| 摘要 |
PURPOSE: To provide a semiconductor memory device where dynamic storage is allowed by a memory cell of a simple transistor. CONSTITUTION: A memory cell MC of 1 bit comprises one MIS transistor formed at a floating silicon layer. In addition to a first gate 13 for channel formation which is provided between a source 15 and a drain 14 of the MIS transistor, a second gate 20 is provided whose electric potential is fixed for controlling the electric potential of the silicon layer 12 by capacity coupling. The MIS transistor dynamically stores a first data status wherein impact-ionization takes place near a drain junction to set the silicon layer 12 to a first electric potential, and a second data status wherein a forward current is allowed to flow the drain junction to set the silicon layer 12 to a second electric potential.
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