Encyclopedia Entry: 74AC521SC

Product Overview

Category

The 74AC521SC belongs to the category of integrated circuits (ICs), specifically digital logic ICs.

Use

This IC is commonly used in electronic devices for various applications involving data storage and retrieval.

Characteristics

• The 74AC521SC is a high-speed, low-power octal D-type flip-flop with 3-state outputs.
• It operates on a wide voltage range, typically between 2V and 6V.
• This IC offers excellent noise immunity and robust performance.
• It is designed to be compatible with both TTL and CMOS logic families.

Package and Quantity

The 74AC521SC is available in a standard 20-pin small-outline package (SOIC). It is typically sold in reels or tubes containing multiple units.

Specifications

• Supply Voltage Range: 2V to 6V
• High-Level Input Voltage: 2V to VCC
• Low-Level Input Voltage: GND to 0.8V
• Maximum Operating Frequency: 100 MHz
• Output Drive Capability: ±24 mA
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The 74AC521SC has a total of 20 pins, each serving a specific function. Here is the detailed pin configuration:

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

Functional Features

• The 74AC521SC consists of eight D-type flip-flops with 3-state outputs.
• It offers asynchronous clear functionality to reset the flip-flops.
• The output enable pin allows for tri-state operation, enabling multiple devices to share a common bus.

Advantages and Disadvantages

Advantages: - High-speed operation suitable for time-critical applications. - Wide voltage range compatibility enhances versatility. - Noise immunity ensures reliable performance in noisy environments.

Disadvantages: - Limited output drive capability may restrict use in certain high-current applications. - The 3-state output feature may require additional control circuitry in complex designs.

Working Principles

The 74AC521SC operates based on the principles of digital logic. It utilizes flip-flops to store and manipulate binary data. The asynchronous clear input allows for resetting the stored data, while the output enable pin controls the output state. By combining these features, the IC enables efficient data storage and retrieval operations.

Application Field Plans

The 74AC521SC finds application in various fields, including: 1. Data communication systems 2. Memory modules 3. Microcontrollers 4. Industrial automation 5. Automotive electronics

Alternative Models

For similar functionality, alternative models to the 74AC521SC include: - 74HC521: A compatible CMOS version with higher supply voltage tolerance. - 74LS521: A TTL version with lower power consumption but slower speed. - 74F521: A faster version with higher output drive capability.

In conclusion, the 74AC521SC is a versatile integrated circuit widely used for data storage and retrieval applications. Its high-speed operation, wide voltage range compatibility, and noise immunity make it suitable for various electronic devices across different industries.