SN74LS139ADR

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 enable inputs
  • Wide operating voltage range: 2V to 6V
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: SN74LS139ADR is a decoder/demultiplexer IC that converts two input lines into four output lines based on the active LOW enable inputs.
• Packaging/Quantity: Available in reels of 2500 pieces.

Specifications

• Supply Voltage Range: 2V to 6V
• High-Level Input Voltage: 2V (min), VCC (max)
• Low-Level Input Voltage: GND (min), 0.8V (max)
• High-Level Output Voltage: VCC - 0.5V (min), VCC (max)
• Low-Level Output Voltage: 0.25V (min), 0.4V (max)
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

SN74LS139ADR has a total of 16 pins, which are assigned as follows:

1. A0: Input line A0
2. A1: Input line A1
3. E1: Enable input 1 (active LOW)
4. Y0: Output line Y0
5. Y1: Output line Y1
6. GND: Ground
7. Y2: Output line Y2
8. Y3: Output line Y3
9. E2: Enable input 2 (active LOW)
10. VCC: Positive power supply
11. B0: Input line B0
12. B1: Input line B1
13. G1: Output enable input 1 (active LOW)
14. G2: Output enable input 2 (active LOW)
15. Y4: Output line Y4
16. Y5: Output line Y5

Functional Features

• SN74LS139ADR is a dual 2-line to 4-line decoder/demultiplexer.
• It has two enable inputs (E1 and E2) that control the operation of the decoder.
• The active LOW enable inputs allow the outputs to be enabled or disabled based on the input conditions.
• The IC converts the binary input combination into corresponding active LOW outputs.

Advantages and Disadvantages

Advantages: - Low-power consumption due to Schottky TTL technology. - Wide operating voltage range allows compatibility with various systems. - Compact SOIC package enables space-saving integration.

Disadvantages: - Limited number of output lines (4) compared to other decoder/demultiplexer ICs. - Active LOW enable inputs may require additional circuitry for certain applications.

Working Principles

SN74LS139ADR operates by decoding the input lines A0, A1, B0, and B1. The enable inputs (E1 and E2) control the output lines' activation. When the enable inputs are active LOW, the selected output lines (Y0 to Y5) correspond to the binary input combination. The remaining output lines remain inactive.

Detailed Application Field Plans

SN74LS139ADR finds applications in various fields, including: 1. Address decoding in microprocessors and microcontrollers. 2. Data routing and selection in digital systems. 3. Memory expansion control in computer systems. 4. Multiplexing and demultiplexing operations in communication systems. 5. Control logic implementation in industrial automation.

Detailed and Complete Alternative Models

Some alternative models to SN74LS139ADR are: 1. 74HC139: High-speed CMOS version with similar functionality. 2. CD74HC139E: High-speed CMOS decoder/demultiplexer in DIP package. 3. SN54LS139: Low-power Schottky TTL version with identical specifications.

These alternative models provide similar decoding and demultiplexing capabilities, catering to different design requirements.

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