Patent ID: 8014114
Filing Date: 2011-09-06
Classification: H01L

Abstract:
1. A semiconductor integrated circuit comprising: a semiconductor substrate of a first general conductive type; a semiconductor layer of a second general conductive type formed on the semiconductor substrate; a first circuit formed on the semiconductor substrate; a first ground pad formed on the semiconductor substrate and receiving a ground voltage; a first ground wiring connecting the first ground pad and the first circuit and supplying the ground voltage to the first circuit; a first power supply wiring supplying a first power supply voltage to the first circuit; a first isolation layer of the first general conductivity type formed in the semiconductor layer so as to isolate part of the semiconductor layer from other part of the semiconductor layer as a first island region of the second general conductivity type; a first electrostatic breakdown protection diode formed between the first power supply wiring and the first ground wiring by connecting the first island region to the first power supply wiring; a second circuit formed on the semiconductor substrate; a second ground pad formed on the semiconductor substrate and receiving the ground voltage; a second ground wiring connecting the second ground pad and the second circuit and supplying the ground voltage to the second circuit; a second power supply wiring supplying a second power supply voltage to the second circuit; a second isolation layer of the first general conductivity type formed in the semiconductor layer so as to isolate part of the semiconductor layer from other part of the semiconductor layer as a second island region of the second general conductivity type; and a second electrostatic breakdown protection diode formed between the second power supply wiring and the second ground wiring by connecting the second island region to the second power supply wiring, wherein the first isolation layer is connected to the first ground wiring in a position that is closer to the first ground pad than to the first circuit.