MC74AC138, MC74ACT138
1−of−8
Decoder/Demultiplexer
T h e M C 7 4 A C 1 3 8 / 7 4 A C T 1 3 8 i s a h i g h−s p e e d 1 −o f −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−32 decoder using four MC74AC138/74ACT138 devices and one
inverter.
•
•
•
•
•
w
Demultiplexing Capability
Multiple Input Enable for Easy Expansion
Active LOW Mutually Exclusive Outputs
Outputs Source/Sink 24 mA
′ACT138 Has TTL Compatible Inputs
http://onsemi.com
DIP−16
N SUFFIX
CASE 648
16
1
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.
VCC
O0
O1
O2
O3
O4
O5
15
14
13
12
11
10
1
16
O6
16
16
SO−16
D SUFFIX
CASE 751B
TSSOP−16
DT SUFFIX
CASE 948F
9
16
1
A0
2
A1
3
A2
4
E1
5
E2
6
E3
7
O7
1
1
EIAJ−16
M SUFFIX
CASE 966
ORDERING INFORMATION
8
GND
Device
SOIC−16
2500 Tape & Reel
TSSOP−16
96 Units/Rail
TSSOP−16
96 Units/Rail
TSSOP−16 2500 Tape & Reel
EIAJ−16
50 Units/Rail
EIAJ−16
2000 Tape & Reel
MC74ACT138MEL
Outputs
50 Units/Rail
MC74AC138MEL
Enable Input
EIAJ−16
MC74ACT138M
Enable Inputs
March, 2006 − Rev. 6
2500 Tape & Reel
MC74AC138M
Address Inputs
© Semiconductor Components Industries, LLC, 2006
SOIC−16
MC74ACT138DTR2 TSSOP−16 2500 Tape & Reel
FUNCTION
O0−O7
48 Units/Rail
MC74AC138DT
PIN ASSIGNMENT
E3
SOIC−16
MC74AC138DTR2
E1−E2
48 Units/Rail
MC74ACT138DT
A0−A2
SOIC−16
MC74ACT138DR2
PIN
25 Units/Rail
MC74AC138DR2
Figure 2. Logic Symbol
PDIP−16
MC74ACT138D
O0 O1 O2 O3 O4 O5 O6 O7
25 Units/Rail
MC74ACT138N
E1 E2 E3
PDIP−16
MC74AC138D
A0 A1 A2
Shipping
MC74AC138N
Figure 1. Pinout: 16−Lead Packages Conductors
(Top View)
Package
EIAJ−16
2000 Tape & Reel
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 6 of this data sheet.
1
Publication Order Number:
MC74AC138/D