputs

Common Select Inputs

Side A Enable Input

Side B Enable Input

Side A Output

Side B Output

Functional Description

The HD74AC153 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 HD74AC153 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 two 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

X

S1

X

E

H

L

L

L

L

L

L

H

L

L

H

L

L

L

H

L

L

H

L

H

H

L

H

H

L

H : High Voltage Level

L : Low Voltage Level

X : Immaterial

I0

X

L

H

X

X

X

X

X

X

Input (a or b)

I1

X

I2

X

X

X

X

X

L

X

H

X

X

L

X

H

X

X

X

X

I3

X

X

X

X

X

X

X

L

H

Output

Z

L

L

H

L

H

L

H

L

H

Rev.2.00, Jul.16.2004, page 2 of 6

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