Patent ID: 7872500

Claim:
A semiconductor device comprising: a first circuit portion including: a first circuit that is connected between a first high-side power line and a low-side power line and that outputs a second signal based on a first signal input thereto; and a second circuit portion including: a first transistor that is connected between a second high-side power line and a node and that has a normally-on characteristic; a second circuit that is connected between the node and the low-side power line and that outputs a third signal based on the second signal input thereto, wherein the second circuit portion further includes: a control circuit that is connected between the second high-side power line and the low-side power line and that outputs a fourth signal based on a voltage of the first high-side power line; and a second transistor that is connected between the second high-side power line and the node and that has a control terminal to which the fourth signal is input.