Patents by Inventor Ken Jyo

Ken Jyo 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).

  • Static semiconductor memory device having test mode
    Patent number: 6088820
    Abstract: In an SRAM, a line for applying an internal power supply potential to a memory cell and a line applying an external power supply potential to the portion other than memory cell are separately provided, and an N channel MOS transistor is connected between line for the internal power supply potential and a line for a ground potential. MOS transistor becomes conductive with a predetermined resistance value in a conductive state during test mode. Thus, the potential of line, which has been precharged to internal power supply potential, rapidly decreases to a down-converted potential. Therefore, reduction in time required for a hold test is achieved.
    Type: Grant
    Filed: June 10, 1998
    Date of Patent: July 11, 2000
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Ken Jyo, Shigeki Ohbayashi