Skhynix Inc.

Chang Jin Sunwoo

Dong Wook Lee

Sung Hoon Cho

Gil Bok Choi

Hwang Huh

Min Sang Park

Myung Su Kim

Yun Bong Lee

Suk Kwang Park

Sang Jo Lee

A method of operating a semiconductor memory device includes performing a first program operation to simultaneously increase threshold voltages of memory cells having different target levels to sub-levels lower than the different target levels, verifying the memory cells by using different verify voltages, respectively, performing a second program operation to divide the threshold voltages of the memory cells, and performing a third program operation to increase the threshold voltages of the memory cells to the different target levels, respectively.

Semiconductor memory device and operating method thereof

Growing community of inventors

Chungcheongbuk-do, South Korea

Chang Jin Sunwoo