SEMICONDUCTOR DEVICE AND DRIVING METHOD THEREOF
First Claim
1. A semiconductor device comprising:
- a non-volatile memory cell including a first transistor, a second transistor, and a capacitor,wherein a first semiconductor material included in the first transistor is different from a second semiconductor material included in the second transistor,wherein the first semiconductor material is an oxide semiconductor,wherein one of a source and a drain of the first transistor is electrically connected to the capacitor and a gate of the second transistor, andwherein the non-volatile memory cell is configured to hold data for at least longer than or equal to 1×
104 seconds without power supply.
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Accused Products
Abstract
A semiconductor device has a non-volatile memory cell including a write transistor which includes an oxide semiconductor and has small leakage current in an off state between a source and a drain, a read transistor including a semiconductor material different from that of the write transistor, and a capacitor. Data is written or rewritten to the memory cell by turning on the write transistor and applying a potential to a node where one of a source electrode and drain electrode of the write transistor, one electrode of the capacitor, and a gate electrode of the read transistor are electrically connected to one another, and then turning off the write transistor so that the predetermined amount of charge is held in the node.
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Citations
17 Claims
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1. A semiconductor device comprising:
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a non-volatile memory cell including a first transistor, a second transistor, and a capacitor, wherein a first semiconductor material included in the first transistor is different from a second semiconductor material included in the second transistor, wherein the first semiconductor material is an oxide semiconductor, wherein one of a source and a drain of the first transistor is electrically connected to the capacitor and a gate of the second transistor, and wherein the non-volatile memory cell is configured to hold data for at least longer than or equal to 1×
104 seconds without power supply. - View Dependent Claims (2, 3, 4, 5)
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6. A driving method of a semiconductor device comprising a non-volatile memory cell including a first transistor, a second transistor, and a capacitor,
wherein a first semiconductor material included in the first transistor is different from a second semiconductor material included in the second transistor, wherein the first semiconductor material is an oxide semiconductor, and wherein one of a source and a drain of the first transistor is electrically connected to the capacitor and a gate of the second transistor, the driving method comprising the steps of: -
in a first write period, applying a first potential to the gate of the second transistor and the capacitor through the first transistor, whereby first charge is held in the capacitor and the gate of the second transistor; and in a second write period, applying a second potential to the gate of the second transistor and the capacitor which are holding the first charge through the first transistor, whereby second charge is held in the capacitor and the gate of the second transistor, without an erasing operation between the first write period and the second write period. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A driving method of a semiconductor device comprising a non-volatile memory cell including a first transistor, a second transistor, and a capacitor,
wherein a first semiconductor material included in the first transistor is different from a second semiconductor material included in the second transistor, wherein the first semiconductor material is an oxide semiconductor, and wherein one of a source and a drain of the first transistor is electrically connected to the capacitor and a gate of the second transistor, the driving method comprising the steps of: -
in a first write period, applying a first potential to the gate of the second transistor and the capacitor through the first transistor by turning on the first transistor, whereby first charge is held in the capacitor and the gate of the second transistor by turning off the first transistor; and in a second write period, applying a second potential to the gate of the second transistor and the capacitor which are holding the first charge through the first transistor by turning on the first transistor, whereby second charge is held in the capacitor and the gate of the second transistor by turning off the first transistor, without an erasing operation between the first write period and the second write period. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification