Patent ID: 8576629

Claim:
An operating method of a nonvolatile memory device which includes a plurality of cell strings, each cell string including a first selection transistor, a plurality of memory cells, and a second selection transistor stacked in a direction perpendicular to a substrate, the operating method comprising: programming the first selection transistors of the plurality of cell strings; and programming the plurality of memory cells of the plurality of cell strings, wherein programming the first selection transistors comprises: supplying a first voltage to a first bit line connected with a first selection transistor to be programmed and a second voltage to a second bit line connected to a different first selection transistor to be program inhibited; turning on the second selection transistors of the plurality of cell strings; and supplying a first program voltage to a selected first selection line among a plurality of first selection lines connected with the first selection transistors and a third voltage to an unselected first selection line among the plurality of first selection lines.