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Moderate current 5V tolerant buffer using a 2.5 volt power supply

  • US 7,002,372 B2
  • Filed: 01/20/2004
  • Issued: 02/21/2006
  • Est. Priority Date: 01/20/2004
  • Status: Expired due to Term
First Claim
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1. A low voltage, 5V tolerant buffer, comprising:

  • a series connection of at least three transistors, a terminal of an upper transistor in said series connection being connected to a PAD, and a terminal of a lower transistor of said series connection being connected to ground;

    a bias generator, an output of said bias generator being connected to a gate of said upper transistor; and

    an input stage driven by a node between said central transistor and said lower transistor;

    wherein a gate of a central one of said series connection of three transistors is adapted to be connected to a power supply of no greater than 2.5V nominal; and

    said buffer is a bi-directional buffer.

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