Voltage switch circuit and nonvolatile memory device using the same

A nonvolatile memory device, comprising:

• a memory cell block;
• a block decoder circuit configured to output a block selection signal having a logic high with a positive voltage and having a logic low with a negative voltage and select the memory cell block in response to a block enable signal;
• and
• an operating voltage transmission unit configured to transfer an operating voltage to the memory cell block in response to the block selection signal,
• wherein the block decoder circuit comprises:
• a block address decoder configured to output an enable signal in response to the block enable signal when an inputted address signal matches an address for the memory cell block;
• a positive voltage supply circuit configured to supply the positive voltage to a control node in response to the enable signal;
• a negative voltage supply circuit configured to supply the negative voltage to the control node in response to a negative voltage enable signal;
• and
• a control signal generation circuit configured to generate the negative voltage enable signal in response to the enable signal,
• wherein the positive voltage supply circuit comprises a depletion transistor and a positive voltage transistor coupled in series between the control node and a terminal to which the positive voltage supplied.