Patents by Inventor Keiichi RYU

Keiichi RYU 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 storage device and driving method thereof
    Patent number: 9336882
    Abstract: A memory includes a cell array including nonvolatile memory cells. A power generator generates a power supply voltage for driving the cell array. A receiver receives a command and an address. A controller controls an active state of the cell array, the power generator, and the receiver. In an activation mode, the cell array, the power generator, and the receiver are turned into the active states. In a first power saving mode, the cell array, the power generator, and the receiver are turned into inactive states. In a second power saving mode, the cell array and the power generator are turned into the active states, and the receiver is turned into the inactive state. In a third power saving mode, at least a part of the power generator is turned into the active state, and the cell array and the receiver are turned into the inactive states.
    Type: Grant
    Filed: May 19, 2014
    Date of Patent: May 10, 2016
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Akira Katayama, Katsuhiko Hoya, Keiichi Ryu, Yasuharu Takagi
  • SEMICONDUCTOR STORAGE DEVICE AND DRIVING METHOD THEREOF
    Publication number: 20140254254
    Abstract: A memory includes a cell array including nonvolatile memory cells. A power generator generates a power supply voltage for driving the cell array. A receiver receives a command and an address. A controller controls an active state of the cell array, the power generator, and the receiver. In an activation mode, the cell array, the power generator, and the receiver are turned into the active states. In a first power saving mode, the cell array, the power generator, and the receiver are turned into inactive states. In a second power saving mode, the cell array and the power generator are turned into the active states, and the receiver is turned into the inactive state. In a third power saving mode, at least a part of the power generator is turned into the active state, and the cell array and the receiver are turned into the inactive states.
    Type: Application
    Filed: May 19, 2014
    Publication date: September 11, 2014
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Akira KATAYAMA, Katsuhiko HOYA, Keiichi RYU, Yasuharu TAKAGI