16-key encoder 20-key encoder.
s 50 kΩ maximum switch on resistance s On or off chip clock s On-chip row pull-up devices s 2 key roll-over s Keybounce elimination with single capacitor s Last key regis.
Synchronous Handshake (MM74C922) Synchronous Data Entry Onto Bus (MM74C922)
The keyboard may be synchronously scanned b.
The MM74C922 and MM74C923 CMOS key encoders provide all the necessary logic to fully encode an array of SPST switches. The keyboard scan can be implemented by either an external clock or external capacitor. These encoders also have on-chip pull-up de.
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