CD54ACT138, CD74ACT138

3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS

SCHS329A – JANUARY 2003 – REVISED FEBRUARY 2003

1

POST OFFICE BOX 655303

Significantly Reduced Power Consumption

Memory Decoders and Data-Transmission

Systems

Cascading and/or Data Reception

– Fanout to 15 F Devices

Circuit Design

MIL-STD-883, Method 3015

description/ordering information

The ’ACT138 decoders/demultiplexers are designed for high-performance memory-decoding and data-routing

applications that require very short propagation-delay times. In high-performance memory systems, these

decoders can be used to minimize the effects of system decoding. When employed with high-speed memories

utilizing a fast enable circuit, the delay times of these decoders and the enable time of the memory usually are

less than the typical access time of the memory. This means that the effective system delay introduced by the

decoders is negligible.

The conditions at the binary-select inputs and the three enable inputs select one of eight output lines. Two

active-low and one active-high enable inputs reduce the need for external gates or inverters when expanding.

A 24-line decoder can be implemented without external inverters, and a 32-line decoder requires only one

inverter. An enable input can be used as a data input for demultiplexing applications (see Application

Information).

ORDERING INFORMATION

TA

PACKAGE†

ORDERABLE

PART NUMBER

TOP-SIDE

MARKING

PDIP – E

Tube

CD74ACT138E

CD74ACT138E

55

°Cto125°C

SOIC

M

Tube

CD74ACT138M

ACT138M

–55

°C to 125°C

SOIC – M

Tape and reel

CD74ACT138M96

ACT138M

CDIP – F

Tube

CD54ACT138F3A

CD54ACT138F3A

† Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines

are available at www.ti.com/sc/package.

On products compliant to MIL-PRF-38535, all parameters are tested

unless otherwise noted. On all other products, production

processing does not necessarily include testing of all parameters.

Copyright

 2003, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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16

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A

B

C

G2A

G2B

G1

Y7

GND

Y0

Y1

Y2

Y3

Y4

Y5

Y6

CD54ACT138 ...F PACKAGE

CD74ACT138 ...E OR M PACKAGE

(TOP VIEW)