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.
http://onsemi.com
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Demultiplexing Capability
Multiple Input Enable for Easy Expansion
Active LOW Mutually Exclusive Outputs
Outputs Source/Sink 24 mA
′ACT138
Has TTL Compatible Inputs
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.
V
CC
16
O
0
15
O
1
14
O
2
13
O
3
12
O
4
11
O
5
10
O
6
9
16
1
DIP−16
N SUFFIX
CASE 648
16
1
SO−16
D SUFFIX
CASE 751B
16
1
TSSOP−16
DT SUFFIX
CASE 948F
16
1
EIAJ−16
M SUFFIX
CASE 966
1
A
0
2
A
1
3
A
2
4
E
1
5
E
2
6
E
3
7
O
7
8
GND
ORDERING INFORMATION
Device
MC74AC138N
MC74ACT138N
MC74AC138D
MC74ACT138D
Package
PDIP−16
PDIP−16
SOIC−16
SOIC−16
SOIC−16
SOIC−16
TSSOP−16
TSSOP−16
Shipping
25 Units/Rail
25 Units/Rail
48 Units/Rail
48 Units/Rail
2500 Tape & Reel
2500 Tape & Reel
96 Units/Rail
96 Units/Rail
Figure 1. Pinout: 16−Lead Packages Conductors
(Top View)
A
0
A
1
A
2
E
1
E
2
E
3
MC74AC138DR2
MC74ACT138DR2
O
0
O
1
O
2
O
3
O
4
O
5
O
6
O
7
MC74AC138DT
MC74ACT138DT
MC74AC138DTR2
TSSOP−16 2500 Tape & Reel
Figure 2. Logic Symbol
PIN ASSIGNMENT
PIN
A
0
−A
2
E
1
−E
2
E
3
O
0
−O
7
FUNCTION
Address Inputs
Enable Inputs
Enable Input
Outputs
MC74ACT138DTR2 TSSOP−16 2500 Tape & Reel
MC74AC138M
MC74ACT138M
MC74AC138MEL
MC74ACT138MEL
EIAJ−16
EIAJ−16
EIAJ−16
EIAJ−16
50 Units/Rail
50 Units/Rail
2000 Tape & Reel
2000 Tape & Reel
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 6 of this data sheet.
©
Semiconductor Components Industries, LLC, 2006
March, 2006
−
Rev. 6
1
Publication Order Number:
MC74AC138/D
ONSEMI [ ON SEMICONDUCTOR ]
