HD74AC138/HD74ACT138
1-of-8 Decoder/Demultiplexer
REJ03D0248–0200Z
(Previous ADE-205-368 (Z))
Rev.2.00
Jul.16.2004
Description
The HD74AC138/HD74ACT138 is a high-speed 1-of-8 decoder/demultiplexer. This device is ideally suited for high-
speed bipolar memory chip select address decoding. The multiple input enables allow parallel expansion to a 1-of-24
decoder using just three HD74AC138/HD74ACT138 devices or a 1-of-32 decoder using four
HD74AC138/HD74ACT138 devices and one inverter.
Features
•
•
•
•
•
Demultiplexing Capability
Multiple Input Enable for Easy Expansion
Active LOW Mutually Exclusive Outputs
Outputs Source/Sink 24 mA
HD74ACT138 has TTL-Compatible Inputs
•
Ordering Information: Ex. HD74AC138
Part Name
HD74AC138AP
Package Type
DIP-16 pin
Package Code Package Abbreviation Taping Abbreviation (Quantity)
DP-16E, -16FV
P
—
HD74AC138AFPEL SOP-16 pin (JEITA) FP-16DAV
HD74AC138ARPEL SOP-16 pin (JEDEC) FP-16DNV
FP
RP
T
EL (2,000 pcs/reel)
EL (2,500 pcs/reel)
ELL(2,000 pcs/reel)
HD74AC138TELL TSSOP-16 pin
TTP-16DAV
Notes: 1. Please consult the sales office for the above package availability.
2. The packages with lead-free pins are distinguished from the conventional products by adding V at the end of
the package code.
Pin Arrangement
1
2
3
4
5
6
7
8
16 VCC
A
A
A
E
E
E
O
0
1
2
1
2
3
7
15 O
0
1
2
3
4
5
14
13
O
O
12 O
11 O
10 O
GND
9
O
6
(Top view)
Rev.2.00, Jul.16.2004, page 1 of 9