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MM74C922N

MM74C922N

Product Overview

  • Category: Integrated Circuit (IC)
  • Use: Keyboard Encoder
  • Characteristics: High-performance, 16-key encoder with key rollover, low power consumption
  • Package: DIP (Dual In-line Package)
  • Essence: Converts key presses into binary codes for microprocessor interfacing
  • Packaging/Quantity: Available in tubes of 25 units

Specifications

  • Supply Voltage: 4.75V to 5.25V
  • Input Voltage: 0V to VCC
  • Operating Temperature Range: -40°C to +85°C
  • Maximum Clock Frequency: 10MHz
  • Maximum Key Bounce Time: 10ms
  • Maximum Key Rollover Time: 30ms

Detailed Pin Configuration

The MM74C922N has a total of 18 pins, which are assigned as follows:

  1. VCC: Positive supply voltage
  2. GND: Ground reference
  3. NC: No connection
  4. NC: No connection
  5. NC: No connection
  6. NC: No connection
  7. NC: No connection
  8. NC: No connection
  9. NC: No connection
  10. NC: No connection
  11. NC: No connection
  12. NC: No connection
  13. NC: No connection
  14. NC: No connection
  15. NC: No connection
  16. NC: No connection
  17. CLK: Clock input
  18. DATA: Binary output representing the key pressed

Functional Features

  • Supports up to 16 keys with key rollover capability
  • Debounces and encodes key presses into binary codes
  • Provides a clock input for synchronization
  • Low power consumption for energy-efficient operation
  • Easy integration with microprocessors through the binary output

Advantages and Disadvantages

Advantages

  • High-performance keyboard encoder
  • Key rollover feature ensures accurate key detection
  • Low power consumption extends battery life in portable devices
  • Simple integration with microprocessors

Disadvantages

  • Limited to 16 keys, may not be suitable for applications requiring more inputs
  • No built-in key debounce circuitry, external debouncing may be required

Working Principles

The MM74C922N is a keyboard encoder IC that converts key presses into binary codes. It operates by scanning the state of each key and encoding the pressed key into a binary output. The clock input synchronizes the scanning process, ensuring accurate detection of key presses. The encoded binary output can then be easily interfaced with a microprocessor for further processing.

Detailed Application Field Plans

The MM74C922N is commonly used in various applications that require keyboard input, such as:

  1. Computer keyboards
  2. Numeric keypads
  3. Industrial control panels
  4. Gaming consoles
  5. Remote controls

Detailed and Complete Alternative Models

  1. MM74C923: Similar to MM74C922N but supports up to 20 keys
  2. MM74C924: Enhanced version with built-in key debounce circuitry
  3. MM74C925: Higher-performance variant with faster clock frequency support

These alternative models provide additional features and capabilities, catering to specific application requirements.

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רשום 10 שאלות ותשובות נפוצות הקשורות ליישום של MM74C922N בפתרונות טכניים

Sure! Here are 10 common questions and answers related to the application of MM74C922N in technical solutions:

  1. Question: What is MM74C922N?
    - Answer: MM74C922N is a 16-key encoder IC (Integrated Circuit) that converts key presses into a binary code.

  2. Question: What is the purpose of using MM74C922N in technical solutions?
    - Answer: MM74C922N is commonly used in applications where keypad input needs to be converted into digital signals for further processing.

  3. Question: How many keys can MM74C922N handle?
    - Answer: MM74C922N can handle up to 16 keys, making it suitable for applications with a moderate number of inputs.

  4. Question: Can MM74C922N be used with both mechanical and membrane keypads?
    - Answer: Yes, MM74C922N can be used with both mechanical and membrane keypads as long as they have a compatible interface.

  5. Question: Does MM74C922N require external components for operation?
    - Answer: Yes, MM74C922N requires external pull-up resistors and capacitors for proper functioning.

  6. Question: What is the output format of MM74C922N?
    - Answer: MM74C922N provides a 4-bit binary output, representing the key pressed on the keypad.

  7. Question: Can MM74C922N handle multiple key presses simultaneously?
    - Answer: No, MM74C922N can only detect one key press at a time. Simultaneous key presses may result in incorrect outputs.

  8. Question: What is the power supply voltage range for MM74C922N?
    - Answer: The recommended power supply voltage range for MM74C922N is typically between 4.5V and 5.5V.

  9. Question: Can MM74C922N be used in battery-powered applications?
    - Answer: Yes, MM74C922N can be used in battery-powered applications as long as the power supply voltage requirements are met.

  10. Question: Are there any alternative ICs to MM74C922N for keypad interfacing?
    - Answer: Yes, there are other keypad encoder ICs available in the market, such as HT16K33, CD4021B, or AT42QT1010, which may have different features and specifications.

Please note that these answers are general and may vary depending on specific application requirements and datasheet information.