SEMICONDUCTOR DEVICE AND METHOD FOR DRIVING THE SAME

摘要

A novel semiconductor device where multilevel data can be written and read. The semiconductor device includes first to fifth transistors, a capacitor, a bit line, and a power supply line. Write operation is performed in such a manner that first data is supplied to a gate of the fifth transistor through the first transistor; the first transistor is turned off; second data is supplied to a second electrode of the capacitor through the second transistor to convert the first data into third data; and the second electrode of the capacitor are made electrically floating. The second electrode of the capacitor is initialized to GND through the third transistor. Read operation is performed by charging or discharging the bit line through the fourth transistor and the fifth transistor. The first to third transistors are preferably oxide semiconductor transistors.

主权项

1. A semiconductor device comprising:
a first transistor, a second transistor, a third transistor, a fourth transistor, and a fifth transistor; a first node and a second node; a capacitor; a bit line; and a power supply line, wherein: the first node is supplied with first data of M bits through the first transistor (M is a natural number of 1 or more), the first node is electrically connected to a first electrode of the capacitor and a gate of the fifth transistor, the second node is supplied with second data of N bits through the second transistor (N is a natural number of 1 or more), the second node is supplied with a first potential through the third transistor, the second node is electrically connected to a second electrode of the capacitor, one of a source and a drain of the fifth transistor is electrically connected to the power supply line, and the other of the source and the drain of the fifth transistor is electrically connected to the bit line through the fourth transistor.