SN74LS139AD

Product Overview

• Category: Integrated Circuit (IC)
• Use: Decoder/Demultiplexer
• Characteristics:
  • Low-power Schottky TTL technology
  • Dual 2-line to 4-line decoder/demultiplexer
  • Active-low outputs
• Package: DIP (Dual In-line Package)
• Essence: SN74LS139AD is a decoder/demultiplexer IC that converts two input lines into four output lines based on the selected combination of inputs.
• Packaging/Quantity: Available in tubes or reels, with quantities varying depending on the supplier.

Specifications

• Supply Voltage: 4.75V to 5.25V
• High-Level Input Voltage: 2V to 5.25V
• Low-Level Input Voltage: -0.5V to 0.8V
• High-Level Output Voltage: 2.7V (min)
• Low-Level Output Voltage: 0.5V (max)
• Operating Temperature Range: 0°C to 70°C
• Propagation Delay Time: 15ns (typical)

Detailed Pin Configuration

The SN74LS139AD has a total of 16 pins, which are assigned as follows:

1. GND (Ground)
2. A0 (Input A0)
3. A1 (Input A1)
4. E1 (Enable Input 1)
5. Y0 (Output Y0)
6. Y1 (Output Y1)
7. Y2 (Output Y2)
8. Y3 (Output Y3)
9. VCC (Positive Power Supply)
10. E2 (Enable Input 2)
11. B0 (Input B0)
12. B1 (Input B1)
13. Y4 (Output Y4)
14. Y5 (Output Y5)
15. Y6 (Output Y6)
16. Y7 (Output Y7)

Functional Features

• Dual 2-line to 4-line decoder/demultiplexer functionality.
• Active-low outputs: The output lines are active low, meaning they are inverted versions of the selected input combination.
• Enable Inputs: E1 and E2 are used to enable or disable the decoder/demultiplexer operation.

Advantages and Disadvantages

Advantages: - Low-power consumption due to Schottky TTL technology. - Compact size and easy integration into electronic circuits. - Versatile functionality for decoding and demultiplexing applications.

Disadvantages: - Limited number of output lines (4) compared to more advanced decoder ICs. - Not suitable for high-speed applications due to relatively slower propagation delay.

Working Principles

The SN74LS139AD operates based on the principles of combinational logic. It takes two input lines (A0 and A1) and two enable inputs (E1 and E2) to generate four output lines (Y0 to Y3). The selected combination of inputs determines which output line(s) will be active low.

Detailed Application Field Plans

The SN74LS139AD can be used in various applications, including but not limited to: - Address decoding in microprocessors and memory systems. - Data routing and selection in digital multiplexing systems. - Signal demultiplexing in communication systems. - Control signal generation in industrial automation.

Detailed and Complete Alternative Models

Some alternative models that provide similar functionality to SN74LS139AD include: - 74HC139: High-speed CMOS version with similar pin configuration. - CD74HCT139: High-speed CMOS version with increased operating temperature range. - DM74LS139: Standard LS TTL version with identical pin configuration.

These alternative models offer different characteristics and specifications, allowing users to choose the most suitable option for their specific requirements.

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