Encyclopedia Entry: 74AC521SJX

Product Overview

Category

The 74AC521SJX belongs to the category of integrated circuits (ICs).

Use

This IC is commonly used in digital electronics for various applications such as data storage, address decoding, and multiplexing.

Characteristics

• The 74AC521SJX is a high-speed, low-power octal latch with 3-state outputs.
• It operates on a supply voltage range of 2V to 6V, making it suitable for a wide range of electronic devices.
• This IC offers a maximum propagation delay of 7.5 ns, ensuring efficient data transfer.
• It features 8 independent D-type latches with 3-state outputs, providing flexibility in circuit design.

Package and Quantity

The 74AC521SJX is available in a standard 20-pin small outline package (SOP). Each package contains one IC.

Specifications

• Supply Voltage Range: 2V to 6V
• Maximum Propagation Delay: 7.5 ns
• Number of Latches: 8
• Output Type: 3-state
• Package Type: SOP
• Pin Count: 20

Detailed Pin Configuration

The pin configuration of the 74AC521SJX is as follows:

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. LE (Latch Enable)
11. OE (Output Enable)
12. Q0 (Output 0)
13. Q1 (Output 1)
14. Q2 (Output 2)
15. Q3 (Output 3)
16. Q4 (Output 4)
17. Q5 (Output 5)
18. Q6 (Output 6)
19. Q7 (Output 7)
20. VCC (Supply Voltage)

Functional Features

• The latch enable (LE) input controls the data transfer from the inputs to the outputs.
• The output enable (OE) input enables or disables the outputs.
• The 3-state outputs allow multiple devices to share a common bus, reducing the number of required connections.

Advantages and Disadvantages

Advantages: - High-speed operation allows for efficient data processing. - Low power consumption makes it suitable for battery-powered devices. - 3-state outputs provide flexibility in circuit design.

Disadvantages: - Limited number of latches (8) may not be sufficient for complex applications requiring more inputs.

Working Principles

The 74AC521SJX operates based on the principles of digital logic. When the latch enable (LE) input is high, the data from the inputs (D0-D7) is transferred to the outputs (Q0-Q7). The output enable (OE) input controls whether the outputs are active or in a high-impedance state.

Detailed Application Field Plans

The 74AC521SJX can be used in various applications, including: - Address decoding in memory systems - Data storage in microcontrollers - Multiplexing in communication systems

Alternative Models

Other alternative models that can be considered as replacements for the 74AC521SJX include: - 74HC521: Similar functionality but operates at a higher voltage range (2V to 6V). - 74LS521: Lower power consumption but with slower propagation delay.

In conclusion, the 74AC521SJX is a versatile integrated circuit commonly used in digital electronics for data storage, address decoding, and multiplexing applications. Its high-speed operation, low power consumption, and 3-state outputs make it a popular choice among designers. However, its limited number of latches may be a drawback in complex applications.