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Sub-micron high input voltage tolerant input output (I/O) circuit

  • US 20050248892A1
  • Filed: 07/14/2005
  • Published: 11/10/2005
  • Est. Priority Date: 01/09/2001
  • Status: Active Grant
First Claim
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1. An apparatus for generating a first bias voltage, the apparatus comprising:

  • a first input for accepting a pad voltage;

    an second input for accepting a second bias voltage, the second input having a corresponding output, the second bias voltage having a first voltage level when the corresponding output is enabled and having a second voltage level when the corresponding output is disabled; and

    a circuit for providing the first voltage level of the second bias voltage as the first bias voltage when the pad voltage is less the second voltage level of the second bias voltage and for providing the pad voltage as the first bias voltage otherwise, wherein the second voltage level of the second bias voltage is greater than the first voltage level of the second bias voltage.

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