Patent ID: 8913433
Filing Date: 2014-12-16
Classification: G11C,H01L

Abstract:
1. A reading method of a nonvolatile memory device including a plurality of strings on a substrate, each one of the plurality of strings being perpendicular to the substrate and including a plurality of memory cells stacked in a direction perpendicular to the substrate, the reading method comprising: applying a bit line voltage to a selected bit line among a plurality of bit lines, the selected bit line connected to a selected string among the plurality of strings; applying a first string selection line voltage to at least one selected string selection line connected to the selected string; applying a second string selection line voltage to at least one unselected string selection line connected to unselected strings among the plurality of strings; applying at least one read voltage to a plurality of word lines connected to the plurality of strings; applying a first ground selection line voltage to at least one selected ground selection line connected to the selected string; and applying a second ground selection line voltage to at least one unselected ground selection line connected to unselected strings among the plurality of strings, wherein each one of the plurality of strings includes the plurality of memory cells on a ground selection transistor, and a string selection transistor on the plurality of the memory cells.