Semiconductor memory device to hold 5-bits of data per memory cell

A semiconductor memory device comprising:

• a memory cell configured to hold 5-hit data according to a threshold;
• a word line coupled to the memory cell;
• and
• a row decoder configured to apply first to 31st voltages to the word line,
• wherein a first bit data of the 5-bit data is determined by reading operations using first to fourth voltages,
• a second bit data of the 5-bit data is determined by reading operations using fifth to eleventh voltages, the second bit being different from the first bit,
• a third bit data of the 5-bit data is determined by reading operations using twelfth to eighteenth voltages, the third bit being different from the first and second bits,
• a fourth bit data of the 5-bit data is determined by reading operations using nineteenth to 25th voltages, the fourth bit being different from the first to third bits,
• a fifth bit data of the 5-bit data is determined by reading operations using 26th to 31st voltages, the fifth bit being different from the first to fourth bits,
• the first to 31st voltages are respectively different voltages,
• the first voltage is the lowest voltage among the first to 31st voltages,
• the 31st voltage is the highest voltage among the first to 31st voltages,
• the fifth voltage is a second lowest voltage among the first to 31st voltages,
• the 25th voltage is a second highest voltage among the first to 31st voltages,
• the eighteenth voltage a third highest voltage among the first to 31st voltages,
• the fourth voltage is highest among the first to fourth voltages,
• the eleventh voltage is highest among the fifth to eleventh voltages,
• the eighteenth voltage is highest among the twelfth to eighteenth voltages,
• the 25th voltage is highest among the nineteenth to 25th voltages,
• the 31st voltage is highest among the 26th to 31st voltages,
• the fourth voltage is lowest among the fourth voltage, the eleventh voltage, the eighteenth voltage, the 25th voltage, and the 31st voltage,
• the fifth voltage is lowest among the fifth to eleventh voltages,
• the twelfth voltage is lowest among the twelfth to eighteenth voltages,
• the nineteenth voltage is lowest among the nineteenth to 25th voltages,
• the 26th voltage is lowest among the 26th to 31st voltages, and
• the 26th voltage is highest among the first voltage, the fifth voltage, the twelfth voltage, the nineteenth voltage, and the 26th voltage.