FLASH MEMORY DEVICE AND OPERATING METHOD THEREOF

摘要

PURPOSE: A flash memory device and an operating method thereof are provided to accurately sense an amount of currents reflecting data stored in a memory cell by constantly controlling a bit line current corresponding to data in a read operation. CONSTITUTION: A memory cell string is formed by serially connecting a plurality of memory cells between a bit line and a source line. A page buffer(730) senses data and precharges the bit line. A power supply unit(740) supplies a preset power voltage through a source line before a precharging operation. A source line driving unit(720) drives the source line as a ground power voltage in an evolution operation of the bit line.