74LS922 DATASHEET PDF

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It offers a large amount of data sheet, You can free PDF files download. The updated every day, always provide the best quality and speed. 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. DC Electrical Characteristics Continued.

I SINK. Output Source Current. Output Sink Current. AC Electrical Characteristics Note 3. Propagation Delay Time to. Propagation Delay Time from. High Impedance State to a. C IN Input Capacitance. Any Input Note 4. C OUT. Any Output Note 4. Note 4: Capacitance is guaranteed by periodic testing. 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. PDF Datasheet ]. SparkFun Electronics. Allied Electronics DigiKey Electronics. Arrow Electronics Mouser Electronics. Chip One Stop.

Fairchild Semiconductor. National Semiconductor.

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July General Description. These CMOS key encoders provide all the necessary logic. Data Available output returns to a low level when the en-. Data Available will return high to indicate acceptance of the. An internal register remembers the last key pressed even.

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