Encyclopedia Entry: 74AC521SJ

Product Overview

Category

The 74AC521SJ belongs to the category of integrated circuits (ICs).

Use

This IC is commonly used in digital electronic systems for data storage and manipulation.

Characteristics

• The 74AC521SJ 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

The 74AC521SJ is available in a standard 20-pin small outline package (SOP).

Essence

The essence of this IC lies in its ability to store and transfer digital information reliably within electronic systems.

Packaging/Quantity

The 74AC521SJ is typically packaged in reels or tubes, containing a quantity of 250 units per package.

Specifications

• Supply Voltage Range: 2V to 6V
• High-Level Input Voltage: 2V to VCC
• Low-Level Input Voltage: GND to 0.8V
• High-Level Output Voltage: VCC - 0.5V
• Low-Level Output Voltage: 0.5V
• Maximum Operating Frequency: 100 MHz
• Propagation Delay Time: 7 ns

Detailed Pin Configuration

The 74AC521SJ has a total of 20 pins, each serving a specific function. Here is the detailed pin configuration:

1. GND (Ground)
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. CLK (Clock Input)
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 74AC521SJ offers the following functional features:

• Octal D-type flip-flop with 3-state outputs.
• Synchronous operation with a common clock input (CLK).
• Individual data inputs (D0-D7) for each flip-flop.
• Output enable (OE) control to enable/disable the outputs.
• High-speed operation with minimal propagation delay.

Advantages and Disadvantages

Advantages

• Wide voltage range compatibility.
• Excellent noise immunity.
• High-speed operation.
• Low power consumption.
• Compact package size.

Disadvantages

• Limited number of flip-flops (8 in total).
• Not suitable for applications requiring a large number of storage elements.

Working Principles

The 74AC521SJ operates based on the principles of digital logic circuits. It utilizes D-type flip-flops to store and transfer data. The synchronous operation ensures that data is transferred at the rising edge of the clock signal. The output enable control allows for enabling or disabling the outputs as needed.

Detailed Application Field Plans

The 74AC521SJ finds applications in various digital electronic systems, including but not limited to:

1. Microprocessors and microcontrollers.
2. Data storage systems.
3. Communication equipment.
4. Industrial control systems.
5. Automotive electronics.
6. Consumer electronics.

Detailed and Complete Alternative Models

Here are some alternative models that offer similar functionality to the 74AC521SJ:

1. 74HC521: High-speed CMOS version with compatible pin configuration.
2. CD74AC521: Another variant from a different manufacturer, offering similar features.
3. SN74AC521: Texas Instruments' version of the octal D-type flip-flop.

These alternative models can be considered based on specific requirements and availability.

In conclusion, the 74AC521SJ is a versatile integrated circuit used for data storage and manipulation in digital electronic systems. Its high-speed operation, wide voltage range compatibility, and compact package make it suitable for various applications. However, its limited number of flip-flops may restrict its use in applications requiring a large number of storage elements.