Flash memory device controlling common source line voltage, program-verify method, and memory system

摘要

Disclosed is a flash memory device and a program-verify method. The flash memory device includes; a plurality of memory cells connected between a bit line and a common source line, and a data input/output circuit connected to the bit line and configured to store program data for a selected one of the plurality memory cells. The data input/output circuit maintains the program data during a program-verify operation and controls a voltage level on the bit line in accordance with the program data.