Patent ID: 7681309

Claim:
A method for interconnecting an integrated circuit (IC) multiple die assembly to conductors on a substrate for conveying signals there between, the method comprising: providing a first IC comprising first terminals on a first surface of the first IC, the first terminals comprising a first set of the first terminals and a second set of the first terminals, elongate, spring conductive contacts being attached at a first end directly to the second set of the first terminals, each elongate contact being a compressible spring; providing a secondary IC comprising a second surface and a third surfaced opposite the second surface, the secondary IC further comprising second terminals on the second surface; attaching the second terminals on the secondary IC die directly to the first set of the first terminals on the first surface of the first IC die to form a multiple die assembly having signal path connections between the secondary IC die and the first IC die in which the second surface of the secondary IC directly faces the first surface of the first IC and the third surfaced of the secondary IC faces away from the first surface of the first IC, wherein the secondary IC die is smaller than the first surface of the first IC die; and mounting the multiple die assembly on a fourth surface of the substrate with the first surface of the first IC die facing the fourth surface of the substrate such that a free end of each elongate contact is brought into direct physical contact with the conductors on the fourth surface of the substrate, wherein the elongate contacts can convey the signals between the first IC die and the conductors on the fourth surface of the substrate, wherein the secondary IC die and the elongate conductive contacts are located entirely between the first surface of the first IC die and the fourth surface of the substrate, and each elongate conductive contact extends from the first surface of the first IC past the second surface and the third surface of the secondary IC die to the free end.