1-OF-4 DECODER/DEMULTIPLEXER. MC74AC139 Datasheet

MC74AC139 DECODER/DEMULTIPLEXER. Datasheet pdf. Equivalent

Part MC74AC139
Description DUAL 1-OF-4 DECODER/DEMULTIPLEXER
Feature MC74AC139 MC74ACT139 Dual 1ĆofĆ4 Decoder/Demultiplexer The MC74AC139/74ACT139 is a high-speed, dual.
Manufacture Motorola
Datasheet
Download MC74AC139 Datasheet



MC74AC139
MC74AC139
MC74ACT139
Dual 1ĆofĆ4 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.
Multifunction Capability
Two Completely Independent 1-of-4 Decoders
Active LOW Mutually Exclusive Outputs
Outputs Source/Sink 24 mA
• ′ACT139 Has TTL Compatible Inputs
VCC Eb A0b A1b O0b O1b O2b O3b
16 15 14 13 12 11 10 9
DUAL 1-OF-4
DECODER/DEMULTIPLEXER
N SUFFIX
CASE 648-08
PLASTIC
12345678
Ea A0a A1a O0a O1a O2a O3a GND
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
PIN NAMES
A0, A1
E
O0–O3
Address Inputs
Enable Inputs
Outputs
D SUFFIX
CASE 751B-05
PLASTIC
LOGIC SYMBOL
E A0 A1
DECODER a
O0 O1 O2 O3
E A0 A1
DECODER b
O0 O1 O2 O3
FACT DATA
5-1



MC74AC139
MC74AC139 MC74ACT139
LOGIC DIAGRAM
Ea
A0a A1a
Eb
A0b A1b
00a 01a 02a 03a 00b
01b 02b
03b
Please note that this diagram is provided only for the understanding of logic
operations and should not be used to estimate propagation delays.
FUNCTIONAL DESCRIPTION
The MC74AC139/74ACT139 is a high-speed dual 1-of-4
decoder/demultiplexer. The device has two independent
decoders, each of which accepts two binary weighted inputs
(A0–A1) and provides four mutually exclusive active-LOW
outputs (O0–O3). Each decoder has an active-LOW enable
(E). When E is HIGH all outputs are forced HIGH. The enable
can be used as the data input for a 4-output demultiplexer
application. Each half of the MC74AC139/74ACT139
generates all four minterms of two variables. These four
minterms are useful in some applications, replacing multiple
gate functions as shown in Figure a, and thereby reducing the
number of packages required in a logic network.
EE
A0 O0 A0 O0
A1 A1
EE
A0 O1 A0 O1
A1 A1
EE
A0 O2 A0 O2
A1 A1
EE
A0 O3 A0 O3
A1 A1
Figure a: Gate Functions (each half)
MAXIMUM RATINGS*
Symbol
Parameter
Value
Unit
VCC
Vin
Vout
Iin
Iout
ICC
Tstg
DC Supply Voltage (Referenced to GND)
DC Input Voltage (Referenced to GND)
DC Output Voltage (Referenced to GND)
DC Input Current, per Pin
DC Output Sink/Source Current, per Pin
DC VCC or GND Current per Output Pin
Storage Temperature
–0.5 to +7.0
–0.5 to VCC +0.5
–0.5 to VCC +0.5
±20
±50
±50
–65 to +150
V
V
V
mA
mA
mA
°C
* Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended
Operating Conditions.
FACT DATA
5-2





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