| 摘要 |
An object is to provide a semiconductor device having a novel structure, which can hold stored data even when not powered and which has an unlimited number of write cycles. A semiconductor device is provided with both a memory circuit including a transistor including an oxide semiconductor (in a broader sense, a transistor whose off-state current is sufficiently small) and a peripheral circuit such as a driver circuit including a transistor including a material other than an oxide semiconductor (in other words, a transistor capable of operating at sufficiently high speed). The peripheral circuit is provided in a lower portion and the memory circuit is provided in an upper portion; thus, the area and size of the semiconductor device can be decreased. |
