The phase change memory device

The phase change memory device, phase change memory cell array comprising a plurality of diode-type phase-change memory cells that are arranged in an array pattern in accordance with an embodiment of the invention; A plurality of word lines coupled to the first end of the plurality of diode-type phase-change memory cell; Said word lines and arranged in a vertical direction, a plurality of bit lines coupled to the plurality of diode-type phase change the second stage of memory cells; And it provided with a plurality of discharge means for connecting / blocking in the discharge voltages of the plurality of bit lines. The discharge means are, connecting the plurality of bit lines to the discharge voltage before the word lines and the bit lines are selected / non-selected for a write operation and the read operation.