Patent ID: 7561390

Claim:
A semiconductor device comprising: a first semiconductor chip in a package; a second semiconductor chip in the package; a first potential supply line formed in the first semiconductor chip; a second potential supply line formed in the second semiconductor chip; a first protection circuit formed in the first semiconductor chip and connecting the first potential supply line and the second potential supply line; a second protection circuit formed in the second semiconductor chip and connecting the first potential supply line and the second potential supply line; a chip-to-chip connection part; a third potential supply line formed in the second semiconductor chip and connected to the first potential supply line through the chip-to-chip connection part; a fourth potential supply line formed in the first semiconductor chip and connected to the second potential supply line through the chip-to-chip connection part; a third protection circuit formed in the first semiconductor chip and connected between the first potential supply line and the fourth potential supply line; and a fourth protection circuit formed in the second semiconductor circuit chip and connected between the second potential supply line and the third potential supply line.