Patents by Inventor Motoyasu Kitazawa

Motoyasu Kitazawa 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 device
    Patent number: 7049847
    Abstract: A semiconductor device including a tristate buffer circuit, which includes, on an output stage, at least a first transistor (P1) for pull-up driving and a second transistor (N1) for pull-down driving, in which, when a control signal (EN) is of a value indicating an enable state, an output is set to a high level or to a low level, depending on a data signal, and in which, when the control signal is of a value indicating a disable state, the first and second transistors are turned off to set a high impedance state of the output. The semiconductor device further includes a control unit (120, P6, P7) for performing control for speeding up the transition from the on-state to the off-state of the first transistor (P1) at the time of switching the control signal (EN) from the enable state to the disable state.
    Type: Grant
    Filed: April 22, 2004
    Date of Patent: May 23, 2006
    Assignee: NEC Electronics Corporation
    Inventors: Motoyasu Kitazawa, Yasufumi Suzuki, Yasuhiro Tomita
  • Semiconductor device
    Publication number: 20040212398
    Abstract: A semiconductor device including a tristate buffer circuit, which includes, on an output stage, at least a first transistor (P1) for pull-up driving and a second transistor (N1) for pull-down driving, in which, when a control signal (EN) is of a value indicating an enable state, an output is set to a high level or to a low level, depending on a data signal, and in which, when the control signal is of a value indicating a disable state, the first and second transistors are turned off to set a high impedance state of the output. The semiconductor device further includes a control unit (120, P6, P7) for performing control for speeding up the transition from the on-state to the off-state of the first transistor (P1) at the time of switching the control signal (EN) from the enable state to the disable state.
    Type: Application
    Filed: April 22, 2004
    Publication date: October 28, 2004
    Applicant: NEC Electronics Corporation
    Inventors: Motoyasu Kitazawa, Yasufumi Suzuki, Yasuhiro Tomita
  • Semiconductor device
    Patent number: 6377506
    Abstract: A semiconductor device is provided which has a memory provided with a peripheral device that can operate in a versatile manner, irrespective of combinations of storage capacity, numbers of banks and numbers of rows of memory cell arrays to be refreshed. The memory for storing various data, together with circuits to process a variety of signals, is mounted on one semiconductor chip.
    Type: Grant
    Filed: February 14, 2001
    Date of Patent: April 23, 2002
    Assignee: NEC Corporation
    Inventor: Motoyasu Kitazawa
  • Semiconductor Device
    Publication number: 20010021131
    Abstract: A semiconductor device is provided which has a memory provided with a peripheral device that can operate in a versatile manner, irrespective of combinations of storage capacity, numbers of banks and numbers of rows of memory cell arrays to be refreshed. The memory for storing various data, together with circuits to process a variety of signals, is mounted on one semiconductor chip.
    Type: Application
    Filed: February 14, 2001
    Publication date: September 13, 2001
    Applicant: NEC Corporation
    Inventor: Motoyasu Kitazawa