Flash memory device having voltage trimming means

The present invention relates to a voltage regulating means comprising a flash memory device. The flash memory device according to the invention comprises a memory cell and a voltage regulation circuit. The memory cell has a one of a plurality of drain voltage state enters in action (Threshold). And wherein said voltage regulation circuit, but provides a number of read voltage or the verify voltage for identifying the drain enters in action (Threshold) voltage state of the memory cell to the memory cell, given the read voltage or the verify voltage in response to a stream information of as long as the voltage can be trimmed. According to the present invention, it can be a constant voltage difference between the voltage read or verify voltage maintained even after the trimming operation.