| 摘要 |
PURPOSE: A semiconductor integrated circuit is provided, which is appropriate for assuring a noise margin by operating two inputted signals using a Schmitt trigger circuit. CONSTITUTION: The first Schmitt trigger part(21) inverts the second signal inputted through a gate according to the first reference voltage level and the second reference voltage level. An inverter(22) inverts an output signal of the first Schmitt trigger part and then outputs it. A switching part(23) switches the first signal by output signals of the first Schmitt trigger part and the inverter. The second Schmitt trigger part(25) inverts an output signal of the switching part according to the first reference voltage level and the second reference voltage level. And a PMOS transistor(24) connects a power supply voltage(VDD) and a final output port through a source-drain path by the output signal of the inverter.
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