| 摘要 |
PURPOSE:To prevent the damage of an internal circuit due to the static electricity by connecting a drain side and a gate side in an enhancement type FET to one side power source system and connecting a source side to other power source system, concerning the power source of two systems out of the power source of plural systems. CONSTITUTION:Power sources VccA and VccB for internal circuits A and B are held and static electricity protecting circuits EV and EG independent for respective power source systems are provided at the input output terminal of the internal circuits A and B. A drain D side and a gate G side in an enhancement type FET are connected to one side power source system VccA and connected to other side power source system VccB at a source S side. Thus, the internal circuits A and B connected by the power source systems VccA and VccB can be protected from the static electricity with the power source of other system as a reference. |
