74LS139 PDF даташит
Спецификация 74LS139 изготовлена «ON Semiconductor» и имеет функцию, называемую «LOW POWER SCHOTTKY». |
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Детали детали
Номер произв | 74LS139 |
Описание | LOW POWER SCHOTTKY |
Производители | ON Semiconductor |
логотип |
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SN74LS139
Dual 1-of-4 Decoder/
Demultiplexer
The LSTTL/MSI SN74LS139 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 LS139 can be used as a function generator providing all
four minterms of two variables. The LS139 is fabricated with the
Schottky barrier diode process for high speed and is completely
compatible with all ON Semiconductor TTL families.
• Schottky Process for High Speed
• Multifunction Capability
• Two Completely Independent 1-of-4 Decoders
• Active Low Mutually Exclusive Outputs
• Input Clamp Diodes Limit High Speed Termination Effects
• ESD > 3500 Volts
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min Typ Max Unit
VCC Supply Voltage
TA Operating Ambient
Temperature Range
4.75 5.0 5.25
V
0 25 70 °C
IOH Output Current – High
IOL Output Current – Low
– 0.4
8.0
mA
mA
http://onsemi.com
LOW
POWER
SCHOTTKY
16
1
PLASTIC
N SUFFIX
CASE 648
16
1
SOIC
D SUFFIX
CASE 751B
ORDERING INFORMATION
Device
Package
Shipping
SN74LS139N 16 Pin DIP 2000 Units/Box
SN74LS139D
16 Pin
2500/Tape & Reel
© Semiconductor Components Industries, LLC, 1999
December, 1999 – Rev. 6
1
Publication Order Number:
SN74LS139/D
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SN74LS139
CONNECTION DIAGRAM DIP (TOP VIEW)
VCC Eb A0b A1b O0b O1b O2b O3b
16 15 14 13 12 11 10 9
NOTE:
The Flatpak version has the same
pinouts (Connection Diagram) as
the Dual In-Line Package.
1 2 3 4 56 78
Ea A0a A1a O0a O1a O2a O3a GND
PIN NAMES
A0, A1
E
O0 – O3
Address Inputs
Enable (Active LOW) Input
Active LOW Outputs
LOADING (Note a)
HIGH
LOW
0.5 U.L.
0.5 U.L.
10 U.L.
0.25 U.L.
0.25 U.L.
5 U.L.
NOTES:
a) 1 TTL Unit Load (U.L.) = 40 mA HIGH/1.6 mA LOW.
LOGIC SYMBOL
1 23
15 14 13
E A0 A1
DECODER a
O0 O1 O2 O3
E A0 A1
DECODER b
O0 O1 O2 O3
4567
12 11 10 9
VCC = PIN 16
GND = PIN 8
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2
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SN74LS139
LOGIC DIAGRAM
Ea
1
A0a A1a
23
Eb
15
A0b A1b
14 13
VCC = PIN 16
GND = PIN 8
= PIN NUMBERS
4
O0a
5
O1a
6
O2a
7 12 11 10
9
O3a O0b O1b O2b O3b
FUNCTIONAL DESCRIPTION
The LS139 is a high speed dual 1-of-4 decoder/
demultiplexer fabricated with the Schottky barrier diode
process. The device has two independent decoders, each of
which accept two binary weighted inputs (A0, A1) and
provide 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 LS139 generates all four minterms of two
variables. These four minterms are useful in some
applications, replacing multiple gate functions as shown in
Fig. a, and thereby reducing the number of packages
required in a logic network.
TRUTH TABLE
INPUTS
OUTPUTS
E A0 A1 O0 O1 O2
HXXHHH
L L L LHH
LHLHLH
L LHHHL
L HHHHH
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
O3
H
H
H
H
L
EE
A0 O0 A0
A1 A1
EE
A0 O1 A0
A1 A1
EE
A0 O2 A0
A1 A1
EE
A0 O3 A0
A1 A1
Figure a
O0
O1
O2
O3
http://onsemi.com
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