Power supplying circuit and phase-change random access memory including the power supplying circuit

The phase change memory device having a power supply circuit, and it is disclosed. The semiconductor memory device according to a first embodiment of the present invention includes a power supply circuit, the switches and the selector. Power supply circuit generates a first voltage and a second voltage that is used in the memory cells of the blocks. Switches are connected to the second line the power supply circuit and in which the first voltage is passing the first line and the second voltage is delivered which, in response to a control signal of the first voltage and the corresponding one of the second voltage It is applied to the block. Selectors are in response to the block select signal and display the charge success signal, and generates the control signal. A power supply circuit and a phase change memory device having the same according to the present invention can reduce the operating time and the operating current of the power supply circuit by providing a separate power switch for each cell block. Further, after the write discharge the charge voltage can be supplied by a voltage of a different level, a malfunction of a phase change memory device protection.