Nonvolatile memory device and method for operating the same

PURPOSE: A nonvolatile memory device and a method for operating the same are provided to suppress the variation of the threshold voltage in a memory cell by controlling the potential of an erase voltage. CONSTITUTION: In a nonvolatile memory device and a method for operating the same, a memory block(100) comprises a memory cell unit(110) and a cam cell unit(120). The normal memory cell unit stores program data. The cam cell unit stores the number of a program operation. . A counter(500) generates the number of the program operation. A microcontroller(400) outputs an erase voltage control signal. A pump circuit(600) controls the potential level of an erase voltage.