Patent ID: 11887669
Assignee: SK HYNIX INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 15:
16. The memory system according to claim 12, wherein the unit program operation is performed in a mode selected among a first mode, a second mode, and a third mode, the first mode to apply the second program pulse to change or adjust a threshold voltage of the at least one non-volatile memory cell by a first level which is equal to, or larger than, a changed level of the threshold voltage, which is caused by the first program pulse; the second mode to apply the second program pulse to change or adjust the threshold voltage of the at least one non-volatile memory cell by a second level which is smaller than the changed level caused by the first program pulse; and the third mode to apply the second program pulse to the at least one non-volatile memory cell of which a change of the threshold voltage is inhibited.