Patent ID: 9076520
Filing Date: 2015-07-07
Classification: G11C,H01L

Abstract:
1. A semiconductor device comprising: a first memory circuit; a second memory circuit comprising a capacitor and a first transistor whose channel is formed in an oxide semiconductor layer, a selection circuit comprising a first input terminal, a second input terminal, and an output terminal; a first switch; and a second switch, wherein at least one of the first memory circuit, the selection circuit, the first switch and the second switch comprises a second transistor whose channel is formed in a single crystal semiconductor, wherein the first transistor is over the second transistor with an insulating layer interposed therebetween, wherein the first input terminal of the selection circuit is electrically connected to the first switch and a first terminal of the first transistor, wherein the second input terminal of the selection circuit is electrically connected to one of a pair of terminals of the capacitor and a second terminal of the first transistor, and wherein the output terminal of the selection circuit is electrically connected to the second switch through the first memory circuit.