Patent ID: 8208301

Claim:
A nonvolatile memory device having a common bit line structure, the nonvolatile memory device comprising: a plurality of first selection transistors having a first driving voltage; a plurality of second selection transistors, at least two of which are connected in series with the first selection transistor, and ones of the plurality of second selection transistors having a second driving voltage that is lower than the first driving voltage; a first memory string comprising a first one of the plurality of first selection transistors and a first at least two of the plurality of second selection transistors; a second memory string comprising a second one of the plurality of the first selection transistors and a second at least two of the plurality of second selection transistors; a first string selection line connected to the first one of the plurality of first selection transistors or the first at least two of the plurality of the second selection transistors of the first memory string; a second string selection line connected to the second one of the plurality of first selection transistors or the second at least two of the plurality of second selection transistors of the second memory string; and a common bit line commonly connecting ends of each of the first memory string and the second memory string.