Patents by Inventor Yoshihiro Tsuru

Yoshihiro Tsuru 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).

  • Semiconductor gate array device compatible with ECL signals and/or TTL signals
    Patent number: 5132573
    Abstract: A semiconductor gate array device compatible with ECL and/or TTL, wherein the input buffer unit includes a TTL input stage, an ECL input stage and a common output stage, and the output buffer unit includes a common input stage, an ECL output stage and a TTL output stage. When the device is to be used as a TTL input interface, the TTL input stage and the common output stage are coupled together and when the device is to be used as an ECL input interface, the ECL input stage and the common output stage are coupled together. When used as a TTL output interface, the common input stage and the TTL output stage are coupled together and when used as an ECL output interface, the common input stage and the ECL output stage are coupled together. Therefore, the input/output interfaces exhibit general applicability to meet the user's demands, yet enabling the layout areas of the input and output buffer portions to be decreased.
    Type: Grant
    Filed: November 27, 1990
    Date of Patent: July 21, 1992
    Assignees: Hitachi, Ltd., Hitachi Microcomputer System Ltd.
    Inventors: Yoshihiro Tsuru, Takashi Kuraishi, Fumiaki Matsuzaki, Takaharu Morishige