Patent ID: 9087575
Filing Date: 2015-07-21
Classification: G11C,H01L

Abstract:
1. A method of driving a phase change memory device that includes bit lines, variable resistors that are electrically connected to the bit lines, first switching elements that are connected to the variable resistors, second switching elements that are electrically connected to the first switching elements, and memory cells including first word lines that control the first switching elements and second word lines that control second switching elements, the method of driving a phase change memory comprising: when writing the memory cells, grounding the first word lines and writing a first set state and a first reset state by applying a set voltage and a reset voltage preset via the bit lines when the second word lines are floating, and floating the first word line and writing a second set state and a second reset state by applying the set voltage and the reset voltage via the bit lines when the second word lines are grounded.