Integrated circuit protected against electrostatic overvoltages

  • US 5,515,225 A
  • Filed: 08/04/1994
  • Issued: 05/07/1996
  • Est. Priority Date: 08/06/1993
  • Status: Expired due to Term
First Claim
Patent Images

1. A circuit for protecting a plurality of input/output pads of an integrated circuit associated with a plurality of power supply sources against electrostatic overvoltages, each power supply source being connected to a high voltage pad and a low voltage pad, comprising:

  • a first conductive bus and a second conductive bus;

    a plurality of first diodes coupled to the first conductive bus;

    a plurality of second diodes coupled to the second conductive bus, wherein each of the plurality of input/output pads, at least one high voltage pad, and at least one low voltage pad is connected to an anode of a respective first diode having a cathode connected to the first conductive bus, and to a cathode of a respective second diode having an anode connected to the second conductive bus; and

    a unidirectional clipping device having an anode connected to the second conductive bus, and a cathode connected to the first conductive bus.

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×