1

Data sheet acquired from Harris Semiconductor

SCHS234A

Features

• ’AC138, ’ACT138. . . . . . . . . . . . . . . . . . . . . . . . Inverting

• CD74AC238, CD74ACT238 . . . . . . . . . . . Non-Inverting

• Buffered Inputs

• Typical Propagation Delay

• Exceeds 2kV ESD Protection MIL-STD-883, Method

3015

• SCR-Latchup-Resistant CMOS Process and Circuit

Design

• Speed of Bipolar FAST™/AS/S with Significantly

Reduced Power Consumption

• Balanced Propagation Delays

• AC Types Feature 1.5V to 5.5V Operation and

Balanced Noise Immunity at 30% of the Supply

•

±24mA Output Drive Current

- Fanout to 15 FAST™ ICs

- Drives 50

Ω Transmission Lines

Pinout

CD54AC138, CD54ACT138

(CERDIP)

CD74AC138, CD74ACT138, CD74AC238, CD74ACT238

(PDIP, SOIC)

TOP VIEW

Description

The ’AC138, ’ACT138, CD74AC238, and CD74ACT238 are

3-to-8-line decoders/demultiplexers that utilize Advanced

CMOS Logic technology. Both circuits have three binary

select inputs (A0, A1, and A2). If the device is enabled, these

inputs determine which one of the eight normally HIGH out-

puts of the AC/ACT138 will go LOW or which on of the nor-

mally LOW outputs of the AC/ACT238 will go HIGH. Two

active LOW and one active HIGH enables (E1, E2 and E3)

are provided to simplify the cascading of these devices.

14

15

16

9

13

12

11

10

1

2

3

4

5

7

6

8

A0

A1

A2

E1

E2

E3

GND

AC/ACT138 Y7

Y1 AC/ACT138

Y2 AC/ACT138

Y3 AC/ACT138

Y4 AC/ACT138

Y5 AC/ACT138

Y6 AC/ACT138

Y0 AC/ACT138

AC/ACT238 Y7

Y0 AC/ACT238

Y1 AC/ACT238

Y2 AC/ACT238

Y3 AC/ACT238

Y4 AC/ACT238

Y5 AC/ACT238

Y6 AC/ACT238

Ordering Information

PART

NUMBER

TEMP.

PACKAGE

CD54AC138F3A

-55 to 125

16 Ld CERDIP

CD74AC138E

-55 to 125

16 Ld PDIP

CD74AC138M

-55 to 125

16 Ld SOIC

CD54ACT138F3A

-55 to 125

16 Ld CERDIP

CD74ACT138E

-55 to 125

16 Ld PDIP

CD74ACT138M

-55 to 125

16 Ld SOIC

CD74AC238E

-55 to 125

16 Ld PDIP

CD74AC238M

-55 to 125

16 Ld SOIC

CD74ACT238E

-55 to 125

16 Ld PDIP

CD74ACT238M

-55 to 125

16 Ld SOIC

NOTES:

1. When ordering, use the entire part number. Add the suffix 96 to

obtain the variant in the tape and reel.

2. Wafer and die for this part number is available which meets all elec-

trical specifications. Please contact your local TI sales office or cus-

tomer service for ordering information.

September 1998 - Revised May 2000

CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.

FAST™ is a Trademark of Fairchild Semiconductor.

Copyright

CD54/74AC138, CD54/74ACT138,

CD74AC238, CD74ACT238

3-to-8-Line Decoders/Demultiplexers

[ /Title

(CD74

AC138

,

CD74

ACT13

8,

CD74

AC238

,

CD74

ACT23

8)

/Sub-

ject (3-

to-8-

Line

Decod-

ers/De

multi-

plex-

ers)

/Autho

r ()

/Key-

words

(Har-

ris

Semi-

con-

ductor,

Advan

ced