NTE74C922 Datasheet CMOS Key Encoders

Manufacturer: NTE Electronics (defunct)

Overview: NTE74C922 & NTE74C923 Integrated Circuit TTL− CMOS Key Encoders.

Datasheet Details

Part number	NTE74C922
Manufacturer	NTE Electronics (defunct)
File Size	82.84 KB
Description	CMOS Key Encoders
Datasheet	NTE74C922_NTEElectronics.pdf

General Description

: The NTE74C922 (16−Key, 18−Lead DIP) and NTE74C923 (20−Key, 20−Lead DIP) 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 pull−up devices which permit switches with up to 50kΩ on resistance to be used.

Key Features

D 50kΩ Maximum Switch On Resistance D On or Off Chip Clock D On.
Chip Row Pull.
Up Devices D 2 Key Roll.
Over D Keybounce Elimination with Single Capacitor D Last Key Register at Outputs D 3.
STATE Output LPTTL Compatible D Wide Supply range: 3V to 15V D Low Power Consumption Absolute Maximum Ratings: (Note 1) Operating VCC Range.
. . . 3V to 15V VCC.

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