Patent ID: 11903205
Assignee: KIOXIA CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 12:
13. A method for reading data of a first memory cell transistor of a nonvolatile semiconductor memory device, comprising:
applying a first voltage to a gate of a first select transistor of the nonvolatile semiconductor memory device; and
applying a second voltage lower than the first voltage to a gate of a second select transistor of the nonvolatile semiconductor memory device,
wherein the nonvolatile semiconductor memory device has a substrate, a first bit line, a first memory string and a second memory string, the first memory string being coupled with the first bit line, the first memory string extending in a first direction crossing a surface of the substrate, the first memory string having the first select transistor, the first memory cell transistor and a second memory cell transistor coupled in series, the first select transistor being between the first bit line and the first memory cell transistor, the second memory string being coupled with the first bit line, the second memory string having the second select transistor, a third memory cell transistor and a fourth memory cell transistor coupled in series, the second select transistor being between the first bit line and the third memory cell transistor, a gate of the first memory cell transistor being coupled with a gate of the third memory cell transistor, a gate of the second memory cell transistor being coupled with a gate of the fourth memory cell transistor, the gate of the first select transistor not being coupled with the gate of the second select transistor,
wherein the method for reading data of a first memory cell transistor of a nonvolatile semiconductor memory device includes applying a read voltage to the gate of the first memory cell transistor for reading data of the first memory cell transistor and applying a pass voltage to the gate of the second memory cell transistor, the pass voltage being higher than the read voltage.