Memory device with data retention characteristics and operating method thereof

An operating method of a memory device, the operating method comprising:

• activating a first word line from among a plurality of word lines of the memory device, based on reception of an active command from a memory controller;
• storing, in a sense amplifier circuit, first data read from first memory cells of the first word line;
• storing, based on reception of a first command from the memory controller, inverted first data in the first memory cells by inverting the first data stored in the sense amplifier circuit;
• and
• storing, in a storage circuit of the memory device, a first flag indicating a polarity of the first data stored in the first memory cells.

An operating method of a memory device, the operating method comprising:

• activating a word line from among a plurality of word lines of the memory device based on reception of an active command from a memory controller;
• storing, in memory cells of the word line based on the word line being active, inverted data obtained by inverting data of the memory cells of the word line stored in a sense amplifier circuit of the memory device;
• updating, in a first per-row activation counting (PRAC) cell of the memory device corresponding to the word line, an activation count of the word line;
• and
• updating, in a second PRAC cell of the memory device, a flag indicating a polarity of data stored in the memory cells of the word line to a predetermined value, based on the polarity of the data stored in the memory cells of the word line being inverted.