| 摘要 |
PURPOSE: A level converting circuit having an output circuit, a logic circuit, and a operational amp circuit is provided to output an output signal having a frequency width exceeding a tolerant voltage of an MOS transistor. CONSTITUTION: The output circuit including a CMOS inverter circuit, and for outputting an output signal changing at an external supply voltage level based on a binary input signal comprises: a control circuit(2) which supplies a voltage between a voltage low by a threshold voltage of a PMOS transistor(TP) from a voltage level of a high voltage level and another voltage high by a threshold of a NMOS transistor(TN) to the gate of the each transistor as a reference voltage(V3), and sets source voltages of the PMOS transistor as a supply voltage level(V1) of the high voltage level by making rise source voltages of the both transistors by synchronizing when the input signal is a first level, and sets source voltages of the NMOS transistor as a supply voltage level(V2) of the low voltage level by making fall source voltages of the both transistors by synchronizing when the input signal is a second level and lowers a gate-source voltage of the PMOS transistor than the threshold.
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