Patent ID: 9240244
Filing Date: 2016-01-19
CPC Classification: G11C,H01L

Claim Text:
1. A method for driving a semiconductor device comprising a memory cell, wherein the memory cell comprises a first transistor, a second transistor and a capacitor, wherein one of a source and a drain of the first transistor is electrically connected to a gate of the second transistor, wherein the other of the source and the drain of the first transistor is electrically connected to a bit line, wherein one of a source and a drain of the second transistor is electrically connected to the bit line, and wherein the gate of the second transistor is electrically connected to a first electrode of the capacitor, the method comprising the steps of: changing the first transistor from an on-state to an off-state to hold data in the memory cell; changing a potential of a second electrode of the capacitor to turn off the second transistor regardless of a potential of the data; and changing the potential of the second electrode of the capacitor such that the second transistor is turned on and then electrical charge of the bit line is discharged until the second transistor is turned off.