Encyclopedia Entry: 74HC373

Product Overview

Category

The 74HC373 is a type of integrated circuit (IC) belonging to the category of latch and flip-flop devices.

Use

This IC is commonly used in digital electronics for storing and transferring data in various applications.

Characteristics

• The 74HC373 is a high-speed octal transparent latch with three-state outputs.
• It operates on a wide voltage range, typically between 2V and 6V.
• This IC offers low power consumption and high noise immunity.
• It is compatible with both TTL and CMOS logic levels.

Package and Quantity

The 74HC373 is available in different package options, such as DIP (Dual In-line Package) and SOIC (Small Outline Integrated Circuit). The quantity per package varies depending on the manufacturer.

Specifications

• Number of Latches: 8
• Input Voltage Range: 0V to Vcc
• Output Voltage Range: 0V to Vcc
• Maximum Clock Frequency: 25 MHz
• Propagation Delay: 13 ns (typical)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The 74HC373 has a total of 20 pins, each serving a specific function. The pin configuration 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 (Power Supply)

Functional Features

• The 74HC373 operates as a latch, allowing data to be stored and retained.
• It has a transparent mode where the input data is directly transferred to the outputs when the latch enable (LE) signal is high.
• The output enable (OE) signal controls the three-state outputs, enabling or disabling their functionality.

Advantages and Disadvantages

Advantages

• High-speed operation allows for efficient data transfer.
• Compatibility with both TTL and CMOS logic levels makes it versatile.
• Low power consumption helps conserve energy in electronic systems.
• High noise immunity ensures reliable performance even in noisy environments.

Disadvantages

• Limited number of latches (8) may not suffice for certain applications requiring more storage capacity.
• The IC's sensitivity to electrostatic discharge (ESD) requires proper handling during installation and usage.

Working Principles

The 74HC373 functions by using flip-flops to store and control the flow of data. When the latch enable (LE) signal is high, the input data is transferred to the outputs. The output enable (OE) signal determines whether the outputs are active or in a high-impedance state.

Application Field Plans

The 74HC373 finds extensive use in various digital systems, including: - Microprocessor-based systems - Data storage devices - Address decoding circuits - Bus drivers

Alternative Models

Several alternative models similar to the 74HC373 include: - 74HCT373: A variant compatible with TTL logic levels. - 74LS373: A low-power Schottky variant with similar functionality. - CD74HC373: A similar IC manufactured by a different company.

In conclusion, the 74HC373 is a versatile latch IC widely used in digital electronics. Its high-speed operation, compatibility with multiple logic levels, and low power consumption make it suitable for various applications. However, its limited number of latches and sensitivity to ESD should be considered when selecting this IC for specific projects.