HD74AC138 View Datasheet(PDF) - Hitachi -> Renesas Electronics

Part Name

Description

Manufacturer

HD74AC138

1-of-8 Decoder/Demultiplexer

Hitachi -> Renesas Electronics 

HD74AC138/HD74ACT138

Logic Diagram

A2 A1 A0

E1 E2 E3

O7 O6 O5 O4 O3 O2 O1 O0

Please note that this diagram is provided only for the understanding of logic operations and should not be

used to estimate propagation delays.

Figure a: Expansion of 1-of-32 Decoding

A0

A1

A2

A3

A4

A0 A1 A2

H

123

E

123

A0 A1 A2

E

123

A0 A1 A2

E

’04

123

A0 A1 A2

E

O0 O1 O2 O3O4 O5 O6 O7

O0 O1 O2 O3O4 O5 O6 O7

O0 O1 O2 O3O4 O5 O6 O7

O0 O1 O2 O3O4 O5 O6 O7

O0

O31

4

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