Patent ID: 7307886

Claim:
A nonvolatile memory device comprising: a memory array having a plurality of memory cells arranged in rows and columns and each executing data storage; a sense amplifier amplifying read data read from the memory cell in said memory array in a data read operation; a write driver providing write data to be written into the memory cell in said memory array in a data write operation; a data line electrically coupled to said sense amplifier and said write driver, and electrically coupled to said memory array for transmitting said read data and said write data in said data read operation and said data write operation, respectively; and an isolation circuit electrically isolating said sense amplifier from said data line in said data write operation, and wherein said write driver has a first field-effect transistor having a gate oxide film, said sense amplifier has a second field-effect transistor having a gate oxide film, and the gate oxide film of said first field-effect transistor is thicker than the gate oxide film of said second field-effect transistor.