SN54LVC138A, SN74LVC138A

3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS

SCAS291I – MARCH 1993 – REVISED OCTOBER 1998

1

POST OFFICE BOX 655303

CMOS) Submicron Process

MIL-STD-883, Method 3015; Exceeds 200 V

Using Machine Model (C = 200 pF, R = 0)

JESD 17

Small-Outline (D), Shrink Small-Outline

(DB), and Thin Shrink Small-Outline (PW)

Packages, Ceramic Chip Carriers (FK) and

Flat (W) Package, and DIPs (J)

description

The SN54LVC138A 3-line to 8-line decoder/

operation and the SN74LVC138A 3-line to 8-line

decoder/demultiplexer is designed for 1.65-V to

The ’LVC138A devices are designed for high-

performance memory-decoding or data-routing

applications requiring very short propagation

delay times. In high-performance memory systems, these decoders 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 are usually 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 enable inputs and one active-high enable input 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.

Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of these devices as translators

in a mixed 3.3-V/5-V system environment.

The SN54LVC138A is characterized for operation over the full military temperature range of –55

°C to 125°C.

The SN74LVC138A is characterized for operation from –40

°C to 85°C.

Copyright

© 1998, 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.

EPIC is a trademark of Texas Instruments Incorporated.

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2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

A

B

C

G2A

G2B

G1

Y7

GND

Y0

Y1

Y2

Y3

Y4

Y5

Y6

SN54LVC138A ...J OR W PACKAGE

SN74LVC138A . . . D, DB, OR PW PACKAGE

(TOP VIEW)

32 1 20 19

910 11 12 13

4

5

6

7

8

18

17

16

15

14

Y1

Y2

NC

Y3

Y4

C

G2A

NC

G2B

G1

SN54LVC138A . . . FK PACKAGE

(TOP VIEW)

NC – No internal connection

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.