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- W1676841172 abstract "We have developed MCM-L/D for mobile PCs. The MCM-L/D consists of a CPU, a PCIset, a cache, and a power supply section. It incorporates four dies, on of which has a minimum connection pitch of 85 μ m. The dies are connected to a printed-circuit substrate using flip-chip bonding technology. The size of the MCM is 50 x 50 mm. A wire bonding method is used to form Au bumps on the dice. Each die is pushed against a printed-circuit substrate so that the bumps are electrically connected to electrodes on the substrate. An insulating adhesive is then used to affix and seal the die. Conductive paste is applied between the Au bumps and the substrate electrodes to enhance connectivity and increase reliability. The technology we developed secures the reliable connections by using adhesive. Because the reliability of this adhesive is so important, we investigated its properties. We also investigated the deformation properties of the MCM-L/D substrate to optimize the mounting pressure of the flip chip. The connection pitch of dice is getting smaller (from 120 μ m early on to 85 μ m recently) year by year. This trend is likely to continue. We are also developing a technology to meet the demand for smaller pitches (such as 60 μ m). We have succeeded in reducing both the size and weight of the MCM-L/D to one-fourth. We also conducted a feasibility study on smaller pitches (such as 60 μ m)." @default.
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- W1676841172 date "1997-01-01" @default.
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- W1676841172 title "MCM-L/D for Mobile Computer" @default.
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