NTE74C923 encoders equivalent, cmos key encoders.
D 50kΩ Maximum Switch On Resistance D On or Off Chip Clock D On−Chip Row Pull−Up Devices D 2 Key Roll−Over D Keybounce Elimination with Single Capacitor D Last Key Regis.
The NTE74C922 (16−Key, 18−Lead DIP) and NTE74C923 (20−Key, 20−Lead DIP) 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 capacit.
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