© 2003 Fairchild Semiconductor Corporation

DS009925

www.fairchildsemi.com

November 1988

Revised July 2003

74AC138 • 74ACT138

1-of-8 Decoder/Demultiplexer

General Description

The AC/ACT138 is a high-speed 1-of-8 decoder/demulti-

plexer. 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 AC/ACT138 devices or a 1-of-32 decoder

using four AC/ACT138 devices and one inverter.

Features

■ Demultiplexing capability

■ Multiple input enable for easy expansion

■ Active LOW mutually exclusive outputs

■ Outputs source/sink 24 mA

■ ACT138 has TTL-compatible inputs

Ordering Code:

Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.

Connection Diagram

Pin Descriptions

Logic Symbols

IEEE/IEC

FACT

™ is a trademark of Fairchild Semiconductor Corporation.

Order Number

Package Number

Package Description

74AC138SC

M16A

16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow

74AC138SJ

M16D

16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

74AC138MTC

MTC16

16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

74AC138PC

N16E

16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide

74ACT138SC

M16A

16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow

74ACT138SJ

M16D

16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

74ACT138PC

N16E

16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide

Pin Names

Description

Address Inputs

Enable Inputs

Enable Input

Outputs