KBDP64 Datasheet, PDF (1/7 Pages) ABCircuits – Parallel output keyboard encoder for up to 64 keys

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KBDP64 IC
Parallel output keyboard encoder for up to 64 keys
General Description
The KBDP64 IC is designed to provide a parallel binary output encoder for keyboards up to 64
keys. The KBDP64 IC contains all the logic necessary to encode a SPST keyboard switch array
up to 8 by 8 in size and provide a parallel binary output and a data available strobe. The data
available strobe goes high when a key is pressed, and goes low when the key is released. The
data outputs keep their states after the key is released. The array can be a 8 x 8 array, but any
smaller size may be used. The KBDP64 handles debouncing and encodes the keys with no
external parts. All timing is internally generated. No external diodes are required in the array to
prevent key ghosting in a two key rollover situation. A .1 uF bypass capacitor is suggested
across the VDD and VSS pins. The part uses the standard 28 pin .3 inch width SOIC package.
Features
• Parallel data output plus data available strobe.
• Fully encodes a key switch array. (up to 8 x 8)
• No external parts required.
• Low power consumption 2 mA typical.
• Last key pressed retained on outputs
• Supply voltage 2.4 to 5.25 volts.
• All timing internally generated.
• 2 Key rollover.
• On chip row input resistors.
• Internal key bounce elimination.
• TTL and CMOS compatible outputs.
• Part is in full production.
• SOIC 28 Pin Package.
• LOW EMI
• ROHS Compliant
Part Number KBDP64
February 2013 Page 1 of 7