Encyclopedia Entry: 74AC821SPC

Product Overview

Category

The 74AC821SPC belongs to the category of integrated circuits (ICs).

Use

This IC is commonly used in digital electronic systems for various applications, including data processing, signal transmission, and logic operations.

Characteristics

• High-speed operation: The 74AC821SPC is designed to operate at high speeds, making it suitable for time-critical applications.
• Low power consumption: This IC is energy-efficient, ensuring minimal power consumption during operation.
• Wide voltage range: It can operate within a wide voltage range, providing flexibility in different electronic systems.
• Compact package: The 74AC821SPC is available in a compact package, allowing for easy integration into circuit boards.

Package and Quantity

The 74AC821SPC is typically packaged in a small outline integrated circuit (SOIC) package. Each package contains one unit of the IC.

Specifications

The specifications of the 74AC821SPC are as follows:

• Supply Voltage: 2V to 6V
• Input Voltage: 0V to Vcc
• Output Voltage: 0V to Vcc
• Operating Temperature Range: -40°C to +85°C
• Logic Family: AC
• Number of Pins: 20
• Logic Function: 10-bit D-type flip-flop with 3-state outputs

Detailed Pin Configuration

The pin configuration of the 74AC821SPC is as follows:

1. CLR (Clear)
2. CP (Clock Pulse)
3. D0 (Data Input 0)
4. D1 (Data Input 1)
5. D2 (Data Input 2)
6. D3 (Data Input 3)
7. D4 (Data Input 4)
8. D5 (Data Input 5)
9. D6 (Data Input 6)
10. D7 (Data Input 7)
11. OE (Output Enable)
12. Q0 (Flip-Flop Output 0)
13. Q1 (Flip-Flop Output 1)
14. Q2 (Flip-Flop Output 2)
15. Q3 (Flip-Flop Output 3)
16. Q4 (Flip-Flop Output 4)
17. Q5 (Flip-Flop Output 5)
18. Q6 (Flip-Flop Output 6)
19. Q7 (Flip-Flop Output 7)
20. Vcc (Supply Voltage)

Functional Features

The 74AC821SPC offers the following functional features:

• 10-bit D-type flip-flop: It can store and transfer data in a sequential manner.
• 3-state outputs: The IC provides three-state outputs, allowing multiple devices to share a common bus without interference.
• Clear function: The CLR pin allows for resetting the flip-flop to its initial state.
• Clock pulse input: The CP pin triggers the flip-flop to capture and store the input data.

Advantages and Disadvantages

Advantages

• High-speed operation enables efficient data processing.
• Low power consumption ensures energy efficiency.
• Wide voltage range allows for compatibility with various systems.
• Compact package facilitates easy integration into circuits.

Disadvantages

• Limited number of flip-flop outputs may restrict certain applications requiring more outputs.
• Sensitivity to electrostatic discharge (ESD) requires proper handling during installation and usage.

Working Principles

The 74AC821SPC operates based on the principles of digital logic circuits. When a clock pulse is received at the CP pin, the flip-flop captures and stores the data present at the input pins (D0-D7). The stored data is then available at the corresponding output pins (Q0-Q7). The outputs can be enabled or disabled using the OE pin. The CLR pin resets the flip-flop to its initial state.

Detailed Application Field Plans

The 74AC821SPC finds applications in various fields, including:

1. Data communication systems: It can be used for data storage and transmission in networking equipment.
2. Microprocessor-based systems: The IC can serve as a register for temporary data storage in microprocessor-based systems.
3. Control systems: It is suitable for sequential control applications where data needs to be stored and processed.
4. Digital signal processing: The 74AC821SPC can be utilized in digital signal processing circuits for storing intermediate results.

Alternative Models

Several alternative models with similar functionality to the 74AC821SPC are available in the market. Some notable alternatives include:

• 74HC821
• CD74AC821
• SN74AC821

These models offer comparable features and can be considered as substitutes based on specific requirements.

In conclusion, the 74AC821SPC is a high-speed, low-power integrated circuit commonly used in digital electronic