Patent ID: 9692421
Date: 2017-06-27
CPC Classifications: G11C,H01L,H03K

Claim:
1. A semiconductor device comprising: a first transistor; a first circuit including a third transistor; and a second circuit, wherein an output of the first circuit is electrically connected to an input of the second circuit, and an output of the second circuit is electrically connected to an input of the first circuit, wherein the input of the first circuit is electrically connected to a wiring to which an input signal is applied through the first transistor, and the output of the first circuit is electrically connected to a wiring to which an output signal is applied, wherein one of a source electrode and a drain electrode of the first transistor is electrically connected to a gate of the third transistor, and the other of the source electrode and the drain electrode of the first transistor is electrically connected to the wiring to which the input signal is applied, wherein an insulating layer is provided over the third transistor, wherein the first transistor is provided over the insulating layer, wherein a channel formation region of the first transistor comprises an oxide semiconductor, and wherein a channel formation region of the third transistor comprises a silicon.