Kioxia Corporation

Kyosuke Sano

Kazutaka Ikegami

Noboru Shibata

Takashi Maeda

Kikuko Sugimae

Katsuya Nishiyama

Yusuke Arayashiki

Rieko Funatsuki

Akiyuki Murayama

Sumiko Domae

Motohiko Fujimatsu

A semiconductor memory device according to an embodiment includes: a driver for supplying a voltage, the driver in the first step, when a current flows through the first substring, the second substring, the third substring, or the fourth substring, performing a second step of applying the first voltage to the bit line, applying a fourth voltage higher than the third voltage to the third select gate line, the fourth select gate line, the fifth select gate line, and the sixth select gate line, and applying a fifth voltage higher than the third voltage and lower than the fourth voltage to the first word lines and the second word lines.

Semiconductor memory device

A semiconductor memory device includes a first memory pillar and a sequencer. The first memory pillar is sandwiched between a first word line and a second word line, sandwiched between a third word line and a fourth word line, sandwiched between a fifth word line and a sixth word line, includes a first memory cell facing the first word line, a second memory cell facing the second word line, a third memory cell facing the third word line, a fourth memory cell facing the fourth word line, a fifth memory cell facing the fifth word line and a sixth memory cell facing the sixth word line. The sequencer executes an erase operation on the first to sixth memory cells to enable execution of a primary write operation for the first memory cell and a primary write operation for the second memory cell at different timings.

According to an embodiment, a circuit in a semiconductor memory device sets threshold voltages of a plurality of memory cells such that two first distributions are formed in a first section on a lowest voltage side in 2sections. After that, the circuit sets threshold voltages of the plurality of memory cells such that 2second distributions are separately formed two by two. The circuit then sets 2third distributions for the 2sections.

Semiconductor memory device and method

A semiconductor memory device of embodiments includes: a substrate; a memory pillar; first to sixth conductive layers provided above the substrate; first to sixth memory cells formed between the first to sixth conductive layers and the memory pillar, respectively; and a control circuit. The control circuit applies a first voltage to the first, second, a sixth conductive layer and applies a second voltage to the third, fifth conductive layer, then applies a third voltage to the first conductive layer, applies a fourth voltage to the sixth conductive layer, and applies a fifth voltage to the second conductive layer, and then applies a sixth voltage to the first conductive layer, applies a seventh voltage to the sixth conductive layer, and applies an eighth voltage lower than the fifth voltage to the second conductive layer.

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Kamakura, Japan

Kyosuke Sano