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Details, datasheet, quote on part number:SN74LS139
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Datasheet text preview:
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.
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LOW POWER SCHOTTKY
· · · · · ·
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
16 1
PLASTIC N SUFFIX CASE 648
GUARANTEED OPERATING RANGES
Symbol VCC TA IOH IOL Parameter Supply Voltage Operating Ambient Temperature Range Output Current High Output Current Low Min 4.75 0 Typ 5.0 25 Max 5.25 70 0.4 8.0 Unit V °C mA mA
16 1
SOIC D SUFFIX CASE 751B
16 1
SOEIAJ M SUFFIX CASE 966
ORDERING INFORMATION
Device SN74LS139N SN74LS139D SN74LS139DR2 SN74LS139M SN74LS139MEL Package 16 Pin DIP SOIC16 SOIC16 SOEIAJ16 SOEIAJ16 Shipping 2000 Units/Box 38 Units/Rail 2500/Tape & Reel See Note 1 See Note 1
1. For ordering information on the EIAJ version of the SOIC package, please contact your local ON Semiconductor representative.
© Semiconductor Components Industries, LLC, 2001
1
October, 2001 Rev. 7
Publication Order Number: SN74LS139/D
SN74LS139
CONNECTION DIAGRAM DIP (TOP VIEW)
VCC 16 Eb 15 A0b 14 A1b 13 O0b 12 O1b 11 O2b 10 O3b 9 NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In Line Package. 1 Ea 2 A0a 3 A1a 4 O0a 5 O1a 6 O2a 7 8
O3a GND LOADING (Note a)
PIN NAMES A0, A1 E O0 - O3 Address Inputs Enable (Active LOW) Input Active LOW Outputs
HIGH 0.5 U.L. 0.5 U.L. 10 U.L.
LOW 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
E
A0 A1
DECODER a O0 O1 O2 O3
DECODER b O0 O1 O2 O3
4567
12 11 10 9
VCC = PIN 16 GND = PIN 8
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SN74LS139
LOGIC DIAGRAM
Ea
1
A0a A1a
2 3 15
Eb
A0b A1b
14 13
VCC = PIN 16 GND = PIN 8 = PIN NUMBERS
4 5 6 7 12 11 10 9
O0a
O1a
O2a
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 (O0O3). 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 E H L L L L A0 X L H L H A1 X L L H H O0 H L H H H OUTPUTS O1 H H L H H O2 H H H L H O3 H H H H L E A0 A1 E A0 A1 E A0 A1 E A0 A1 O0 E A0 A1 E A0 A1 E A0 A1 E A0 A1 O0
O1
O1
O2
O2
H = HIGH Voltage Level L = LOW Voltage Level X = Don't Care
O3
O3
Figure a
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