| 摘要 |
PROBLEM TO BE SOLVED: To provide a semiconductor memory in which a state before cut off can be held for some period even after the cut off of a power source without using a non-volatile memory, a leak current is reduced, and power consumption is reduced. SOLUTION: Before a power source is cut off, a switch 5 is turned on and a switch 6 is tuned off by control voltage of a first control input terminal 7. Next, switches 9, 10 are turned on by control voltage of a second control input terminal 13, a first capacitor 8 stores a state of a feedback loop, while a second capacitor 12 is charged. After a power source is cut off, when a power source is applied again before discharge of the capacitors 8, 12, a state of the feedback loop is made a state before the cut off of a power source by the first capacitor 8. At the time, a switch 11 is turned off by the second capacitor 12, and input data from a data input terminal 3 is cut off. Next, the switches 9, 11 are turned off and the switch 11 is turned on by the second control input terminal 13.
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