54ACT11138, 74ACT11138

3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS

SCAS050A – D3266, JANUARY 1989 – REVISED APRIL 1993

POST OFFICE BOX 655303

Copyright

2–1

Memory Decoders and Data Transmission

Systems

Simplify Cascading and/or Data Reception

PCB Layout

Minimize High-Speed Switching Noise

CMOS) 1-

mm Process

at 125

°C

Small-Outline Packages, Plastic Thin

Shrink Small-Outline Packages, Ceramic

Chip Carriers, and Standard Plastic and

Ceramic 300-mil DIPs

description

The

′ACT11138 circuit is designed to be used in

high-performance memory-decoding or data-

routing

applications

requiring

very

short

propagation delay times.

In high-performance

memory systems, this decoder 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 this decoder

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 decoder is negligible.

The conditions at the binary select inputs and the three enable inputs select one of eight input 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 54ACT11138 is characterized for operation over the full military temperature range of – 55

°C to 125°C. The

74ACT11138 is characterized for operation from – 40

°C to 85°C.

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

Y1

Y2

Y3

GND

Y4

Y5

Y6

Y7

Y0

A

B

C

G1

G2A

G2B

(TOP VIEW)

54ACT11138 ...J PACKAGE

74ACT11138 . . . D, N, OR PW PACKAGE

3

2

1 20 19

910 11 12 13

4

5

6

7

8

18

17

16

15

14

G2A

G2B

NC

Y7

Y6

A

Y0

NC

Y1

Y2

54ACT11138 . . . FK PACKAGE

(TOP VIEW)

NC – No internal connection

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.

EPIC is a trademark of Texas Instruments Incorporated.