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MC74AC138

1-of-8 Decoder/Demultiplexer

ON Semiconductor 

MC74AC138, MC74ACT138

1-of-8

Decoder/Demultiplexer

The MC74AC138/74ACT138 is a high−speed 1−of−8

decoder/demultiplexer. This device is ideally suited for high−speed

bipolar memory chip select address decoding.

The multiple input enables allow parallel expansion to a 1−of−24

decoder using just three MC74AC138/74ACT138 devices or a

1−of−32 decoder using four MC74AC138/74ACT138 devices and one

inverter.

• Demultiplexing Capability

• Multiple Input Enable for Easy Expansion

• Active LOW Mutually Exclusive Outputs

• Outputs Source/Sink 24 mA

• ′ACT138 Has TTL Compatible Inputs

• These are Pb−Free Devices

VCC O0 O1 O2 O3 O4 O5 O6

16 15 14 13 12 11 10 9

123

A0 A1 A2

45

E1 E2

678

E3 O7 GND

Figure 1. Pinout: 16−Lead Packages Conductors

(Top View)

A0 A1 A2

E1 E2 E3

O0 O1 O2 O3 O4 O5 O6 O7

www.onsemi.com

16

1

16

1

MARKING

DIAGRAMS

16

SOIC−16

D SUFFIX

CASE 751B

1

xxx138G

AWLYWW

TSSOP−16

DT SUFFIX

CASE 948F

16

xxx

138

ALYWG

G

1

xxx

= AC or ACT

A

= Assembly Location

WL or L = Wafer Lot

Y

= Year

WW or W = Work Week

G or G = Pb−Free Package

(Note: Microdot may be in either location)

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 7 of this data sheet.

Figure 2. Logic Symbol

PIN ASSIGNMENT

PIN

FUNCTION

A0−A2

E1−E2

E3

O0−O7

Address Inputs

Enable Inputs

Enable Input

Outputs

© Semiconductor Components Industries, LLC, 2015

1

January, 2015 − Rev. 7

Publication Order Number:

MC74AC138/D

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