Patents by Inventor Ralph P. Heron

Ralph P. Heron has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • High voltage tolerant CMOS input/output circuit
    Patent number: 5543733
    Abstract: An input/output circuit communicates an external input signal to an internal signal and converts an internal signal to an external output signal. In one embodiment, the input/output circuit has a power supply terminal, and an input terminal that is coupled to an output terminal via a conductor. A pull-up circuit is coupled to the power supply terminal and the conductor, and includes a PMOS transistor having an N-well, where the pull-up circuit is configured to selectively pull-up the output signal. A pull-down circuit is coupled to a ground terminal and the conductor, and is configured to selectively pull-down the output signal.
    Type: Grant
    Filed: June 26, 1995
    Date of Patent: August 6, 1996
    Assignee: VLSI Technology, Inc.
    Inventors: Derwin W. Mattos, Ralph P. Heron, Donald Lee