Patents by Inventor William Ip

William Ip 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).

  • Integrated circuit with input/output pad having pullup or pulldown
    Patent number: 5500611
    Abstract: Voltage pullup or pulldown devices of general purpose input/output pads of integrated circuit chips are controlled by signals derived from a core of the chip and which indicate (1) if the pad is to be enabled to output a value and (2) the value of the signal to be outputted. Such devices are controlled to supply different current levels to the input/output terminals as a function of whether the chip is operating in "sleep" and interrupt modes. The device of each pad is disabled when signals or commands are supplied via the pad from the chip to circuitry external to the chip and vice versa.
    Type: Grant
    Filed: September 30, 1994
    Date of Patent: March 19, 1996
    Assignee: Cirrus Logic, Inc.
    Inventors: Kaushik Popat, William Ip, David Sherman