74C922

IC 74C922 16-Key Keyboard Encoder — DIP-18 Replacement IC

The 74C922 is a CMOS 16-key keyboard encoder IC in a DIP-18 package, manufactured by Major Brands and based on the classic MM74C922 design. This chip is an essential component for arcade game boards, pinball machine control panels, and other coin-op equipment that relies on keypad or switch matrix input. It provides all the necessary logic to fully encode an array of SPST switches, making it a go-to solution for restoring or repairing keyboard encoder circuits in vintage and modern game room machines alike.

Designed for reliability and flexibility, the 74C922 features built-in keybounce elimination, a last-key register, and two-key rollover support — all critical for responsive and accurate input detection in high-use game room environments. Its wide supply voltage range of 3V to 15V makes it compatible with a broad variety of arcade and pinball hardware platforms.

• Manufacturer: Major Brands | Part Number: 74C922
• Encodes up to 16 keys in a standard DIP-18 package
• On-chip keybounce elimination using a single external capacitor
• Two-key rollover between any two switches
• On-chip row pull-up devices — no diodes needed to prevent ghost switches
• Last key register retains output after key release
• 3-STATE outputs for easy bus expansion and LPTTL compatibility
• Wide supply voltage range: 3V to 15V
• Supports up to 50 kΩ maximum switch on resistance
• On-chip or off-chip clock options