MM74C922N

Part points

• The MM74C922N chip is a keyboard encoder that receives input from a matrix keyboard and converts it into a binary code. It has 16 input lines, allowing it to support up to 16 keys. The chip uses a 4x4 matrix format for key arrangements and generates an 8-bit binary output. It is commonly used in applications requiring keypad interfacing, such as calculators and microcontrollers.

• Equivalent

  Some equivalent products of the MM74C922N chip are the CD74HC238E, CD4543BE, and PCF8576CH.

• Features

  MM74C922N is a 16-key encoder with an internally latched output for decoding keyboard matrix interface. It eliminates the need for external diodes with key-matrix circuits and includes on-chip pull-up resistors. It can handle a debounce two-key roll-over and converges to key press/release in maximum 5ms.

• Pinout

  The MM74C922N is a 16-pin integrated circuit (IC) that functions as a 4 x 4 key matrix (16-key) and keyboard encoder. It provides a debounce feature, scans and encodes key inputs, and has output interfacing capability for microprocessors or display drivers.

• Manufacturer

  The manufacturer of the MM74C922N is Fairchild Semiconductor. It is a global company that specializes in the development and manufacturing of semiconductor devices and integrated circuits. They supply various industries including automotive, consumer electronics, telecommunications, and industrial.

• Application Field

  The MM74C922N is commonly used as a keypad encoder and decoder in various applications such as security systems, industrial control panels, and electronic locks. It can also be used as a key matrix controller, allowing multiple keys to be scanned and encoded in a simple and efficient manner.

• Package

  The MM74C922N chip is available in a DIP (Dual In-Line Package) package type. It has a 18-pin form factor, measuring approximately 9.4mm x 19.7mm in size.