A semiconductor integrated circuit capable of effecting data matching at a high speed is provided by using a simple circuit. The semiconductor integrated circuit includes at least one first input terminal and at least one second input terminal to which a voltage signal is inputted, and at least one output terminal. A predetermined signal is produced at the output terminal when the difference between values expressed by the two signals inputted to the first and second input terminals becomes smaller than a predetermined value. The semiconductor integrated circuit of this invention contains at least two inverters constituted of neuron MOS transistors, and the two signals described above or signals obtained by applying predetermined processing to the two signals are inputted to at least one of the input gates of the inverters.