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74C922

Part Number	74C922
Manufacturer	National Semiconductor
Description	16/ 20-Key Encoder
Published	Apr 3, 2005
Detailed Description	MM54C922 MM74C922 16-Key Encoder MM54C923 MM74C923 20-Key Encoder July 1993 MM54C922 MM74C922 16-Key Encoder MM54C923 ...
Datasheet	74C922 PDF File

Overview

MM54C922 MM74C922 16-Key Encoder MM54C923 MM74C923 20-Key Encoder July 1993 MM54C922 MM74C922 16-Key Encoder MM54C923 MM74C923 20-Key Encoder General Description These 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 pullup devices which permit switches with up to 50 kX on resistance to be used No diodes in the switch array are needed to eliminate ghost switches The internal debounce circuit needs only a single external capacitor and can be defeated by omitting the capacitor A Data Available output goes to a high level when a valid keyboard entry has been made The Data Available output returns to a low level when the entered key is released even if another key is depressed The Data Available will return high to indicate acceptance of the new key after a normal debounce period this two-key rollover is provided between any tw...

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