In: Business and Management

Submitted By vincentdvampire
Words 2325
Pages 10
Revised April 2001

MM74C922 • MM74C923
16-Key Encoder • 20-Key Encoder
General Description


The MM74C922 and MM74C923 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 50 kΩ 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 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.

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

An internal register remembers the last key pressed even after the key is released. The 3-STATE outputs provide for easy expansion and bus operation and are LPTTL compatible.

Ordering Code:
Order Number

Package Number

Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide



18-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide



20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide



20-Lead Plastic Dual-In-Line Package…...

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