Nonvolatile semiconductor memory device, method of supplying voltage in the same, and semiconductor device

A semiconductor device, comprising:

• a first voltage generating circuit configured to, during a write operation on memory cells, generate and supply to a memory cell array configured as an arrangement of the memory cells a first voltage from a constant voltage, and to, during a read operation on the memory cells, generate and supply to the memory cell array a second voltage from a power supply voltage;
• a second voltage generating circuit configured to generate the constant voltage;
• and
• a selector circuit configured to, during the write operation, drive the second voltage generating circuit to supply to the first voltage generating circuit the constant voltage, and to, during the read operation, stop the second voltage generating circuit and supply to the first voltage generating circuit the power supply voltage.

A method of supplying voltage in a nonvolatile semiconductor memory device,

• the nonvolatile semiconductor memory device comprising:
• a memory cell array configured as an arrangement of memory cells;
• a first voltage generating circuit configured to generate a first voltage from a constant voltage, or to generate a second voltage from a power supply voltage;
• and
• a second voltage generating circuit configured to generate the constant voltage,
• the method comprising:
• during a write operation on the memory cells, driving the second voltage generating circuit to supply the constant voltage to the first voltage generating circuit, and generating the first voltage in the first voltage generating circuit and supplying the first voltage to the memory cell array;
• and
• during a read operation, stopping the second voltage generating circuit and supplying the power supply voltage to the first voltage generating circuit, and generating the second voltage in the first voltage generating circuit and supplying the second voltage to the memory cell array.