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SN54ALS138A, SN54AS138, SN74ALS138A, SN74AS138

3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS

SDAS055E – APRIL 1982 – REVISED JULY 1996

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

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 1 20 19

9 10 11 12 13

G2A

G2B

SN54ALS138A, SN54AS138 . . . FK PACKAGE

(TOP VIEW)

Y5 Y0

GND

NC – No internal connection

VCC

G2A

G2B

GND

VCC

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.

SN54ALS138A, SN54AS138, SN74ALS138A, SN74AS138

3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS

SDAS055E – APRIL 1982 – REVISED JULY 1996

2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

FUNCTION TABLE

INPUTS

OUTPUTS

ENABLE SELECT

OUTPUTS

G1 G2A G2B C B A Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7

X H X X X X H H H H H H H H

X X H X X X H H H H H H H H

L X X X X X H H H H H H H H

H L L L L L L H H H H H H H

H L L L L H H L H H H H H H

H L L L H L H H L H H H H H

H L L L H H H H H L H H H H

H L L H L L H H H H L H H H

H L L H L H H H H H H L H H

H L L H H L H H H H H H L H

HL LHHHHHHHHHHL

logic symbols (alternatives)†

BIN/OCT

DMUX

G2A

G2B

G2A

G2B

†These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.

Pin numbers shown are for the D, J, and N packages.

SN54ALS138A, SN54AS138, SN74ALS138A, SN74AS138

3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS

SDAS055E – APRIL 1982 – REVISED JULY 1996

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

logic diagram (positive logic)

G2B

G2A

Data

Outputs

Select

Inputs

Enable

Inputs

Pin numbers shown are for the D, J, and N packages.

Produktspecifikationer

Varumärke:	Texas Instruments
Kategori:	Inte kategoriserad
Modell:	SN74ALS138AN
Enhetsplacering:	Vrijstaand
Typ av operation:	Buttons, Rotary
Färg på produkten:	Wit
Dörrgångjärn:	Links
Inbyggd display:	Ja
Timer:	Ja
Bredd:	600 mm
Djup:	600 mm
Höjd:	850 mm
Typ av laddare:	Voorbelading
Fördröjd starttimer:	Ja
Indikering av återstående tid:	Ja
Barnlås:	Ja
Energieffektivitetsklass (gammal):	A+++
Strömförsörjning:	230VAC
Tvätt energiförbrukning:	- kWu
Vattenförbrukning per cykel:	- l
Var klass:	A
Centrifuger läkemedelsklass:	A
Justerbar centrifughastighet:	Ja
Maximal centrifugeringshastighet:	1400 RPM
Nuvarande:	10 A
AquaStop-funktion:	Ja
Minsta centrifugeringshastighet:	400 RPM
Sköljstopp:	Ja
Mått (B x D x H):	600 x 600 x 850 mm
Nominell kapacitet:	7 kg
Wasprogramma's:	Hygiene/anti-allergy, Black