Patent ID: 8395938

Claim:
A semiconductor device comprising: a source line; a bit line extending across the source line; a first signal line; a second signal line; a word line; a memory cell; a first driver circuit electrically connected to the bit line; and a second driver circuit electrically connected to the source line, wherein the memory cell includes a first transistor having a first gate electrode, a first source electrode, and a first drain electrode; a second transistor having a second gate electrode, a second source electrode, and a second drain electrode; and a capacitor, wherein the second transistor includes an oxide semiconductor, wherein the first gate electrode, one of the second source electrode and the second drain electrode, and one of electrodes of the capacitor are electrically connected to each other, wherein the source line is electrically connected to the first source electrode, wherein the bit line is electrically connected to the first drain electrode, wherein the first signal line is electrically connected to the other of the second source electrode and the second drain electrode, wherein the second signal line is electrically connected to the second gate electrode and, wherein the word line is electrically connected to the other of the electrodes of the capacitor.