1

Standard Products

UT54ACS138/UT54ACTS138

3-Line to 8-Line Decoders/Demultiplexers

Datasheet

November 2010

www.aeroflex.com/logic

FEATURES

1.2μ CMOS

- Latchup immune

High speed

Low power consumption

Single 5 volt supply

Available QML Q or V processes

Flexible package

- 16-pin DIP

- 16-lead flatpack

UT54ACS138 - SMD 5962-96544

UT54ACTS138 - SMD 5962-96545

DESCRIPTION

The UT54ACS138 and the UT54ACTS138 3-line to 8-line de-

coders/demultiplexers are designed to be used in high-perfor-

mance memory-decoding or data-routing applications requiring

very short propagation delay times.

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 of

inverters when expanding. A 24-line decoder can be implement-

ed 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.

PINOUTS

16-Pin DIP

Top View

16-Lead Flatpack

Top View

The devices are characterized over full military temperature

range of -55

°C to +125°C.

FUNCTION TABLE

1

2

3

4

5

7

6

16

15

14

13

12

10

11

A

B

C

G2A

G2B

G1

Y7

Y0

Y1

Y2

Y3

Y4

Y5

8

9

Y6

1

2

3

4

5

7

6

16

15

14

13

12

10

11

A

B

C

G2A

G2B

G1

Y7

Y0

Y1

Y2

Y3

Y4

Y5

Y6

89

ENABLE INPUTS

SELECT INPUTS

OUTPUT

G1

G2A

G2B

C

B

A

Y0

Y1

Y2

Y3

Y4

Y5

Y6

Y7

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

X

H

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

H

L

L

H

H

H

H

H

H

H

H

H

H

L