集成电路 MM74C923N 热卖

General DescriptionThe MM74C922 and MM74C923 CMOS key encoders pro-vide all the necessary logic to fully encode an array ofSPST switches. The keyboard scan can be implementedby either an external clock or external capacitor. Theseencoders also have on-chip pull-up devices which permitswitches with up to 50 k? on resistance to be used. Nodiodes in the switch array are needed to eliminate ghostswitches. The internal debounce circuit needs only a singleexternal capacitor and can be defeated by omitting thecapacitor. A Data Available output goes to a high levelwhen a valid keyboard entry has been made. The DataAvailable output returns to a low level when the enteredkey is released, even if another key is depressed. The DataAvailable will return high to indicate acceptance of the newkey after a normal debounce period; this two-key roll-overis provided between any two switches.

An internal register remembers the last key pressed evenafter the key is released. The 3-STATE outputs provide foreasy expansion and bus operation and are LPTTL compat-ible.Featuress 50 k? maximum switch on resistances On or off chip clocks On-chip row pull-up devicess 2 key roll-overs Keybounce elimination with single capacitors Last key register at outputss 3-STATE output LPTTL compatibles Wide supply range:3V to 15Vs Low power consumption

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