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The keyboard scan can be implemented by either an external clock or external capacitor. No diodes in the switch array are needed to eliminate datsheet 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.

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An internal register remembers the last key pressed even after the key is released. The keyboard scan can be implemented.

vatasheet The internal debounce circuit needs only a single. A Data Available output goes to a high level. Available output returns to a low level when the entered. Available will return high to indicate acceptance of the new.

74C923 – 74C923 20-Key Encoder Datasheet

An internal register remembers the last key pressed even. Order Number Package Number. Device also available in Tape and Reel.

Pin Assignment for DIP. Pins 0 through Pins 12 through U E Note 1.

(PDF) 74C923 Datasheet download

X1 X2 X3 X4. Fairchild Semiconductor Electronic Components Datasheet. View PDF for Mobile.