Product Summary

The MM54C923J/883B is a key encoder providing 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. The MM54C923J/883B has on-chip pull-up devices which permits 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 of the MM54C923J/883B needs only a single external capacitor and can be defeated by omitting the capacitor.

Parametrics

MM54C923J/883B absolute maximum ratings: (1)Voltage at Any Pin VCC: -0.3V to VCC + 0.3V; (2)Operating Temperature Range: -40 to +85℃; (3)Storage Temperature Range: -65 to +150℃; (4)Power Dissipation, PD: 700 mW; (5)Operating VCC Range: 3V to 15V; (6)Lead Temperature (Soldering, 10 seconds): 260℃.

Features

MM54C923J/883B features: (1)50 kΩ maximum switch on resistance; (2)On or off chip clock; (3)On-chip row pull-up devices; (4)2 key roll-over; (5)Keybounce elimination with single capacitor; (6)Last key register at outputs; (7)3-STATE output LPTTL compatible; (8)Wide supply range: 3V to 15V; (9)Low power consumption.

Diagrams

MM54C923J/883B block diagram

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