| 摘要 |
Inputs of two buffer circuits which constitute a latch circuit receive different voltages due to a capacitance coupling effect of ferroelectric capacitors or capacitance division of the ferroelectric capacitors, before connected with power source. After the power turns on, a switch control circuit activates switch control signals when a first plate voltage rises to a predetermined voltage. Switch circuits turn on in response to the activation of the switch control signals, and connect power source terminals of the buffer circuits to a power source line. At this time, input voltages of the buffer circuits are different from each other, and therefore, logic data is written into the latch circuit according to each of the input voltages. As a result of this, data held in the latch circuit before turning-off of the power can be reproduced without fail.
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