SN74AS21N

Product Overview

• Category: Integrated Circuit (IC)
• Use: Logic Gate
• Characteristics: Dual 4-input AND gate
• Package: DIP-14 (Dual In-line Package with 14 pins)
• Essence: Combines four input signals and provides an output signal based on the AND logic operation.
• Packaging/Quantity: Typically sold in reels or tubes containing multiple units.

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: 500mW (max)

Detailed Pin Configuration

The SN74AS21N has a total of 14 pins, which are labeled 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: The SN74AS21N combines four input signals and performs the AND logic operation on them.
• High-speed operation: With a propagation delay time of only 9ns, this IC ensures fast processing of input signals.
• Wide operating voltage range: It can operate within a supply voltage range of 4.5V to 5.5V, making it compatible with various systems.
• TTL compatibility: The SN74AS21N is designed to be compatible with TTL (Transistor-Transistor Logic) levels, allowing easy integration into existing circuits.

Advantages and Disadvantages

Advantages: - High-speed operation enables quick response times. - Wide operating voltage range provides flexibility in different applications. - TTL compatibility allows for seamless integration with existing systems.

Disadvantages: - Limited functionality: The SN74AS21N only performs the AND logic operation and does not offer other logic functions. - DIP package: The Dual In-line Package may require additional space compared to surface-mount packages.

Working Principles

The SN74AS21N operates based on the AND logic gate principle. It takes four input signals (A1, B1, A2, B2, A3, B3, A4, B4) and produces an output signal (Y1, Y2, Y3, Y4) based on the logical AND operation performed on the inputs. If all the inputs are high (logic level 1), the output will be high; otherwise, the output will be low (logic level 0).

Detailed Application Field Plans

The SN74AS21N can be used in various applications that require logical operations, such as:

1. Digital circuit design: It can be utilized in the design of complex digital systems, including microprocessors, memory units, and arithmetic circuits.
2. Data processing: The IC can be employed in data processing systems where logical operations are necessary, such as in data sorting or filtering.
3. Control systems: It can be integrated into control systems to perform logical decision-making tasks based on multiple input conditions.
4. Communication systems: The SN74AS21N can be used in communication systems for signal processing and routing purposes.

Detailed and Complete Alternative Models

1. SN74AS21D: Similar to SN74AS21N, but in SOIC-14 (Small Outline Integrated Circuit) package.
2. CD4082BE: Dual 4-input AND gate IC from Texas Instruments with similar functionality.
3. MC14082B: Dual 4-input AND gate IC from ON Semiconductor, compatible with TTL logic levels.

(Note: This is not an exhaustive list of alternative models; further research is recommended for a comprehensive selection.)

In conclusion, the SN74AS21N is a dual 4-input AND gate IC that combines four input signals using the AND logic operation. With its high-speed operation, wide operating voltage range, and TTL compatibility, it finds applications in digital circuit design, data processing, control systems, and communication systems. Alternative models such as SN74AS21D, CD4082BE, and MC14082B offer similar functionality and can be considered based on specific requirements.