74AC153 查看數據表（PDF） - ON Semiconductor

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74AC153

Dual 4-Input Multiplexer

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MC74AC153, MC74ACT153

Ea I0a I1a I2a I3a I0b I1b I2b I3b Eb

S0

S1

Za

Zb

Figure 2. Logic Symbol

Ea I0a

I1a

I2a

I3a

S1

FUNCTIONAL DESCRIPTION

The MC74AC153/74ACT153 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 MC74AC153/74ACT153 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)

S0

I0b

I1b

I2b

I3b Eb

Za

Zb

NOTE:

This diagram is provided only for the understanding of logic

operations and should not be used to estimate propagation

delays.

Figure 3. Logic Diagram

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