Patent ID: 8913434
Filing Date: 2014-12-16
Classification: G11C

Abstract:
1. A non-volatile memory device comprising: a first memory string including a plurality of non-volatile memory cells coupled between a common source line and a first bit line, the first memory string being one of a plurality of memory strings in the non-volatile memory device; a first string selection transistor coupled between the common source line and the first memory string; a precharge drive circuit configured to provide a first voltage to a gate terminal of the first string selection transistor and provide a second voltage to the common source line during a precharge operation; and a controller configured to determine a word line selection voltage having a voltage level sufficient to turn on a memory cell coupled to a selected word line if the memory cell is in a first state but insufficient to turn on the memory cell if the memory cell is in a second state, wherein the first string selection transistor provides the second voltage to the first memory string in response to the first voltage in order to precharge the first bit line, and wherein the first bit line is precharged if the memory cell is in the first state and not precharged if the memory cell is in the second state.