BUY MM74C922N https://www.utsource.net/itm/p/11221912.html
IC ENCODER 16-KEY 18-DIP
Description: The MM74C922N is a 16-key encoder with a 4-bit output. It is a CMOS device with a DIP-18 package. Features: Low power consumption High noise immunity Low power Schottky TTL compatible Low power Schottky compatible Inputs are TTL compatible Outputs are open drain Applications: Keyboards Remote control Security systems Automotive applications (For reference only)