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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