US Patent 7257028 Temperature compensated bit-line precharge

A nonvolatile semiconductor memory device compensates for temperature changes by holding constant a bit line precharge level. A memory device according to the present invention may include an electrically programmable memory cell array connected to a plurality of word lines and a plurality of bit lines, a bit line voltage supplying circuit for supplying a bit line voltage to the bit lines, a shut-off circuit connecting the memory cell array and the bit line voltage supplying circuit, and a shut-off controlling circuit for controlling the shut off circuit. The shut-off controlling circuit may be constructed to compensate for temperature changes in order to hold the bit-line precharge level constant.