公开(公告)号：US20220157373A1

公开(公告)日：2022-05-19

申请号：US17399402

申请日：2021-08-11

申请人： SAMSUNG ELECTRONICS CO., LTD.

发明人： Yeonkyu CHOI ,  Dokyun KIM ,  Seongjin LEE ,  Doohee HWANG

IPC分类号： G11C11/406 ,  G11C7/10

摘要： A memory system includes a memory controller and a memory device. The memory controller generates refresh commands periodically by an average refresh interval. The memory device performs a normal refresh operation and a hammer refresh operation during a refresh cycle time. The memory device includes a memory cell array including memory cells connected to a plurality of wordlines, a temperature sensor configured to provide temperature information by measuring an operation temperature of the memory cell array and a refresh controller configured to control the normal refresh operation and the hammer refresh operation. The refresh controller varies a hammer ratio of a unit hammer execution number of the hammer refresh operation executed during the refresh cycle time with respect to a unit normal execution number of the normal refresh operation executed during the refresh cycle time.