MEMORY CELL

PURPOSE:To prolong the service life of a memory cell by selecting a fixed potential impressed on a pair of confronted electrodes so that almost the same current can flow in a capacitor even if a voltage impressed on the capacitor is positive or negative. CONSTITUTION:Where, in the memory cell with the memory voltage level of a joint between a transistor 10 and the capacitor 20 in a binary state, a 1st voltage, a 2nd voltage, and a voltage impressed on a pole plate 24 not connected to the transistor among pole plates in the capacitor 20 are VH, VL and VP, respectively, the potential of the pole late, which meets an inequarity VL