Invention Grant
- Patent Title: Semiconductor memory device and erase verify operation
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Application No.: US17014695Application Date: 2020-09-08
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Publication No.: US11322212B2Publication Date: 2022-05-03
- Inventor: Takashi Maeda
- Applicant: KIOXIA CORPORATION
- Applicant Address: JP Minato-ku
- Assignee: KIOXIA CORPORATION
- Current Assignee: KIOXIA CORPORATION
- Current Assignee Address: JP Minato-ku
- Agency: Oblon, McClelland, Maier & Neustadt, L.L.P.
- Priority: JPJP2018-172214 20180914
- Main IPC: G11C11/22
- IPC: G11C11/22 ; G11C16/34 ; G11C16/16 ; G11C16/12 ; G11C11/56 ; G11C16/04 ; G11C5/14 ; G11C7/10 ; G11C7/06

Abstract:
A semiconductor memory device according to an embodiment includes a string, a bit line, a well line, and a sequencer. The string includes first and second select transistors, and memory cell transistors using a ferroelectric material. The bit line and the well line are connected to the first and second select transistors, respectively. At a time in an erase verify operation, the sequencer is configured to apply a first voltage to the memory cell transistors, to apply a second voltage lower than the first voltage to the first select transistor, to apply a third voltage lower than the first voltage to the second select transistor, to apply a fourth voltage to the bit line, and to apply a fifth voltage higher than the fourth voltage to the well line.
Information query