CD74AC138, CD74ACT138,
CD74AC238, CD74ACT238
Data sheet acquired from Harris Semiconductor
SCHS234
3-to-8-Line Decoders/Demultiplexers
September 1998
Features
Description
• CD74AC138, CD74ACT138 . . . . . . . . . . . . . . . Inverting The CD74AC138, CD74ACT138, CD74AC238, and
CD74ACT238 are 3-to-8-line decoders/demultiplexers that
utilize the Harris Advanced CMOS Logic technology. Both
• CD74AC238, CD74ACT238 . . . . . . . . . . . Non-Inverting
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 outputs of the AC/ACT138 will go
LOW or which on of the normally 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.
• Buffered Inputs
• Typical Propagation Delay
o
- 5ns at V
CC
= 5V, T = 25 C, C = 50pF
A L
• Exceeds 2kV ESD Protection MIL-STD-883, Method
3015
[ /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
• SCR-Latchup-Resistant CMOS Process and Circuit
Design
Ordering Information
• Speed of Bipolar FAST™/AS/S with Significantly
Reduced Power Consumption
PART
NUMBER
TEMP.
RANGE ( C)
PKG.
NO.
o
PACKAGE
o
CD74AC138E
CD74ACT138E
CD74AC238E
CD74ACT238E
CD74AC138M
CD74ACT138M
CD74AC238M
CD74ACT238M
NOTES:
0 to 70 C, -40 to 85, 16 Ld PDIP
-55 to 125
E16.3
• Balanced Propagation Delays
• AC Types Feature 1.5V to 5.5V Operation and
Balanced Noise Immunity at 30% of the Supply
o
0 to 70 C, -40 to 85, 16 Ld PDIP
E16.3
-55 to 125
• ±24mA Output Drive Current
- Fanout to 15 FAST™ ICs
o
0 to 70 C, -40 to 85, 16 Ld PDIP
E16.3
-55 to 125
o
- Drives 50Ω Transmission Lines
0 to 70 C, -40 to 85, 16 Ld PDIP
E16.3
-55 to 125
o
0 to 70 C, -40 to 85, 16 Ld SOIC
M16.15
M16.15
M16.15
M16.15
Pinout
-55 to 125
o
0 to 70 C, -40 to 85, 16 Ld SOIC
CD74AC138, CD74ACT138, CD74AC238, CD74ACT238
-55 to 125
(PDIP, SOIC)
TOP VIEW
o
0 to 70 C, -40 to 85, 16 Ld SOIC
-55 to 125
o
0 to 70 C, -40 to 85, 16 Ld SOIC
-55 to 125
V
A0
A1
A2
E1
E2
E3
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CC
Y0 AC/ACT138
Y0 AC/ACT238
Y1 AC/ACT138
Y1 AC/ACT238
Y2 AC/ACT138
Y2 AC/ACT238
Y3 AC/ACT138
Y3 AC/ACT238
Y4 AC/ACT138
Y4 AC/ACT238
Y5 AC/ACT138
Y5 AC/ACT238
17. When ordering, use the entire part number. Add the suffix 96 to
obtain the variant in the tape and reel.
18. Wafer and die for this part number is available which meets all elec-
trical specifications. Please contact your local sales office or Harris
customer service for ordering information.
AC/ACT138 Y7
AC/ACT238 Y7
Y6 AC/ACT138
Y6 AC/ACT238
GND
Semi-
con-
ductor,
Advan
ced
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
FAST™ is a Trademark of Fairchild Semiconductor.
Copyright © Harris Corporation 1998
File Number 1909.1
1