Patent ID: 7768811

Claim:
A ferroelectric memory apparatus which stores data, said ferroelectric memory apparatus comprising: a ferroelectric memory; a temperature sensor which detects a temperature of said ferroelectric memory apparatus; a controller operable to output a control signal indicating a voltage, the voltage increasing as the temperature detected by said temperature sensor decreases, and the voltage decreasing as the temperature detected by said temperature sensor increases; and a voltage generator operable to generate the voltage indicated by the control signal outputted by said controller, and to supply the generated voltage to said ferroelectric memory, wherein said controller is operable to output the control signal only when said temperature sensor detects a temperature that exceeds a temperature range within which a write operation and a read operation can be assured using a fixed voltage, and wherein the ferroelectric memory writes and reads data using a fixed voltage when said temperature sensor detects a temperature that is within the temperature range within which a write operation and a read operation can be assured using a fixed voltage.