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Browse Prior Art Database

Engineering Change Wiring System for Semiconductor Package

IP.com Disclosure Number: IPCOM000051577D
Original Publication Date: 1981-Feb-01
Included in the Prior Art Database: 2005-Feb-10

Publishing Venue

IBM

Related People

Authors:
Davidson, EE Magdo, S Riseman, J [+details]

Abstract

In large-scale integrated circuit packages, it is known to provide engineering change pads associated with I/O pads on solder-bonded devices mounted on the substrate which provide a means for altering the internal circuitry of the substrate. This concept is described in more detail in 11, 2]. In use, discrete wires are ultrasonically bonded to the engineering change pads which provide additional or alternate wiring capable of connecting the various I/O pads of the devices mounted on the substrate. In more sophisticated packages, this wiring scheme can cause problems because of the excessive cross-talk, uncontrolled characteristic impedance, and propagation velocity associated with the wiring on the surface of the substrate.