| 摘要 |
A first switch operates in accordance with a control signal and receives an input signal. A voltage conversion circuit converts the input signal having a voltage and transmitted via the first switch to an output signal having a different voltage, and outputs the signal. A second switch connects an output node thereof to a voltage line supplied with a voltage which the voltage conversion circuit should output in accordance with the input signal. Therefore, even the input signal's voltage falling outside the range in which the voltage conversion circuit normally operates, the voltage that the voltage conversion circuit should intrinsically output is supplied to the output node via the second switch. Thus, reliable conversion of the input signal voltage is achieved, resulting in secure operation of the level shifter even during a low power supply voltage. This also prevents malfunction of the semiconductor integrated circuit incorporating such level shifters.
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