SN74AS138NG4

Product Overview

• Category: Integrated Circuit (IC)
• Use: Decoder/Demultiplexer
• Characteristics: High-speed, TTL compatible, 3-to-8 line decoding
• Package: DIP (Dual In-line Package)
• Essence: The SN74AS138NG4 is a decoder/demultiplexer IC that converts binary information from a select input into one of eight outputs.
• Packaging/Quantity: Available in tubes or reels, with varying quantities depending on the supplier.

Specifications

• Logic Family: AS (Advanced Schottky)
• Supply Voltage: 4.5V to 5.5V
• Input Voltage: 0V to VCC
• Output Voltage: 0V to VCC
• Operating Temperature: -40°C to +85°C
• Propagation Delay: 9ns (typical)
• Output Current: ±8mA
• Power Dissipation: 500mW

Detailed Pin Configuration

The SN74AS138NG4 has a total of 16 pins, each serving a specific purpose:

1. GND: Ground reference voltage
2. A0: Address input bit 0
3. A1: Address input bit 1
4. A2: Address input bit 2
5. E1: Enable input 1
6. E2: Enable input 2
7. E3: Enable input 3
8. Y0: Output 0
9. Y1: Output 1
10. Y2: Output 2
11. Y3: Output 3
12. Y4: Output 4
13. Y5: Output 5
14. Y6: Output 6
15. Y7: Output 7
16. VCC: Positive supply voltage

Functional Features

• Converts a 3-bit binary input into one of eight outputs.
• High-speed operation suitable for time-critical applications.
• TTL compatible inputs allow easy integration with other logic circuits.
• Enable inputs provide flexibility in controlling the decoder/demultiplexer functionality.

Advantages and Disadvantages

Advantages: - High-speed operation enables efficient data processing. - TTL compatibility ensures compatibility with existing logic circuits. - Flexible enable inputs allow for versatile control options.

Disadvantages: - Limited to 3-to-8 line decoding, may not be suitable for more complex applications. - Requires external components for proper functioning.

Working Principles

The SN74AS138NG4 operates based on the principle of binary decoding. The three address inputs (A0, A1, A2) determine which output line is activated. The enable inputs (E1, E2, E3) control the overall functionality of the decoder/demultiplexer. When the appropriate address combination is applied, the corresponding output line is activated, allowing the passage of data or signals.

Detailed Application Field Plans

The SN74AS138NG4 finds applications in various fields, including:

1. Digital electronics: Used in microprocessors, memory systems, and digital communication systems.
2. Data multiplexing: Enables efficient routing of data signals in communication networks.
3. Address decoding: Facilitates memory addressing in computer systems.
4. Control systems: Provides signal routing capabilities in automation and control applications.

Detailed and Complete Alternative Models

1. SN74LS138: Low-power Schottky version of the decoder/demultiplexer.
2. CD74HC138: High-speed CMOS version with similar functionality.
3. 74HCT138: CMOS version with TTL compatibility and improved noise immunity.

These alternative models offer similar decoding functionality with varying characteristics and specifications.

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