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High voltage tolerant power up detector

  • US 7,023,248 B2
  • Filed: 05/27/2004
  • Issued: 04/04/2006
  • Est. Priority Date: 05/27/2004
  • Status: Expired due to Fees
First Claim
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1. An apparatus, comprising:

  • a voltage detector circuit coupled to determine when a voltage supply is above a threshold logic level voltage; and

    a high voltage tolerant transistor (“

    HVTT”

    ) having a gate coupled to receive a logic level voltage and a source and a drain to couple between the voltage supply and the voltage detector circuit, the HVTT to shelter the voltage detector circuit from voltages above the logic level voltage when the voltage supply exceeds the logic level voltage, wherein the HVTT comprises a lightly doped drain negative metal oxide semiconductor (“

    LDDNMOS”

    ) transistor.

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