Patents by Inventor Shuuichi Shirata

Shuuichi Shirata 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 integrated circuitry
    Patent number: 6550038
    Abstract: Semiconductor integrated circuitry comprises an I/O circuit for activating an input/output of an internal circuit in response to an external power supply voltage applied thereto, a reference voltage generation circuit for decreasing the external power supply voltage so as to generate a constant reference voltage, a voltage drop circuit for controlling the external power supply voltage so as to decrease it such that it is equal to an input voltage applied thereto, and for supplying the decreased external power supply voltage to the internal circuit, and a mode determination control circuit to which a power supply voltage for test is supplied from a power supply for test that is connected to a power supply terminal for test in test mode, for comparing the power supply voltage for test with a threshold voltage so as to determine whether the semiconductor integrated circuitry is placed in either normal operation mode or the test mode, and for supplying either the reference voltage or the power supply voltage for
    Type: Grant
    Filed: March 23, 2001
    Date of Patent: April 15, 2003
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Shuuichi Shirata
  • Semiconductor integrated circuitry
    Publication number: 20020046388
    Abstract: Semiconductor integrated circuitry comprises an I/O circuit for activating an input/output of an internal circuit in response to an external power supply voltage applied thereto, a reference voltage generation circuit for decreasing the external power supply voltage so as to generate a constant reference voltage, a voltage drop circuit for controlling the external power supply voltage so as to decrease it such that it is equal to an input voltage applied thereto, and for supplying the decreased external power supply voltage to the internal circuit, and a mode determination control circuit to which a power supply voltage for test is supplied from a power supply for test that is connected to a power supply terminal for test in test mode, for comparing the power supply voltage for test with a threshold voltage so as to determine whether the semiconductor integrated circuitry is placed in either normal operation mode or the test mode, and for supplying either the reference voltage or the power supply voltage for
    Type: Application
    Filed: March 23, 2001
    Publication date: April 18, 2002
    Inventor: Shuuichi Shirata