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KBDSER132 IC Keyboard Encoder Serial Output for up to 132 switches

General Description

The KBDSER132 IC is designed to provide a serial binary output encoder for keyboards up to 132 keys. The KBDSER132 IC contains all the logic necessary to encode a SPST keyboard switch array up to 12 by 11 in size and provide a serial binary output. The output is standard asynchronous format, using 8 bits, 1 stop and no parity at 9600 BPS. Other formats and encoding are available, contact the factory. The array can be a 12 x 11 array, but any smaller size may be used. The KBDSER132 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 and DIP package.


  • Asynchronous serial output.
  • Fully encodes a key switch array. (up to 12 x 11)
  • No external parts required.
  • Low power consumption 5 mA typical.
  • 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 and DIP 28 Pin Package.
  • Low EMI
  • ROHS Compliant

Example Circuits

Spec sheet: Keyboard Encoder Serial output 132 keys

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