Patent ID: 6901002

Claim:
A ferroelectric memory comprising: a memory cell including a ferroelectric capacitor having a ferroelectric film capable of taking different electric capacitances C f0 and C f1 in an initial state and first and second electrodes formed to hold said ferroelectric film therebetween; a circuit applying a read voltage V R to said first electrode; and a detector capable of detecting the difference between the electric capacitances C f0 and C f1 of said ferroelectric film when the potential difference of said second electrode corresponding to the difference between the electric capacitances C f0 and C f1 of said ferroelectric film is in excess of a detection limit voltage V S , wherein the electric capacitance C 2 of said second electrode is set to satisfy the following expression: C f0 <C 2 ≦½×{( C f1 −C f0 ) V R /V S −( C f1 +C f0 )}.