SN74AS21DR

Product Overview

• Category: Integrated Circuit
• Use: Logic Gate
• Characteristics: Dual 4-input AND gate
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: High-speed CMOS technology
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 4.5V to 5.5V
• Input Voltage Range: 0V to VCC
• Output Voltage Range: 0V to VCC
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay Time: 9ns (typical)
• Power Dissipation: 22mW (typical)

Detailed Pin Configuration

The SN74AS21DR has a total of 14 pins, which are numbered as follows:

1. A1 (Input A1)
2. B1 (Input B1)
3. Y1 (Output Y1)
4. A2 (Input A2)
5. B2 (Input B2)
6. Y2 (Output Y2)
7. GND (Ground)
8. Y3 (Output Y3)
9. B3 (Input B3)
10. A3 (Input A3)
11. Y4 (Output Y4)
12. B4 (Input B4)
13. A4 (Input A4)
14. VCC (Supply Voltage)

Functional Features

• Dual 4-input AND gate with independent inputs and outputs
• High-speed operation due to advanced CMOS technology
• Low power consumption
• Wide operating voltage range
• Compatible with TTL logic levels
• Schmitt-trigger input for noise immunity

Advantages and Disadvantages

Advantages: - High-speed operation allows for efficient processing of logic signals. - Low power consumption results in energy-efficient operation. - Wide operating voltage range provides flexibility in various applications. - Compatibility with TTL logic levels allows for easy integration with existing systems. - Schmitt-trigger input ensures reliable operation even in the presence of noise.

Disadvantages: - Limited to 4-input AND gate functionality, may not be suitable for complex logic operations. - Availability and pricing may vary depending on market demand.

Working Principles

The SN74AS21DR is based on high-speed CMOS technology, which enables fast switching between logic states. It consists of two independent 4-input AND gates, each capable of accepting four binary inputs and producing a single output based on the logical AND operation. The inputs are buffered to ensure signal integrity, and the outputs are capable of driving standard TTL loads.

Detailed Application Field Plans

The SN74AS21DR can be used in various applications that require logical AND operations. Some potential application fields include:

1. Digital circuit design: The IC can be used to implement logical AND functions in digital circuits such as microcontrollers, programmable logic devices, and arithmetic logic units.
2. Data processing: It can be utilized in data processing systems to perform bitwise AND operations on binary data.
3. Communication systems: The IC can be employed in communication systems for signal conditioning, error detection, and protocol implementation.
4. Industrial automation: It can be integrated into industrial control systems for logical decision-making and process control.

Detailed and Complete Alternative Models

1. SN74AS21N: DIP (Dual In-line Package) version of the SN74AS21DR.
2. SN74LS21: Similar 4-input AND gate IC from the LS series.
3. CD4082: CMOS-based dual 4-input AND gate IC from another manufacturer.

These alternative models offer similar functionality and can be considered as replacements for the SN74AS21DR depending on specific requirements and availability.

Word count: 498 words