Patents by Inventor Akira Urragami

Akira Urragami 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).

  • Level conversion circuitry for a semiconductor integrated circuit
    Patent number: 5495183
    Abstract: In an input level converter for TTL--CMOS level conversion (or other conversion to CMOS) for an internal logic block operating with CMOS levels, an output transistor for executing the charge or discharge of the output capacitance thereof is formed of a bipolar transistor. Thus, the propagation delay times and their capacitance-dependencies of the input level converter can be lessened. Similarly, in an output level converter for CMOS--TTL level conversion (or other conversion from CMOS) for the internal logic block operating with the CMOS levels, an output transistor for executing the charge or discharge of the output load capacitance thereof is formed of a bipolar transistor. Thus, the propagation delay times and their capacitance-dependencies of the output level converter can also be lessened.
    Type: Grant
    Filed: May 12, 1995
    Date of Patent: February 27, 1996
    Assignee: Hitachi, Ltd.
    Inventors: Yukio Suzuki, Ikuro Masuda, Masahiro Iwamura, Shinji Kadono, Akira Urragami, Masayoshi Yoshimura, Toshiaki Matsubara