74ACT158PC 查看數據表（PDF） - Fairchild Semiconductor

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74ACT158PC

Quad 2-Input Multiplexer

Fairchild Semiconductor 

Functional Description

The ACT158 quad 2-input multiplexer selects four bits of

data from two sources under the control of a common

Select input (S) and presents the data in inverted form at

the four outputs. The Enable input (E) is active-LOW. When

E is HIGH, all of the outputs (Z) are forced HIGH regard-

less of all other inputs. The ACT158 is the logic implemen-

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

the switch is determined by the logic levels supplied to the

Select input.

A common use of the ACT158 is the moving of data from

two groups of registers to four common output busses. The

particular register from which the data comes is determined

by the state of the Select input. A less obvious use is as a

function generator. The ACT158 can generate four func-

tions of two variables with one variable common. This is

useful for implementing gating functions.

Logic Diagram

Truth Table

Inputs

E

S

I0

H

X

X

L

L

L

L

L

H

L

H

X

L

H

X

H = HIGH Voltage Level

L = LOW Voltage Level

X = Immaterial

Outputs

I1

Z

X

H

X

H

X

L

L

H

H

L

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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