74C922 - 16/ 20-Key Encoder

National Semiconductor

74C922 Datasheet Preview — Preview of 74C922 PDF

Datasheet Details

Part number	74C922
Manufacturer	National Semiconductor ↗
File Size	218.37 KB
Description	16/ 20-Key Encoder
Datasheet	74C922_NationalSemiconductor.pdf

74C922 Product details

Description

These CMOS key encoders provide all the necessary logic to fully encode an array of SPST switches The keyboard scan can be implemented by either an external clock or external capacitor These encoders also have on-chip pullup devices which permit switches with up to 50 kX on resistance to be used 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 ou

Features

Y Y Y Y Y Y Y Y Y 50 kX maximum switch on resistance On or off chip clock On-chip row pull-up devices 2 key roll-over Keybounce elimination with single capacitor Last key register at outputs TRI-STATE outpust LPTTL compatible Wide supply range Low power consumption 3V to 15V Connection Diagrams Pin Assignment for Dual-In-Line Package Pin Assignment for SOIC Pin Assignment for DIP and SOIC Package TL F 6037.
14 Top View TL F 6037.
1 Order Number MM74C922 TL F 6037.

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Published: Apr 3, 2005 |