Patent ID: 6515839
Filing Date: 2003-02-04
Classification: H01L

Abstract:
An integrated circuit having over-voltage protection, the integrated circuit comprising:a first voltage source capable of providing a first voltage of a first voltage magnitude relative to a voltage reference during operation of said integrated circuit; a second voltage source capable of providing a second voltage of a second voltage magnitude relative to said voltage reference during operation of said integrated circuit, said second voltage magnitude being different from said first voltage magnitude; a plurality of terminals, said plurality of terminals comprising at least one IO pad; and a plurality of protection devices coupled with the plurality of terminals, said plurality of protection devices comprising: at least one parasitic diode formed by a metal oxide semiconductor transistor; and at least one silicon controlled rectifier; wherein the at least one parasitic diode and the at least one silicon controlled rectifier are electrically coupled in parallel between said IO pad and another of said plurality of terminals, and wherein at least a first one of the terminals receives the first voltage and at least a second one of the terminals receives the second voltage during operation of said integrated circuit.