Patent ID: 11869627
Assignee: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 7:
8. A semiconductor device comprising:
a first control circuit comprising a first transistor;
a second control circuit over the first control circuit, the second control circuit comprising a second transistor;
a memory circuit over the second control circuit, the memory circuit comprising a third transistor;
a global bit line and an inverted global bit line, each of which being configured to transmit a signal between the first control circuit and the second control circuit; and
a plurality of change-over switches provided between the global bit line and the second control circuit and between the inverted global bit line and the second control circuit,
wherein a channel of the first transistor is provided in a silicon substrate,
wherein a channel of the second transistor comprises a first metal oxide,
wherein a channel of the third transistor comprises a second metal oxide,
wherein the first control circuit comprises a sense amplifier,
wherein the sense amplifier comprises an input terminal and an inverted input terminal,
wherein in a first period for reading data from the memory circuit to the first control circuit, the second control circuit is configured to control whether electric charge precharged to a 1-bit line and the inverted global bit line is discharged or not in accordance with the data read from the memory circuit,
wherein in the first period, the plurality of change-over switches is switched to make a conducting state between the global bit line and the input terminal and between the inverted global bit line and the inverted input terminal, and
wherein in a second period for refreshing the data read from the memory circuit, the plurality of change-over switches is switched to make a conducting state between the global bit line and the inverted input terminal and between the inverted global bit line and the input terminal.