MM74C925N

Product Overview

Category

The MM74C925N belongs to the category of integrated circuits (ICs) and specifically falls under the family of digital ICs.

Use

This product is commonly used for digital counter applications, particularly in electronic devices and systems where counting and display functions are required.

Characteristics

• The MM74C925N is known for its high-speed operation and low power consumption, making it suitable for various battery-powered or energy-efficient electronic devices.
• It features a compact design and compatibility with a wide range of digital systems, making it versatile for different applications.

Package

The MM74C925N is typically available in a dual in-line package (DIP), which facilitates easy installation on printed circuit boards (PCBs).

Essence

The essence of this product lies in its ability to accurately count and display digital signals, providing a fundamental function in electronic systems.

Packaging/Quantity

It is commonly packaged in tubes or trays, with quantities varying based on the supplier and customer requirements.

Specifications

• Supply Voltage: 5V
• Maximum Clock Frequency: 30MHz
• Number of Counting Stages: 4
• Operating Temperature Range: -40°C to 85°C
• Output Drive Capability: 10 TTL Loads

Detailed Pin Configuration

The MM74C925N has 16 pins, with each pin serving specific input/output and control functions. The detailed pin configuration is as follows: 1. VCC 2. GND 3. Clock Input (CLK) 4. Reset Input (RST) 5. Carry Output (CY) 6. BCD Output A (QA) 7. BCD Output B (QB) 8. BCD Output C (QC) 9. BCD Output D (QD) 10. BCD Input A (A) 11. BCD Input B (B) 12. BCD Input C (C) 13. BCD Input D (D) 14. Lamp Test Input (LT) 15. Blanking Input (BL) 16. Display Enable (DE)

Functional Features

• BCD Decade Counter: The MM74C925N operates as a binary-coded decimal (BCD) decade counter, allowing it to count from 0 to 9 and reset back to 0.
• Display Driver: It includes built-in display driver capabilities, enabling direct interfacing with common cathode or common anode displays.
• Cascadable Design: Multiple MM74C925N units can be cascaded to create larger counting ranges, expanding its application flexibility.

Advantages and Disadvantages

Advantages

• Low Power Consumption: The IC's efficient power usage makes it suitable for battery-operated devices.
• High-Speed Operation: Its capability to handle high clock frequencies enhances its performance in time-critical applications.
• Versatile Interface: The built-in display driver simplifies the connection to various types of displays.

Disadvantages

• Limited Counting Range: The 4-stage counter may not be sufficient for applications requiring extensive counting capabilities.
• External Components Required: Additional components may be needed for certain display configurations, increasing system complexity.

Working Principles

The MM74C925N operates by receiving clock pulses at the CLK input, incrementing the count based on the input signal. When the count reaches 9, the next clock pulse resets the count to 0 and activates the carry output (CY). The BCD outputs provide the corresponding binary-coded decimal representation of the count, facilitating direct display connections.

Detailed Application Field Plans

The MM74C925N finds applications in various electronic systems, including: - Digital Timers: Utilized for timekeeping and countdown functions in appliances and industrial equipment. - Frequency Dividers: Employed in signal processing circuits to divide input frequencies for specific operations. - Industrial Counters: Integrated into production line machinery for tracking and displaying production counts.

Detailed and Complete Alternative Models

• CD4017: A popular CMOS decade counter with 10 output stages, offering a wider counting range.
• SN74LS192: A synchronous 4-bit up/down decade counter with parallel load capability, suitable for bidirectional counting applications.

In conclusion, the MM74C925N serves as a reliable and efficient digital counter IC, catering to diverse applications that require accurate counting and display functionalities within electronic systems.

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