74LS139 Dual 2 to 4 line Decoder/Demultiplexer IC (74139) DIP 16 Package

74LS139 Dual 2 to 4 line Decoder/Demultiplexer IC (74139) DIP 16 Package

The 74LS139 is a Dual 2-to-4 Line Decoder/Demultiplexer IC from the 74LS TTL logic family.
It contains two independent 2-to-4 decoders, each with active-low outputs and an enable input. When enabled, each decoder takes a 2-bit binary input and decodes it into one of four active-low outputs.

This IC is widely used for address decoding, data routing, and multiplexing/demultiplexing tasks in digital systems.
It operates from a single +5V supply and features low power consumption, high noise immunity, and fast switching speeds.

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Features:-

• • Designed specifically for high speed: Memory decoders Data transmission systems
• • 74LS139 contains two fully independent 2-to-4-line decoders/demultiplexers
• • Schottky clamped for high performance
• • Typical propagation delay (3 levels of logic) is 21 ns
• • Typical power dissipation  is 34 mW

Specifications:-

Functional Description

• Each of the two decoders operates independently.
• When the enable input (G) is HIGH, all outputs remain HIGH (inactive).
• When G is LOW, the decoder uses inputs A and B to activate one of the four LOW outputs (Y0–Y3).
• Because outputs are active LOW, this IC can drive LEDs, chip select lines, or address decoding lines directly.

Applications

• Memory Address Decoding (to select one of several memory chips)
• Demultiplexing Data Lines
• Digital Signal Routing / Line Selection
• Microprocessor Address Line Decoding
• Chip Select Logic in Embedded Systems
• Code Converters and Function Generators
• LED Display Control Circuits

74ls139-ic-datasheet