Dual 1-of-4 Decoder/Demultiplexer
MC74AC139, MC74ACT139
Dual 1-of-4 Decoder/Demultiplexer
The MC74AC139/74ACT139 is a high−speed, dual 1−of−4 decoder/dem...
Description
MC74AC139, MC74ACT139
Dual 1-of-4 Decoder/Demultiplexer
The MC74AC139/74ACT139 is a high−speed, dual 1−of−4 decoder/demultiplexer. The device has two independent decoders, each accepting two inputs and providing four mutually−exclusive active−LOW outputs. Each decoder has an active−LOW Enable input which can be used as a data input for a 4−output demultiplexer. Each half of the MC74AC139/74ACT139 can be used as a function generator providing four minterms of two variables.
Features
Multifunctional Capability Two Completely Independent 1−of−4 Decoders Active LOW Mutually Exclusive Outputs Outputs Source/Sink 24 mA ′ACT139 Has TTL Compatible Inputs These are Pb−Free Devices
VCC Eb A0b A1b O0b O1b O2b O3b 16 15 14 13 12 11 10 9
12345678 Ea A0a A1a O0a O1a O2a O3a GND
Figure 1. Pinout: 16−Lead Packages Conductors (Top View)
PIN ASSIGNMENT
PIN FUNCTION
A0, A1 E
Address Inputs Enable Inputs
O0−O3
Outputs
TRUTH TABLE
Inputs
E A0 A1 O0
HXX
LLL LHL LLH LHH
H
L H H H
H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial
Outputs
O1 O2
HH HH LH HL HH
O3
H H H H L
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16 1
16 1
MARKING DIAGRAMS
16 SOIC−16 D SUFFIX CASE 751B
1
xxx139G AWLYWW
TSSOP−16 DT SUFFIX CASE 948F
16
xxx 139 ALYWG
G
1
xxx = AC or ACT A = Assembly Location WL or L = Wafer Lot Y = Year WW or W = Work Week G or G = Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information in the package dimensions s...
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