Smart refresh device

A smart refresh device comprising:

• an address control block configured to determine and store whether a specific row address is a row hammer address, and invert a first row hammer address and perform an addition/subtraction of an address;
• a repair control block configured to determine and store whether the row hammer address is a repaired address when a first smart refresh signal is activated, and output a stored repair address as a second repair control signal when a second smart refresh signal is activated;
• a repair address storage block configured to store an output address of the address control block when the first smart refresh signal is activated, and output a stored address as a latch address when the second repair control signal is activated;
• a fuse block configured to output a repair signal representing information on a repair address to the repair control block, and output a decoding signal according to the latch address;
• and
• an operator configured to add and subtract the decoding signal according to an addition signal and a subtraction signal when the second repair control signal is activated.