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Electrostatic discharge protection circuit

  • US 20040262689A1
  • Filed: 04/23/2004
  • Published: 12/30/2004
  • Est. Priority Date: 06/27/2003
  • Status: Abandoned Application
First Claim
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1. An electrostatic discharge protection circuit coupled between an I/O pad and an internal circuit of an IC, the electrostatic discharge protection circuit comprising:

  • a first diode having a positive end coupled to the I/O pad, and a negative end coupled to a first supply voltage;

    a second diode having a positive end coupled to a second supply voltage, and a negative end coupled to the I/O pad; and

    a third diode having a positive end coupled to the second supply voltage, and a negative end coupled to the first supply voltage;

    wherein the breakdown voltage of the third diode is substantially smaller than the breakdown voltage of the first diode.

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