Programmable chip to circuit board connection

Details Programmable chip to circuit board connection Programmable chip to circuit board connection

1992-04-20

1993-11-23

Picard, Leo P.

Electricity: conductors and insulators

Conduits, cables or conductors

Preformed panel circuit arrangement

174262, 361777, H05K 100

Patent

active

052646645

ABSTRACT:
A carrier module such as a chip carrier or a circuit board has a matrix of programmable connection pads for attaching a VHDLSI chip. Each pad is encircled by circuit elements (lines or vias) providing different power or signals and one of the lines or vias is selectively connected to the pad to program the connection. The pads have cut outs at the connection points to the vias and/or lines in order to simplify making of connections. The programming connections between the vias and/or lines and the pads are made after pre-finishing the board by depositing evaporated metal to form a bridge between each pad and a via or line selected for each pad. Then a passivation layer of polyimide is deposited on the vias and/or lines with an aperture at the center of each pads so that solder connections to attach the chip to the carrier module do not erroneously bridge to additional vias and/or lines.

REFERENCES:
patent: 4150421 (1979-04-01), Nishihara et al.
patent: 4674182 (1987-06-01), Igarashi
patent: 4723197 (1988-02-01), Takiar et al.
patent: 4729061 (1988-03-01), Brown
patent: 4993954 (1991-02-01), Prevost
patent: 5081561 (1992-01-01), Smith

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