Patent ID: 7586186

Claim:
A ball grid array comprising: a semiconductor chip having a plurality of pads; and an interposer for mounting the semiconductor chip on a first surface of the interposer, wherein the interposer includes a plurality of wirings disposed on the first surface and a plurality of ball terminals disposed on a second surface, which is opposite to the first surface, each wiring is connected to a corresponding pad of the semiconductor chip, and is electrically connected to a ball terminal, there being fewer ball terminals than pads, and at least one of ball terminals providing a power supply terminal, or a ground terminal, as a common ball terminal for connecting to at least two of the pads of the semiconductor chip through two of said wirings, wherein: the semiconductor chip includes a plurality of functional circuits, each functional circuit has a power supply and a ground, the pads include a plurality of power supply pads and a plurality of ground pads which respectively correspond to the power supplies and the grounds in the functional circuits, and the power supply pads are commonly connected to a first common ball terminal and/or the ground pads are commonly connected to a second common ball terminal.