Patent ID: 7948725

Claim:
A composite integrated semiconductor device, comprising: inputting means for inputting an input electrical signal; outputting means for outputting an output electrical signal; input surge/noise absorbing means for absorbing surge or noise of the input electrical signal, and being connected between the inputting means and the outputting means, the input surge/noise absorbing means including a first diode being connected between a power source line and the inputting means and a second diode being connected between the power source line and a ground; and attenuating circuits attenuating the input electrical signal, and being connected between the inputting means and the outputting means, wherein a plurality of integrated circuits are formed, each of the plurality of integrated circuits including an input surge/noise absorbing means and an attenuating circuit, and each of the plurality of integrated circuits is integrated in an n type semiconductor substrate, the input surge/noise absorbing means includes at least two vertical type diodes, an anode of one of the at least two vertical type diodes being connected to the inputting means, and an anode of another of one of the at least two vertical type diodes being connected to the ground, and the n type semiconductor substrate is connected to the power source line.