The 74CSO is designed as a replacement chip for the obsolete MM74C surface . For the latest version of this spec sheet, visit 74C Datasheet, 74C Key Encoder Datasheet, buy 74C 74C are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for 74C
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The keyboard scan can be implemented.
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.
An internal register remembers the last key pressed even. Order Number Package Number. Device also available in Tape and Reel.
(PDF) 74C922 Datasheet download
Pin Assignment for DIP. DC Electrical Characteristics Continued. AC Electrical Characteristics Note 3. Propagation Delay Time to.
74C Datasheet(PDF) – National Semiconductor (TI)
Propagation Delay Time from. High Impedance State to a. C IN Input Capacitance. Any Input Note 4. Any Output Note 4. AC Parameters are guaranteed by DC correlated testing.
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 daatsheet 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.