Product Summary

The 82C79 is a programmable keyboard/display interface. The keyboard portion can provide a scanned interface up to 64-contact key matrix. Also, the keyboard portion of 82C79 can interface to an array of sensors or a strobed interface keyboard. Key depressions can be 2-key lockout or N-key rollover. The display portion of 82C79 has 16 X 8 bits display RAM which can be treated as dual 16 X 4 bits. Both right entry and left entry display formats are possible.

Parametrics

82C79 absolute maximum ratings: (1)Vcc supply voltage: -0.5 to 7.0V; (2)storage temperature range: -65 to 150 ℃; (3)input voltage: -0.5 to Vcc+0.5 V;(4)output voltage: -0.5 to Vcc+0.5 V; (5)soldering temperature: 260 ℃; (6)power dissipation: 250 mW; (7)operating temperature range: -40 to 85 ℃.

Features

82C79 features: (1)simultaneous keyboard display operation; (2)scanned keyboard mode; (3)scanned sensor matrix mode; (4)strobed input entry mode; (5)Built-in 8-Character FIFO or 64 bit sensor RAM; (6)programmable 2-key lockout or N-key rollover with contact debounce; (7)built-in 16 X 8bit display RAM; (8)programmable scan timing; (9)extend operating temperature range -40 to+85 ℃.

Diagrams

82C79 block diagram