US Patent 7531905 Stacked semiconductor device

A stacked semiconductor device includes an interposer substrate having external power supply terminals, and semiconductor chips stacked on the interposer substrate. A power supply wiring arranged in the semiconductor chip located in the bottom layer is connected to the external power supply terminal via a bump electrode, the power supply wiring arranged in the semiconductor chip located in the top layer is connected to the external power supply terminal via a bonding wire, and the power supply wirings each arranged in adjacent semiconductor chips are mutually connected via the through electrode. Such a loop structure can solve a problem such that the higher the semiconductor chip, the larger its voltage drop.