Endcap chip with conductive, monolithic L-connect for multichip stack
First Claim
1. A carrierless endcap chip a multichip stack, said stack including multiple integrated circuit chips laminated together such that at least one principal surface of each integrated circuit chip contacts a principal surface of an adjacent integrated circuit chip in the multichip stack, said endcap chip comprising:
- a substrate of semiconductor material having an upper surface, a lower surface and an edge surface, said edge surface extending in a plane substantially orthogonal to a plane containing said upper surface, and said lower surface contacting a principal surface of an adjacent integrated circuit chip of said stack; and
a conductive, monolithic L-connect integral with the substrate and having a first leg extending at least partially over said upper surface of said substrate and a second leg extending at least partially over said edge surface of said substrate, said second leg having a substantially planar outer surface, wherein when said endcap chip is employed as an end chip within said multichip stack, said conductive, monolithic L-connect electrically interconnects metal on an end face of said multichip stack and metal on a side face of said multichip stack, said side face being parallel to said edge surface of said substrate, and said end face being defined by the upper surface of said substrate.
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Accused Products
Abstract
An endcap chip is provided for a multichip stack comprising multiple integrated circuit chips laminated together. The endcap chip has a substrate with an upper surface and a edge surface, which extends in a plane orthogonal to the upper surface. At least one conductive, monolithic L-connect is disposed over the substrate such that a first leg extends at least partially over the upper surface of the substrate and a second leg extends at least partially over the edge surface of the substrate. When the endcap chip is located at the end of the multichip stack, the at least one conductive, monolithic L-connect electrically connects metal on an end face of the stack to metal on a side face of the stack. A fabrication process is set forth for producing the endcap chip with lithographically defined dimensions.
165 Citations
20 Claims
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1. A carrierless endcap chip a multichip stack, said stack including multiple integrated circuit chips laminated together such that at least one principal surface of each integrated circuit chip contacts a principal surface of an adjacent integrated circuit chip in the multichip stack, said endcap chip comprising:
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a substrate of semiconductor material having an upper surface, a lower surface and an edge surface, said edge surface extending in a plane substantially orthogonal to a plane containing said upper surface, and said lower surface contacting a principal surface of an adjacent integrated circuit chip of said stack; and a conductive, monolithic L-connect integral with the substrate and having a first leg extending at least partially over said upper surface of said substrate and a second leg extending at least partially over said edge surface of said substrate, said second leg having a substantially planar outer surface, wherein when said endcap chip is employed as an end chip within said multichip stack, said conductive, monolithic L-connect electrically interconnects metal on an end face of said multichip stack and metal on a side face of said multichip stack, said side face being parallel to said edge surface of said substrate, and said end face being defined by the upper surface of said substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A multichip stack comprising:
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a plurality of integrated circuit chips laminated together such that at least one principal surface of each integrated circuit chip contacts a principal surface of an adjacent integrated circuit chip; an endcap chip comprised of semiconductor material and having a first principal surface, a second principal surface and an edge surface, said edge surface residing in a plane substantially orthogonal to said first principal surface and said second principal surface, said second principal surface of said endcap chip contacting a principal surface of an end integrated circuit chip of said plurality of integrated circuit chips, said endcap chip further including a conductive, monolithic L-connect integral with said endcap chip and having a first leg extending at least partially over said first principal surface and a second leg extending at least partially over said edge surface, said second leg having a substantially planar outer surface; a first metallization disposed on a side face formed by said plurality of integrated circuit chips and said endcap chip, and a second metallization disposed over an end face defined by said first principal surface of said endcap chip; and wherein said conductive, monolithic L-connect of said endcap chip electrically connects said first metallization on said side face and said second metallization on said end face of said multichip stack. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A carrierless chip of a multichip stack comprising:
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a substrate of semiconductor material having an upper surface, a lower surface and an edge surface, said edge surface extending in a plane substantially orthogonal to a plane containing said upper surface, and said lower surface contacting a principal surface of an adjacent integrated circuit chip of said stack; and a conductive, monolithic L-connect integral with the substrate and having a first leg extending at least partially over said upper surface of said substrate and a second leg extending at least partially over said edge surface of said substrate, said second leg having a substantially planar outer surface, wherein when said chip is employed within said multichip stack, said conductive, monolithic L-connect electrically connects to metal on a side face of said multichip stack, said side face being parallel to said edge surface of said substrate. - View Dependent Claims (20)
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Specification