Encyclopedia Entry: 74AC821SC

Product Overview

Category

The 74AC821SC belongs to the category of integrated circuits (ICs) and specifically falls under the family of digital logic devices.

Use

This IC is primarily used for data processing and manipulation in various electronic systems. It is commonly employed in applications that require high-speed data transmission and efficient data storage.

Characteristics

• High-speed operation: The 74AC821SC is designed to operate at high clock frequencies, making it suitable for time-critical applications.
• Low power consumption: This IC consumes minimal power, ensuring energy efficiency in electronic systems.
• Wide voltage range: It can operate within a wide voltage range, typically between 2V and 6V, providing flexibility in different circuit designs.
• Compact package: The 74AC821SC is available in a small surface-mount package, enabling space-saving integration into electronic devices.

Package and Quantity

The 74AC821SC is packaged in a standard SOIC (Small Outline Integrated Circuit) package. Each package contains one IC.

Specifications

• Logic Family: Advanced CMOS (Complementary Metal-Oxide-Semiconductor)
• Number of Pins: 20
• Supply Voltage Range: 2V to 6V
• Operating Temperature Range: -40°C to +85°C
• Propagation Delay: <10 ns
• Output Current: ±24 mA

Detailed Pin Configuration

The 74AC821SC has a total of 20 pins, each serving a specific function. Here is the detailed pin configuration:

1. A0: Input A0
2. A1: Input A1
3. A2: Input A2
4. A3: Input A3
5. A4: Input A4
6. GND: Ground
7. B4: Input B4
8. B3: Input B3
9. B2: Input B2
10. B1: Input B1
11. B0: Input B0
12. C0: Input C0
13. C1: Input C1
14. C2: Input C2
15. C3: Input C3
16. C4: Input C4
17. GND: Ground
18. OE: Output Enable
19. Y: Output Y
20. VCC: Supply Voltage

Functional Features

The 74AC821SC is a synchronous 10-bit counter with parallel load capability. Its key functional features include:

• Parallel Load: The IC allows loading of data in parallel, enabling quick initialization of the counter.
• Synchronous Operation: The counter operates synchronously with the clock signal, ensuring accurate and reliable counting.
• Output Enable Control: The output enable pin (OE) provides control over the output state, allowing flexibility in system design.

Advantages and Disadvantages

Advantages

• High-speed operation enables efficient data processing.
• Low power consumption contributes to energy efficiency.
• Wide voltage range allows compatibility with various circuit designs.
• Compact package facilitates space-saving integration.

Disadvantages

• Limited bit count: The 74AC821SC is a 10-bit counter, which may not be suitable for applications requiring higher bit counts.
• Lack of built-in error detection or correction mechanisms.

Working Principles

The 74AC821SC operates based on the principles of digital logic circuits. It utilizes flip-flops and combinational logic to perform counting operations. The synchronous nature of the counter ensures that all bits change simultaneously with each clock pulse, maintaining synchronization and accuracy.

Detailed Application Field Plans

The 74AC821SC finds application in various electronic systems, including but not limited to: - Data communication systems - Digital signal processing - Microcontrollers and microprocessors - Industrial automation - Test and measurement equipment

Detailed Alternative Models

For applications requiring different specifications or features, alternative models to consider include: - 74AC821: Similar functionality but operates at a different voltage range (3V to 5.5V). - 74HC821: Compatible with CMOS and TTL logic families, offering versatility in system integration. - 74LS821: Operates at lower clock frequencies but provides compatibility with older TTL-based systems.

In conclusion, the 74AC821SC is a high-speed, low-power 10-bit counter IC that finds application in various electronic systems. Its compact package, wide voltage range, and parallel load capability make it a versatile choice for data processing and manipulation.