Invention Grant
- Patent Title: Semiconductor memory device
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Application No.: US15247916Application Date: 2016-08-26
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Publication No.: US09640274B1Publication Date: 2017-05-02
- Inventor: Shigeo Kondo
- Applicant: KABUSHIKI KAISHA TOSHIBA
- Applicant Address: JP Tokyo
- Assignee: KABUSHIKI KAISHA TOSHIBA
- Current Assignee: KABUSHIKI KAISHA TOSHIBA
- Current Assignee Address: JP Tokyo
- Agency: Patterson & Sheridan, LLP
- Priority: JP2016-051532 20160315
- Main IPC: G11C16/08
- IPC: G11C16/08 ; G11C16/34 ; G11C16/10 ; G11C16/26 ; G11C16/30 ; G11C8/08

Abstract:
A semiconductor memory device includes word lines, bit lines, and memory cells at intersections of the word lines and the bit lines. A driver is configured to a voltage to a selected word line. A sense amplifier is configured to detect data of the memory cells. A controller is configured to control the driver and the sense amplifier. A writing sequence of writing data to a selected memory cell connected to the selected word line includes a plurality of writing loops including a write operation and a verify operation. The controller is configured to perform the write operation on the selected memory cell a predetermined number of times corresponding to write data to be written to the selected memory cell, without the verify operation, after a threshold voltage of the selected memory cell connected to the selected word line reaches a first level.
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