Patent ID: 8791516
Filing Date: 2014-07-29
Classification: H01L,H03K

Abstract:
1. A semiconductor device comprising: an inverter, the inverter comprising a first transistor having p-type conductivity and a second transistor having an n-type conductivity; a third transistor; and a fourth transistor, wherein a gate of the first transistor is electrically connected to a gate of the second transistor, wherein one of a source and a drain of the first transistor is electrically connected to one of a source and a drain of the second transistor, wherein one of a source and a drain of the third transistor is electrically connected to the other of the source and the drain of the first transistor, wherein the other of the source and the drain of the third transistor is electrically connected to a wiring having a function of supplying first potential, wherein a gate of the third transistor is electrically connected to a gate of the fourth transistor, wherein one of a source and a drain of the fourth transistor is electrically connected to the other of the source and the drain of the second transistor, wherein the other of the source and the drain of the fourth transistor is electrically connected to a wiring having a function of supplying second potential lower than the first potential, and wherein the third transistor, and the fourth transistor comprise an oxide semiconductor.