Patents by Inventor Kiyotake Sakurai

Kiyotake Sakurai 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).

  • Patent number: 11742013
    Abstract: Methods and apparatuses for erasing data on a plurality of ferroelectric memory cells in a memory cell array in a memory apparatus are disclosed. An example apparatus includes: a memory cell array including a first plurality of word lines; a digit line; and a plurality of ferroelectric memory cells; a control circuit that provides a section select signal and a word line select signal to select a second plurality of word lines among the first plurality of word lines responsive to an address; and an address decoder that activates the second plurality of word lines. Each ferroelectric memory cell includes: a ferroelectric capacitor having a first terminal coupled to a cell plate node and a second terminal coupled to a selection circuit that couples the digit line to the second terminal responsive to a signal on a corresponding word line of the second plurality of word lines.
    Type: Grant
    Filed: March 24, 2021
    Date of Patent: August 29, 2023
    Assignee: Micron Technology, Inc.
    Inventors: Kiyotake Sakurai, Yasushi Matsubara
  • Publication number: 20210210131
    Abstract: Methods and apparatuses for erasing data on a plurality of ferroelectric memory cells in a memory cell array in a memory apparatus are disclosed. An example apparatus includes: a memory cell array including a first plurality of word lines; a digit line; and a plurality of ferroelectric memory cells; a control circuit that provides a section select signal and a word line select signal to select a second plurality of word lines among the first plurality of word lines responsive to an address; and an address decoder that activates the second plurality of word lines. Each ferroelectric memory cell includes: a ferroelectric capacitor having a first terminal coupled to a cell plate node and a second terminal coupled to a selection circuit that couples the digit line to the second terminal responsive to a signal on a corresponding word line of the second plurality of word lines.
    Type: Application
    Filed: March 24, 2021
    Publication date: July 8, 2021
    Applicant: Micron Technology, Inc.
    Inventors: Kiyotake Sakurai, Yasushi Matsubara
  • Patent number: 11004492
    Abstract: Methods, systems, and devices for cell bottom node reset in a memory array are described. The memory array may include a plurality of ferroelectric memory cells having a cell bottom node and a cell plate opposite the cell bottom node. A zero voltage may be applied to a plurality of digit lines in the memory array. A plurality of word lines may be activated to electrically coupled the plurality of digit lines to cell bottom node of each of the ferroelectric memory cells. Accordingly, the cell bottom node of each of the ferroelectric memory cells may be reset to the zero voltage.
    Type: Grant
    Filed: May 7, 2020
    Date of Patent: May 11, 2021
    Assignee: Micron Technology, Inc.
    Inventors: Kiyotake Sakurai, Yasushi Matsubara
  • Patent number: 10984848
    Abstract: Methods and apparatuses for erasing data on a plurality of ferroelectric memory cells in a memory cell array in a memory apparatus are disclosed. An example apparatus includes: a memory cell array including a first plurality of word lines; a digit line; and a plurality of ferroelectric memory cells; a control circuit that provides a section select signal and a word line select signal to select a second plurality of word lines among the first plurality of word lines responsive to an address; and an address decoder that activates the second plurality of word lines. Each ferroelectric memory cell includes: a ferroelectric capacitor having a first terminal coupled to a cell plate node and a second terminal coupled to a selection circuit that couples the digit line to the second terminal responsive to a signal on a corresponding word line of the second plurality of word lines.
    Type: Grant
    Filed: February 18, 2020
    Date of Patent: April 20, 2021
    Assignee: Micron Technology, Inc.
    Inventors: Kiyotake Sakurai, Yasushi Matsubara
  • Publication number: 20200335147
    Abstract: Methods, systems, and devices for cell bottom node reset in a memory array are described. The memory array may include a plurality of ferroelectric memory cells having a cell bottom node and a cell plate opposite the cell bottom node. A zero voltage may be applied to a plurality of digit lines in the memory array. A plurality of word lines may be activated to electrically coupled the plurality of digit lines to cell bottom node of each of the ferroelectric memory cells. Accordingly, the cell bottom node of each of the ferroelectric memory cells may be reset to the zero voltage.
    Type: Application
    Filed: May 7, 2020
    Publication date: October 22, 2020
    Inventors: Kiyotake Sakurai, Yasushi Matsubara
  • Patent number: 10790004
    Abstract: Embodiments of the disclosure are drawn to apparatuses and methods for generating a refresh address locally at a memory bank. The memory bank may include or be associated with a bank logic circuit that latches an initial refresh address from a global row address bus for a first pump of a refresh operation. The bank logic circuit then updates the latched refresh address received to generate a new refresh address for a second pump of the refresh operation. A memory device may include multiple memory banks that share the global row address bus.
    Type: Grant
    Filed: December 12, 2018
    Date of Patent: September 29, 2020
    Assignee: Micron Technology, Inc.
    Inventors: Kiyotake Sakurai, Takuya Nakanishi, Shinji Bessho
  • Publication number: 20200194056
    Abstract: Embodiments of the disclosure are drawn to apparatuses and methods for generating a refresh address locally at a memory bank. The memory bank may include or be associated with a bank logic circuit that latches an initial refresh address from a global row address bus for a first pump of a refresh operation. The bank logic circuit then updates the latched refresh address received to generate a new refresh address for a second pump of the refresh operation. A memory device may include multiple memory banks that share the global row address bus.
    Type: Application
    Filed: December 12, 2018
    Publication date: June 18, 2020
    Applicant: Micron Technology, Inc.
    Inventors: Kiyotake Sakurai, Takuya Nakanishi, Shinji Bessho
  • Patent number: 10685694
    Abstract: Methods, systems, and devices for cell bottom node reset in a memory array are described. The memory array may include a plurality of ferroelectric memory cells having a cell bottom node and a cell plate opposite the cell bottom node. A zero voltage may be applied to a plurality of digit lines in the memory array. A plurality of word lines may be activated to electrically coupled the plurality of digit lines to cell bottom node of each of the ferroelectric memory cells. Accordingly, the cell bottom node of each of the ferroelectric memory cells may be reset to the zero voltage.
    Type: Grant
    Filed: April 17, 2019
    Date of Patent: June 16, 2020
    Assignee: Micron Technology, Inc.
    Inventors: Kiyotake Sakurai, Yasushi Matsubara
  • Publication number: 20200185020
    Abstract: Methods and apparatuses for erasing data on a plurality of ferroelectric memory cells in a memory cell array in a memory apparatus are disclosed. An example apparatus includes: a memory cell array including a first plurality of word lines; a digit line; and a plurality of ferroelectric memory cells; a control circuit that provides a section select signal and a word line select signal to select a second plurality of word lines among the first plurality of word lines responsive to an address; and an address decoder that activates the second plurality of word lines. Each ferroelectric memory cell includes: a ferroelectric capacitor having a first terminal coupled to a cell plate node and a second terminal coupled to a selection circuit that couples the digit line to the second terminal responsive to a signal on a corresponding word line of the second plurality of word lines.
    Type: Application
    Filed: February 18, 2020
    Publication date: June 11, 2020
    Applicant: Micron Technology, Inc.
    Inventors: Kiyotake Sakurai, Yasushi Matsubara
  • Patent number: 10607678
    Abstract: Methods and apparatuses for erasing data on a plurality of ferroelectric memory cells in a memory cell array in a memory apparatus are disclosed. An example apparatus includes: a memory cell array including a first plurality of word lines; a digit line; and a plurality of ferroelectric memory cells; a control circuit that provides a section select signal and a word line select signal to select a second plurality of word lines among the first plurality of word lines responsive to an address; and an address decoder that activates the second plurality of word lines. Each ferroelectric memory cell includes: a ferroelectric capacitor having a first terminal coupled to a cell plate node and a second terminal coupled to a selection circuit that couples the digit line to the second terminal responsive to a signal on a corresponding word line of the second plurality of word lines.
    Type: Grant
    Filed: February 6, 2019
    Date of Patent: March 31, 2020
    Assignee: Micron Technology, Inc.
    Inventors: Kiyotake Sakurai, Yasushi Matsubara
  • Publication number: 20190311757
    Abstract: Methods, systems, and devices for cell bottom node reset in a memory array are described. The memory array may include a plurality of ferroelectric memory cells having a cell bottom node and a cell plate opposite the cell bottom node. A zero voltage may be applied to a plurality of digit lines in the memory array. A plurality of word lines may be activated to electrically coupled the plurality of digit lines to cell bottom node of each of the ferroelectric memory cells. Accordingly, the cell bottom node of each of the ferroelectric memory cells may be reset to the zero voltage.
    Type: Application
    Filed: April 17, 2019
    Publication date: October 10, 2019
    Inventors: Kiyotake Sakurai, Yasushi Matsubara
  • Publication number: 20190287602
    Abstract: Methods and apparatuses for erasing data on a plurality of ferroelectric memory cells in a memory cell array in a memory apparatus are disclosed. An example apparatus includes: a memory cell array including a first plurality of word lines; a digit line; and a plurality of ferroelectric memory cells; a control circuit that provides a section select signal and a word line select signal to select a second plurality of word lines among the first plurality of word lines responsive to an address; and an address decoder that activates the second plurality of word lines. Each ferroelectric memory cell includes: a ferroelectric capacitor having a first terminal coupled to a cell plate node and a second terminal coupled to a selection circuit that couples the digit line to the second terminal responsive to a signal on a corresponding word line of the second plurality of word lines.
    Type: Application
    Filed: February 6, 2019
    Publication date: September 19, 2019
    Applicant: Micron Technology, Inc.
    Inventors: Kiyotake Sakurai, Yasushi Matsubara
  • Patent number: 10311933
    Abstract: Methods, systems, and devices for cell bottom node reset in a memory array are described. The memory array may include a plurality of ferroelectric memory cells having a cell bottom node and a cell plate opposite the cell bottom node. A zero voltage may be applied to a plurality of digit lines in the memory array. A plurality of word lines may be activated to electrically coupled the plurality of digit lines to cell bottom node of each of the ferroelectric memory cells. Accordingly, the cell bottom node of each of the ferroelectric memory cells may be reset to the zero voltage.
    Type: Grant
    Filed: August 3, 2018
    Date of Patent: June 4, 2019
    Assignee: Micron Technology, Inc.
    Inventors: Kiyotake Sakurai, Yasushi Matsubara
  • Patent number: 10229727
    Abstract: Methods and apparatuses for erasing data on a plurality of ferroelectric memory cells in a memory cell array in a memory apparatus are disclosed. An example apparatus includes: a memory cell array including a first plurality of word lines; a digit line; and a plurality of ferroelectric memory cells; a control circuit that provides a section select signal and a word line select signal to select a second plurality of word lines among the first plurality of word lines responsive to an address; and an address decoder that activates the second plurality of word lines. Each ferroelectric memory cell includes: a ferroelectric capacitor having a first terminal coupled to a cell plate node and a second terminal coupled to a selection circuit that couples the digit line to the second terminal responsive to a signal on a corresponding word line of the second plurality of word lines.
    Type: Grant
    Filed: March 13, 2018
    Date of Patent: March 12, 2019
    Assignee: Micron Technology, Inc.
    Inventors: Kiyotake Sakurai, Yasushi Matsubara
  • Publication number: 20190051343
    Abstract: Methods, systems, and devices for cell bottom node reset in a memory array are described. The memory array may include a plurality of ferroelectric memory cells having a cell bottom node and a cell plate opposite the cell bottom node. A zero voltage may be applied to a plurality of digit lines in the memory array. A plurality of word lines may be activated to electrically coupled the plurality of digit lines to cell bottom node of each of the ferroelectric memory cells. Accordingly, the cell bottom node of each of the ferroelectric memory cells may be reset to the zero voltage.
    Type: Application
    Filed: August 3, 2018
    Publication date: February 14, 2019
    Inventors: Kiyotake Sakurai, Yasushi Matsubara
  • Patent number: 10056129
    Abstract: Methods, systems, and devices for cell bottom node reset in a memory array are described. The memory array may include a plurality of ferroelectric memory cells having a cell bottom node and a cell plate opposite the cell bottom node. A zero voltage may be applied to a plurality of digit lines in the memory array. A plurality of word lines may be activated to electrically coupled the plurality of digit lines to cell bottom node of each of the ferroelectric memory cells. Accordingly, the cell bottom node of each of the ferroelectric memory cells may be reset to the zero voltage.
    Type: Grant
    Filed: August 10, 2017
    Date of Patent: August 21, 2018
    Assignee: MICRON TECHNOLOGY, INC.
    Inventors: Kiyotake Sakurai, Yasushi Matsubara
  • Patent number: 8238181
    Abstract: A semiconductor device includes first and second lines, and a switch between the first and second lines. The switch temporary and electrically connects the first and second lines to each other, when the first signal line is transitioned from a first level to a second level while the second signal line is transitioned from the second level to the first level.
    Type: Grant
    Filed: January 27, 2010
    Date of Patent: August 7, 2012
    Assignee: Elpida Memory, Inc.
    Inventors: Tomohiro Ogasawara, Kiyotake Sakurai
  • Publication number: 20100195417
    Abstract: A semiconductor device includes first and second lines, and a switch between the first and second lines. The switch temporary and electrically connects the first and second lines to each other, when the first signal line is transitioned from a first level to a second level while the second signal line is transitioned from the second level to the first level.
    Type: Application
    Filed: January 27, 2010
    Publication date: August 5, 2010
    Applicant: ELPIDA MEMORY, INC.
    Inventors: Tomohiro OGASAWARA, Kiyotake SAKURAI