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74C922 16-Key Encoder 20-Key Encoder

74C922 Description

MM74C922 * MM74C923 16-Key Encoder * 20-Key Encoder October 1987 Revised January 1999 MM74C922 * MM74C923 16-Key Encoder The MM74C922 and MM74C923 CMOS key encoders provide all the necessary logic to fully encode an array of SPST switches.

74C922 Features

* s 50 kΩ maximum switch on resistance s On or off chip clock s On-chip row pull-up devices s 2 key roll-over s Keybounce elimination with single capacitor s Last key register at outputs s 3-STATE output LPTTL compatible s Wide supply range: 3V to 15V s Low power consumption Ordering Code: Order Numb

74C922 Applications

* Synchronous Handshake (MM74C922) Synchronous Data Entry Onto Bus (MM74C922) The keyboard may be synchronously scanned by omitting the capacitor at osc. and driving osc. directly if the system clock rate is lower than 10 kHz Outputs are enabled when valid entry is made and go into 3-STATE when key

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Datasheet Details

Part number
74C922
Manufacturer
Fairchild Semiconductor
File Size
114.68 KB
Datasheet
74C922_FairchildSemiconductor.pdf
Description
16-Key Encoder 20-Key Encoder

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Fairchild Semiconductor 74C922-like datasheet