MM74C923N

Product Overview

• Category: Integrated Circuit (IC)
• Use: Encoder/Decoder
• Characteristics:
  • 20-key encoder/decoder with serial output
  • Low power consumption
  • Wide operating voltage range
  • DIP package
• Package: DIP-18
• Essence: The MM74C923N is a versatile encoder/decoder IC that can be used in various applications requiring key encoding and decoding functionality.
• Packaging/Quantity: Available in tubes of 25 units.

Specifications

• Supply Voltage: 3V to 15V
• Input Voltage: 0V to Vcc
• Output Voltage: 0V to Vcc
• Operating Temperature Range: -40°C to +85°C
• Maximum Clock Frequency: 2MHz

Detailed Pin Configuration

The MM74C923N has a total of 18 pins, numbered as follows:

1. GND (Ground)
2. A0 (Address Bit 0)
3. A1 (Address Bit 1)
4. A2 (Address Bit 2)
5. A3 (Address Bit 3)
6. A4 (Address Bit 4)
7. A5 (Address Bit 5)
8. A6 (Address Bit 6)
9. A7 (Address Bit 7)
10. CLK (Clock Input)
11. STB (Strobe Input)
12. OE (Output Enable Input)
13. Q0 (Output Bit 0)
14. Q1 (Output Bit 1)
15. Q2 (Output Bit 2)
16. Q3 (Output Bit 3)
17. Q4 (Output Bit 4)
18. Vcc (Supply Voltage)

Functional Features

• Key Encoding: The MM74C923N can encode up to 20 keys using its address inputs (A0-A7) and the strobe input (STB).
• Key Decoding: It can also decode the encoded key information and provide corresponding output signals on the Q0-Q4 pins.
• Serial Output: The encoder/decoder has a serial output, allowing for easy interfacing with other devices.
• Low Power Consumption: The IC is designed to operate with low power consumption, making it suitable for battery-powered applications.

Advantages and Disadvantages

Advantages: - Versatile functionality for both encoding and decoding - Wide operating voltage range allows for flexibility in different applications - Low power consumption extends battery life - Serial output simplifies interfacing with other devices

Disadvantages: - Limited number of keys that can be encoded (up to 20) - DIP package may not be suitable for space-constrained designs

Working Principles

The MM74C923N works based on a combination of address inputs and control signals. When a key is pressed, the corresponding address is encoded and stored internally. The encoded information can then be decoded and provided as output signals. The clock input (CLK) controls the timing of the encoding and decoding operations, while the strobe input (STB) triggers the encoding process. The output enable input (OE) enables or disables the output signals.

Detailed Application Field Plans

The MM74C923N can be used in various applications that require key encoding and decoding functionality. Some potential application fields include:

1. Keypad Systems: The IC can be used in keypad systems for inputting data or controlling devices.
2. Remote Controls: It can be utilized in remote control units to encode and decode key presses.
3. Security Systems: The MM74C923N can be integrated into security systems for user authentication or access control.
4. Industrial Control: It can be employed in industrial control systems for inputting commands or controlling machinery.

Detailed and Complete Alternative Models

1. HT12E/HT12D: These encoder/decoder ICs offer similar functionality and are available in different package options.
2. CD4028: This BCD-to-Decimal decoder IC can be used as an alternative for specific applications requiring BCD decoding.

Note: The above list is not exhaustive, and there may be other alternative models available in the market.

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