74922 DATASHEET PDF

The keyboard scan can be implemented by either an external clock or external capacitor. These encoders also have on-chip pull-up devices which permit switches with up to 50 k 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.

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October Revised January General Description. SPST switches. The keyboard scan can be implemented. The internal debounce circuit needs only a single. A Data Available output goes to a high level. The Data. Available output returns to a low level when the entered.

Available will return high to indicate acceptance of the new. An internal register remembers the last key pressed even. Ordering Code:. Order Number Package Number. Package Description. Device also available in Tape and Reel. Connection Diagrams. Pin Assignment for DIP. Top View. Connection Diagrams Continued. Pin Assignment for. Truth Tables. Pins 0 through Pins 12 through U E Note 1. X1 X2 X3 X4. Note 1: Omit for MM74C Download 74C Datasheet.

The keyboard scan can be implemented by either an external clock or external capacitor. 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 roll-over is provided between any two switches. An internal register remembers the last key pressed even after the key is released.

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