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Sub-micron high input voltage tolerant input output (I/O) circuit which accommodates large power supply variations

  • US 20050231864A1
  • Filed: 12/02/2004
  • Published: 10/20/2005
  • Est. Priority Date: 01/09/2001
  • Status: Active Grant
First Claim
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1. An system for protecting an integrated circuit from an over voltage, the system comprising:

  • a control voltage coupled to the integrated circuit;

    a pad voltage from an external voltage source coupled to the integrated circuit at a pad node;

    a bias voltage coupled to the integrated circuit at a bias node;

    a first diode connected device;

    a first switch disposed between the pad node and the bias node;

    a second switch disposed between the pad node and a gate of the first switch; and

    a third switch disposed between the bias node and the gate of the first switch, wherein, if the control voltage has a value less than a predetermined value, the second switch is turned off and the third switch is turned on to thereby turn on the first switch to provide the bias voltage for the integrated circuit at the bias node, and wherein the pad voltage is applied at the bias node as the bias voltage through the first diode connected device and the first switch.

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