Patent ID: 6956759
Filing Date: 2005-10-18
Classification: G11C,H01L

Abstract:
1. A ferroelectric-type nonvolatile semiconductor memory comprising; (A) a bit line, (B) a transistor for selection, (C) a memory unit composed of memory cells that are M in number (M≧2), and (D) plate lines that are M in number, wherein each memory cell comprises a first electrode, a ferroelectric layer and a second electrode, in the memory unit, the first electrodes of the memory cells are in common, and said common first electrode is connected to the bit line through the transistor for selection, in the memory unit, the second electrode of the m-th-place (m=1, 2 . . . , M) memory cell is connected to the m-th-place plate line, and said ferroelectric-type nonvolatile semiconductor memory further comprises a circuit, connected at one end to the common first electrode, for grounding the common first electrode or for short-circuiting the plate lines that are M in number and the common first electrode.