Memory Device, Memory System and Method of Operating Memory Device

A memory device, the memory system and its method of operation are disclosed. Memory device according to one aspect of the technical features of the present disclosure, a memory cell array including a plurality of memory cells, the counting circuit for performing the counting to the data read out from said plurality of memory cells provided a counting result, and the memory without the intervention of the controller may include control logic to perform a data recovery operation in accordance with the counting result of the counting circuit.