Patents by Inventor Katsuaki Isobe
Katsuaki Isobe 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).
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Publication number: 20240324216Abstract: According to one embodiment, in a semiconductor memory device including a first chip and a second chip. The first chip includes a first stacked body, a first semiconductor film, a second stacked body, a second semiconductor film, a contact plug and a first planar wiring line. The contact plug extends in the third direction between the first stacked body and the second stacked body. The first planar wiring line is disposed on a side opposite to the second chip with respect to the first stacked body, the contact plug, and the second stacked body, the first planar wiring line extending in the first direction and the second direction, covering at least the contact plug, and being connected to the contact plug.Type: ApplicationFiled: March 6, 2024Publication date: September 26, 2024Applicant: Kioxia CorporationInventors: Hiroyuki YAMASAKI, Masayoshi TAGAMI, Katsuaki ISOBE
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Publication number: 20240096417Abstract: In one embodiment, a semiconductor storage device includes a string that has one end electrically connected to a bit line, and another end electrically connected to a source line, and includes a plurality of memory cells. An operation of writing data to each of a plurality of adjacent first memory cells among the plurality of memory cells is sequentially performed in a direction from a first memory cell on a side of the source line to a first memory cell on a side of the bit line. An operation of reading data from each of the plurality of adjacent first memory cells is performed to allow a current to flow through the string in a first direction from the source line to the bit line.Type: ApplicationFiled: June 20, 2023Publication date: March 21, 2024Applicant: Kioxia CorporationInventors: Hiroshi MAEJIMA, Katsuaki ISOBE, Keita KIMURA
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Publication number: 20240087656Abstract: A semiconductor memory device includes a first memory cell transistor, a first bit line electrically coupled to the first memory cell transistor, a first sense amplifier, and a first latch circuit. The first sense amplifier includes a first node coupled to the first bit line, a first transistor including one end electrically coupled to the first latch circuit, a second node coupled to a gate of the first transistor, and a second transistor coupled between the first and second nodes. The second transistor is in an ON state during an operation of transferring a charge from the first bit line to the first and second nodes in accordance with data of the first memory cell transistor. The second transistor is in an OFF state during an operation of transferring data of the second node to the first latch circuit.Type: ApplicationFiled: June 12, 2023Publication date: March 14, 2024Applicant: Kioxia CorporationInventors: Katsuaki ISOBE, Takeshi HIOKA, Mario SAKO
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Publication number: 20240029807Abstract: A semiconductor storage device includes a bit line, a select gate line, a sense amplifier circuit, a first transistor between the bit line and the sense amplifier circuit, and a second transistor between the bit line and a voltage generation circuit. In a first period of a program operation, the first transistor is turned OFF and the second transistor is turned ON, and a voltage of the first bit line is at a first voltage and a voltage of the select gate line is at a second voltage. In a second period of the program operation, the first transistor is turned ON and the second transistor is turned OFF, and a voltage of the first bit line is at a third voltage less than the first voltage and a voltage of the select gate line is at a fourth voltage greater than the second voltage.Type: ApplicationFiled: February 28, 2023Publication date: January 25, 2024Inventors: Yuki INUZUKA, Katsuaki ISOBE
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Publication number: 20230307434Abstract: A semiconductor memory device according to an embodiment includes a substrate, a first memory cell, a first bit line, a first word line, a first transistor, and a second transistor. The first memory cell is provided above the substrate. The first bit line extends in a first direction. The first bit line is coupled to the first memory cell. The first word line extends in a second direction intersecting the first direction. The first word line is coupled to the first memory cell. The first transistor is provided on the substrate. The first transistor is coupled to the first bit line. The second transistor is provided below the first memory cell and on the substrate. The second transistor is coupled to the first word line.Type: ApplicationFiled: May 31, 2023Publication date: September 28, 2023Applicant: Kioxia CorporationInventors: Hiroshi MAEJIMA, Katsuaki ISOBE, Nobuaki OKADA, Hiroshi NAKAMURA, Takahiro TSURUDO
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Patent number: 11705443Abstract: A semiconductor memory device according to an embodiment includes a substrate, a first memory cell, a first bit line, a first word line, a first transistor, and a second transistor. The first memory cell is provided above the substrate. The first bit line extends in a first direction. The first bit line is coupled to the first memory cell. The first word line extends in a second direction intersecting the first direction. The first word line is coupled to the first memory cell. The first transistor is provided on the substrate. The first transistor is coupled to the first bit line. The second transistor is provided below the first memory cell and on the substrate. The second transistor is coupled to the first word line.Type: GrantFiled: September 4, 2020Date of Patent: July 18, 2023Assignee: Kioxia CorporationInventors: Hiroshi Maejima, Katsuaki Isobe, Nobuaki Okada, Hiroshi Nakamura, Takahiro Tsurudo
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Patent number: 11302398Abstract: According to one embodiment, a first well of the first conductivity type which is formed in a substrate. a second well of a second conductivity type which is formed in the first well. The plurality of memory cells, the plurality of first bit line select transistors, and the plurality of second bit line select transistors are formed in the second well, and the plurality of first bit line select transistors and the plurality of second bit line select transistors are arranged on a side of the sense amplifier with respect to the plurality of memory cells of the plurality of bit lines.Type: GrantFiled: September 17, 2020Date of Patent: April 12, 2022Assignee: KIOXIA CORPORATIONInventors: Katsuaki Isobe, Noboru Shibata, Toshiki Hisada
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Patent number: 11250915Abstract: According to one embodiment, a semiconductor memory includes: a first bit line; a first select transistor having a first terminal connected to the first bit line; a first memory cell connected to a second terminal of the first select transistor; a circuit connected to the first bit line and applying an erase voltage to be applied to the first memory cell to the bit line via the first terminal and the second terminal; and a diode connected to the first bit line and the first circuit.Type: GrantFiled: October 12, 2020Date of Patent: February 15, 2022Assignee: Toshiba Memory CorporationInventors: Hiroshi Maejima, Katsuaki Isobe, Naohito Morozumi, Go Shikata, Susumu Fujimura
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Publication number: 20210118862Abstract: A semiconductor memory device according to an embodiment includes a substrate, a first memory cell, a first bit line, a first word line, a first transistor, and a second transistor. The first memory cell is provided above the substrate. The first bit line extends in a first direction. The first bit line is coupled to the first memory cell. The first word line extends in a second direction intersecting the first direction. The first word line is coupled to the first memory cell. The first transistor is provided on the substrate. The first transistor is coupled to the first bit line. The second transistor is provided below the first memory cell and on the substrate. The second transistor is coupled to the first word line.Type: ApplicationFiled: September 4, 2020Publication date: April 22, 2021Applicant: Kioxia CorporationInventors: Hiroshi MAEJIMA, Katsuaki ISOBE, Nobuaki OKADA, Hiroshi NAKAMURA, Takahiro TSURUDO
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Publication number: 20210027843Abstract: According to one embodiment, a semiconductor memory includes: a first bit line; a first select transistor having a first terminal connected to the first bit line; a first memory cell connected to a second terminal of the first select transistor; a circuit connected to the first bit line and applying an erase voltage to be applied to the first memory cell to the bit line via the first terminal and the second terminal; and a diode connected to the first bit line and the first circuit.Type: ApplicationFiled: October 12, 2020Publication date: January 28, 2021Applicant: Toshiba Memory CorporationInventors: Hiroshi MAEJIMA, Katsuaki ISOBE, Naohito MOROZUMI, Go SHIKATA, Susumu FUJIMURA
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Publication number: 20210005266Abstract: According to one embodiment, a first well of the first conductivity type which is formed in a substrate. a second well of a second conductivity type which is formed in the first well. The plurality of memory cells, the plurality of first bit line select transistors, and the plurality of second bit line select transistors are formed in the second well, and the plurality of first bit line select transistors and the plurality of second bit line select transistors are arranged on a side of the sense amplifier with respect to the plurality of memory cells of the plurality of bit lines.Type: ApplicationFiled: September 17, 2020Publication date: January 7, 2021Applicant: Toshiba Memory CorporationInventors: Katsuaki ISOBE, Noboru SHIBATA, Toshiki HISADA
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Patent number: 10839913Abstract: According to one embodiment, a semiconductor memory includes: a first bit line; a first select transistor having a first terminal connected to the first bit line; a first memory cell connected to a second terminal of the first select transistor; a circuit connected to the first bit line and applying an erase voltage to be applied to the first memory cell to the bit line via the first terminal and the second terminal; and a diode connected to the first bit line and the first circuit.Type: GrantFiled: September 11, 2019Date of Patent: November 17, 2020Assignee: Toshiba Memory CorporationInventors: Hiroshi Maejima, Katsuaki Isobe, Naohito Morozumi, Go Shikata, Susumu Fujimura
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Patent number: 10783971Abstract: According to one embodiment, a first well of the first conductivity type which is formed in a substrate. a second well of a second conductivity type which is formed in the first well. The plurality of memory cells, the plurality of first bit line select transistors, and the plurality of second bit line select transistors are formed in the second well, and the plurality of first bit line select transistors and the plurality of second bit line select transistors are arranged on a side of the sense amplifier with respect to the plurality of memory cells of the plurality of bit lines.Type: GrantFiled: May 24, 2019Date of Patent: September 22, 2020Assignee: Toshiba Memory CorporationInventors: Katsuaki Isobe, Noboru Shibata, Toshiki Hisada
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Publication number: 20200176061Abstract: According to one embodiment, a semiconductor memory includes: a first bit line; a first select transistor having a first terminal connected to the first bit line; a first memory cell connected to a second terminal of the first select transistor; a circuit connected to the first bit line and applying an erase voltage to be applied to the first memory cell to the bit line via the first terminal and the second terminal; and a diode connected to the first bit line and the first circuit.Type: ApplicationFiled: September 11, 2019Publication date: June 4, 2020Applicant: Toshiba Memory CorporationInventors: Hiroshi MAEJIMA, Katsuaki ISOBE, Naohito MOROZUMO, Go SHIKATA, Susumu FUJIMURA
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Publication number: 20190279721Abstract: According to one embodiment, a first well of the first conductivity type which is formed in a substrate. a second well of a second conductivity type which is formed in the first well. The plurality of memory cells, the plurality of first bit line select transistors, and the plurality of second bit line select transistors are formed in the second well, and the plurality of first bit line select transistors and the plurality of second bit line select transistors are arranged on a side of the sense amplifier with respect to the plurality of memory cells of the plurality of bit lines.Type: ApplicationFiled: May 24, 2019Publication date: September 12, 2019Applicant: Toshiba Memory CorporationInventors: Katsuaki Isobe, Noboru Shibata, Toshiki Hisada
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Patent number: 10347341Abstract: According to one embodiment, a first well of the first conductivity type which is formed in a substrate. a second well of a second conductivity type which is formed in the first well. The plurality of memory cells, the plurality of first bit line select transistors, and the plurality of second bit line select transistors are formed in the second well, and the plurality of first bit line select transistors and the plurality of second bit line select transistors are arranged on a side of the sense amplifier with respect to the plurality of memory cells of the plurality of bit lines.Type: GrantFiled: March 5, 2018Date of Patent: July 9, 2019Assignee: TOSHIBA MEMORY CORPORATIONInventors: Katsuaki Isobe, Noboru Shibata, Toshiki Hisada
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Publication number: 20180190359Abstract: According to one embodiment, a first well of the first conductivity type which is formed in a substrate. a second well of a second conductivity type which is formed in the first well. The plurality of memory cells, the plurality of first bit line select transistors, and the plurality of second bit line select transistors are formed in the second well, and the plurality of first bit line select transistors and the plurality of second bit line select transistors are arranged on a side of the sense amplifier with respect to the plurality of memory cells of the plurality of bit lines.Type: ApplicationFiled: March 5, 2018Publication date: July 5, 2018Applicant: Toshiba Memory CorporationInventors: Katsuaki Isobe, Noboru Shibata, Toshiki Hisada
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Patent number: 9953993Abstract: A semiconductor memory device includes a plurality of word lines stacked in a first direction; a semiconductor pillar extending through the plurality of word lines in the first direction; a source line electrically connected to the semiconductor pillar; and a transistor arranged in the first direction with the plurality of word lines. The transistor includes a gate electrode, source and drain regions positioned on both sides of the gate electrode respectively. The source line is positioned between the transistor and the plurality of word lines, and is electrically connected to one of the source and drain regions.Type: GrantFiled: March 13, 2017Date of Patent: April 24, 2018Assignee: TOSHIBA MEMORY CORPORATIONInventors: Tetsuaki Utsumi, Katsuaki Isobe
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Patent number: 9934861Abstract: According to one embodiment, a first well of the first conductivity type which is formed in a substrate. a second well of a second conductivity type which is formed in the first well. The plurality of memory cells, the plurality of first bit line select transistors, and the plurality of second bit line select transistors are formed in the second well, and the plurality of first bit line select transistors and the plurality of second bit line select transistors are arranged on a side of the sense amplifier with respect to the plurality of memory cells of the plurality of bit lines.Type: GrantFiled: March 15, 2017Date of Patent: April 3, 2018Assignee: TOSHIBA MEMORY CORPORATIONInventors: Katsuaki Isobe, Noboru Shibata, Toshiki Hisada
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Publication number: 20180026044Abstract: A semiconductor memory device includes a plurality of word lines stacked in a first direction; a semiconductor pillar extending through the plurality of word lines in the first direction; a source line electrically connected to the semiconductor pillar; and a transistor arranged in the first direction with the plurality of word lines. The transistor includes a gate electrode, source and drain regions positioned on both sides of the gate electrode respectively. The source line is positioned between the transistor and the plurality of word lines, and is electrically connected to one of the source and drain regions.Type: ApplicationFiled: March 13, 2017Publication date: January 25, 2018Applicant: Toshiba Memory CorporationInventors: Tetsuaki UTSUMI, Katsuaki Isobe