74C923 Datasheet - Fairchild Semiconductor

74C923, 16-Key Encoder 20-Key Encoder

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.

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Datasheet Details

Part number:

74C923

Manufacturer:

Fairchild Semiconductor

File Size:

114.68 KB

Description:

16-Key Encoder 20-Key Encoder

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

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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74C923 16-Key Encoder 20-Key Encoder Fairchild Semiconductor

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