US Patent 9570116 Semiconductor device, memory device, and electronic device

To provide a small, highly reliable memory device with a large storage capacity. A semiconductor device includes a circuit for retaining data and a circuit for reading data. The circuit for retaining data includes a transistor and a capacitor. The circuit for reading data is configured to supply a potential to the circuit for retaining data and read a potential from the circuit for retaining data. The circuit for retaining data and the circuit for reading data are provided in different layers, so that the semiconductor device with a large storage capacity is manufactured.