Patent ID: 7746114

Claim:
A bus switch for connecting and disconnecting a bus connection that couples a plurality of nodes in a daisy chain manner, the bus connection provided by a pair of buses, a part of the plurality of nodes located on an upstream side of the bus switch and the other part of the plurality of nodes located on a downstream side of the bus switch, the bus switch comprising: a supporting substrate; a first switching element coupled between an input terminal and an output terminal of a high-potential side bus of the pair of buses; a second switching element coupled between an input terminal and an output terminal of a low-potential side bus of the pair of buses, wherein: the bus connection between the part of the plurality of nodes and the other part of the plurality of nodes is connected when the first switching element and the second switching element are activated; the bus connection between the part of the plurality of nodes and the other part of the plurality of nodes is disconnected when the first switching element and the second switching element are deactivated; each of the switching elements includes a plurality of metal-oxide semiconductor transistors and a plurality of resistor elements; the plurality of metal-oxide semiconductor transistors are located on the supporting substrate and is coupled in series between the input terminal and the output terminal of corresponding one of the pair of buses so as to have a common source or a common drain; each of the plurality of resistance elements is coupled between a source and a drain of a respective one of the plurality of metal-oxide semiconductor transistors; each of the switching elements is activated when a predetermined electric current is supplied to the plurality of resistance elements; and each of the switching elements is deactivated when the plurality of resistance elements is deenergized.