Texas Instruments SN74ALS138AN Handleiding

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SN54ALS138A, SN54AS138, SN74ALS138A, SN74AS138

3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS

SDAS055E – APRIL 1982 – REVISED JULY 1996

1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

Designed Specically for High-Speed

Memory Decoders and Data Transmission

Systems

Incorporate Three Enable Inputs to Simplify

Cascading and/or Data Reception

Package Options Include Plastic

Small-Outline (D) Packages, Ceramic Chip

Carriers (FK), and Standard Plastic (N) and

Ceramic (J) 300-mil DIPs

description

The ′ALS138A and ′AS138 are 3-line to 8-line

decoders/demultiplexers designed for high-

performance memory-decoding or data-routing

applications requiring very short propagation

delay times. In high-performance systems, these

devices can be used to minimize the eects of

system decoding. When employed with

high-speed memories with a fast enable circuit,

the delay times of the decoder and the enable time

of the memory are usually less than the typical

access time of the memory. The eective system

delay introduced by the Schottky-clamped system

decoder is negligible.

The conditions at the binary-select (A, B, and C)

inputs and the three enable (G1, G2A, and G2B)

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.

The SN54ALS138A and SN54AS138 are characterized for operation over the full military temperature range

of –55°C to 125C to 70C.°C. The SN74ALS138A and SN74AS138 are characterized for operation from 0° °

Copyright  1996, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

SN54ALS138A, SN54AS138 . . . J PACKAGE

SN74ALS138A, SN74AS138 . . . D OR N PACKAGE

(TOP VIEW)

3 2 12019

9101112 13

4

5

6

7

8

18

17

16

15

14

Y1

Y2

NC

Y3

Y4

C

G2A

NC

G2B

G1

SN54ALS138A, SN54AS138 . . . FK PACKAGE

(TOP VIEW)

B

A

NC

Y6

Y5 Y0

Y7

GND

NC

NC – No internal connection

VCC

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

A

B

C

G2A

G2B

G1

Y7

GND

VCC

Y0

Y1

Y2

Y3

Y4

Y5

Y6

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.

Product specificaties