MC74AC138, MC74ACT138
1−of−8
Decoder/Demultiplexer
The MC74AC138/74ACT138 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 MC74AC138/74ACT138 devices or a
1−of−32decoder using four MC74AC138/74ACT138 devices and one
inverter.
http://onsemi.com
DIP−16
N SUFFIX
CASE 648
• Demultiplexing Capability
16
• Multiple Input Enable for Easy Expansion
• Active LOW Mutually Exclusive Outputs
• Outputs Source/Sink 24 mA
1
SO−16
• ′ACT138 Has TTL Compatible Inputs
D SUFFIX
CASE 751B
16
w These devices are available in Pb−free package(s). Specifications herein
apply to both standard and Pb−free devices. Please see our website at
www.onsemi.com for specific Pb−free orderable part numbers, or
contact your local ON Semiconductor sales office or representative.
1
TSSOP−16
DT SUFFIX
CASE 948F
16
V
CC
O
0
O
1
O
2
O
3
O
4
O
5
O
6
1
16
15
14
13
12
11
10
9
EIAJ−16
M SUFFIX
CASE 966
16
1
ORDERING INFORMATION
1
2
3
4
5
6
7
8
Device
Package
Shipping
A
0
A
1
A
2
E
1
E
2
E
3
O
7
GND
MC74AC138N
MC74ACT138N
MC74AC138D
MC74ACT138D
MC74AC138DR2
25 Units/Rail
25 Units/Rail
48 Units/Rail
48 Units/Rail
PDIP−16
PDIP−16
SOIC−16
SOIC−16
Figure 1. Pinout: 16−Lead Packages Conductors
(Top View)
A
0
A
1
A
2
E
1
E
2
E
3
SOIC−16 2500 Tape & Reel
MC74ACT138DR2
MC74AC138DT
2500 Tape & Reel
96 Units/Rail
SOIC−16
O
0
O O O O O O O
1 2 3 4 5 6 7
TSSOP−16
MC74ACT138DT
MC74AC138DTR2
MC74ACT138DTR2
MC74AC138M
96 Units/Rail
2500 Tape & Reel
2500 Tape & Reel
50 Units/Rail
TSSOP−16
TSSOP−16
TSSOP−16
EIAJ−16
Figure 2. Logic Symbol
PIN ASSIGNMENT
50 Units/Rail
MC74ACT138M
MC74AC138MEL
MC74ACT138MEL
EIAJ−16
PIN
A −A
FUNCTION
Address Inputs
Enable Inputs
Enable Input
Outputs
2000 Tape & Reel
2000 Tape & Reel
EIAJ−16
0
2
EIAJ−16
E −E
1
3
2
DEVICE MARKING INFORMATION
E
See general marking information in the device marking
section on page 6 of this data sheet.
O −O
0
7
© Semiconductor Components Industries, LLC, 2006
1
Publication Order Number:
March, 2006 − Rev. 6
MC74AC138/D