Abstract: An integrated circuit device includes a first power supply domain and a second power supply domain, wherein the first power supply domain includes a first power supply line and a second power supply line, an internal circuit between the first power supply line and the second power supply line, a first clamp circuit that electrically couples between the first power supply line and the second power supply line when a certain potential difference is generated between the first power supply line and the second power supply line, and at least one of a junction element that is between the first clamp circuit and the first power supply line and a junction element that is between the first clamp circuit and the second power supply line, the junction element allowing current to flow when the first clamp circuit becomes electrically conductive.

Abstract: A device for converting a current pulse signal into a voltage pulse signal through a conversion from a current to a voltage includes a converting unit converting the current pulse signal into a first voltage signal, a voltage reducing unit generating a second voltage signal by reducing a magnitude of the first voltage signal, a delay unit generating a third voltage signal by delaying the second voltage signal, and a comparison unit generating the voltage pulse signal by comparing the first voltage signal with the third voltage signal.

Abstract: A device for converting a current pulse signal into a voltage pulse signal through a conversion from a current to a voltage includes a converting unit converting the current pulse signal into a first voltage signal, a voltage reducing unit generating a second voltage signal by reducing a magnitude of the first voltage signal, a delay unit generating a third voltage signal by delaying the second voltage signal, and a comparison unit generating the voltage pulse signal by comparing the first voltage signal with the third voltage signal.

Abstract: A ringtrip judging circuit includes a single comparator for comparing a detection value of a ringing current with a threshold value and for outputting the result of the comparison, a threshold value control circuit for supplying the threshold value to the comparator, and a judging circuit for judging ringtrip based on the output of the comparator. During a prescribed period after ringing signal transmission, the threshold value control circuit changes the threshold value in a steplike manner in accordance with the result of the comparison, thereby determining a threshold value greater than a peak value during the prescribed period, and based on it, determines a threshold value for ringtrip judgement and supplies it to the comparator.

Abstract: An output circuit, for minimizing output idle current fluctuations and improve the output voltage range, has first and second transistors connected to first and second power sources, with a plurality of diodes connected to control terminals of the first and second transistors. The output circuit further includes a third transistor having a first terminal connected to the second power source and a second terminal connected to a predetermined position among the plurality of diodes. A predetermined voltage is applied from the diodes to the control terminal of the first transistor when the third transistor is saturated, to bring a level of an output of said output circuit close to a level of the second power source. A fourth transistor, a fifth transistor, a first resistor, and a capacitor are also provided.