| 摘要 |
A semiconductor integrated circuit operates at two or more supply potentials including a first supply potential and a second supply potential that is higher than the first supply potential, and includes (1) an internal circuit that operates at the first supply potential, (2) an inverter that inverts a control signal fed from the internal circuit and outputs the inverted control signal, when the first supply potential is fed, (3) a level-shifting circuit that inputs the control signal to a first input terminal, while inputting the inverted control signal to a second input terminal, and outputs, from an output terminal, a level-shifted signal of the signal inputted to the first or the second terminal, when the second supply potential is fed, (4) a first input circuit that performs a logical operation on the basis of an input signal inputted via an input pad and a level-shifted signal outputted from the level-shifting circuit, when the second supply potential is fed, thereby outputting a signal corresponding to the input signal when the control signal is activated, while fixing the output level when the control signal is deactivated and (5) a second input circuit that operates on the basis of the signal outputted from the first input circuit when the first supply potential is fed, thereby feeding a signal to the internal circuit.
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