Patent ID: 6741489
Filing Date: 2004-05-25
Classification: G11C,H03K

Abstract:
A data holding device, comprising:a data holding circuit for holding data in a volatile way; a pair of signal lines to which a signal can be applied independently from each other; and a composite capacitor constituted by a pair of ferroelectric capacitors connected in a series, where the connection node is connected to a storage node of the data holding circuit and both ends thereof are connected to the pair of signal lines separately, wherein the polarization status corresponding to the data held in the data holding circuit is held by the pair of ferroelectric capacitors respectively by applying predetermined signals for writing to the pair of signal lines at least before the power supply is stopped; and the data is restored in the data holding circuit based on the potential which is generated in the connection node of the composite capacitor by applying a pair of signals for reading with different potentials to the pair of signal lines when the power supply is restarted.