Abstract:
The present invention stacks chip scale-packaged integrated circuits (CSPs) into modules that conserve board surface area. In a two-high CSP stack or module (10) devised in accordance with a preferred embodiment of the present invention, a pair of CSPs (12, 14) is stacked, with one CSP (12) above the other (14). The two CSPs are connected with a pair of flexible circuit structures (30, 32). Each of the pair of flexible circuit structures (30, 32) is partially wrapped about a respective opposite lateral edge (20, 22) of the lower CSP (14) of the module (10). The flex circuit pair (30, 32) connects the upper and lower CSPs (12, 14) and provides a thermal and electrical path connection path between the module (10) and an application environment such as a printed wiring board (PWB). The present invention may be employed to advantage in numerous configurations and combinations of CSPs in modules provided for high-density memories or high capacity computing.
Abstract:
The present invention stacks integrated circuits into modules that conserve board surface area. In a two-high stack or module devised in accordance with a preferred embodiment of the present invention, a pair of integrated circuits is stacked, with one integrated circuit above the other. The two integrated circuits are connected with a pair of flexible circuit structures. Each of the pair of flexible circuit structures is partially wrapped about a respective opposite lateral edge of the lower integrated circuit of the module. The flex circuit pair connects the upper and lower integrated circuits and provides a thermal and electrical path connection path between the module and an application environment such as a printed wiring board (PWB). The present invention may be employed to advantage in numerous configurations and combinations of integrated circuits in modules provided for high-density memories or high capacity computing.
Abstract:
The present invention stacks chip scale-packaged integrated circuits (CSPs) into modules that conserve PWB or other board surface area. In a two-high CSP stack or module devised in accordance with a preferred embodiment of the present invention, two CSPs are stacked, with one CSP disposed above the other. The two CSPs are connected with flex circuitry. A form standard is disposed between the flex circuitry and a CSP in the stack. The form standard can take many configurations and may be used where flex circuits are used to connect CSPs to one another in stacked modules having two or more constituent CSPs. For example, in stacked modules that include four CSPs, three form standards are employed in preferred embodiments, although fewer may be used. The form standard provides a thermally conductive physical form that allows many of the varying package sizes found in the broad family of CSP packages to be used to advantage while employing a standard connective flex circuitry design.
Abstract:
The present invention stacks integrated circuits into modules that conserve board surface area. In a two-high stack or module devised in accordance with a preferred embodiment of the present invention, a pair of integrated circuits is stacked, with one integrated circuit above the other. The two integrated circuits are connected with a pair of flexible circuit structures. Each of the pair of flexible circuit structures is partially wrapped about a respective opposite lateral edge of the lower integrated circuit of the module. The flex circuit pair connects the upper and lower integrated circuits and provides a thermal and electrical path connection path between the module and an application environment such as a printed wiring board (PWB). The present invention may be employed to advantage in numerous configurations and combinations of integrated circuits in modules provided for high-density memories or high capacity computing.
Abstract:
The present invention provides a system and method that mounts integrated circuit devices onto substrates and a system and method for employing such mounted devices for stacked modules. The contact pads of a packaged integrated circuit device are substantially exposed. A solder paste that includes higher temperature solder paste alloy is applied to a substrate or to the integrated circuit device to be mounted. The integrated circuit device is positioned to contact the contacts of the substrate. Heat is applied to create high temperature joints between the contacts of the substrate and the integrated circuit device resulting in a device-substrate assembly with high temperature joints. The formed joints are less subject to re-melting in subsequent processing steps. The method may be employed in devising stacked module constructions such as those disclosed herein as preferred embodiments in accordance with the invention. Typically, the created joints are low in profile.
Abstract:
With the use of stacked modules, a system and method for point to point addressing of multiple integrated memory circuits is provided. A single memory expansion board is populated with stacked modules of integrated circuits. In a preferred embodiment, a four DIMM socket memory access bus that does not employ stacking is replaced with a single DIMM socket bus that supports stacking up to four high on a single DIMM. Although the present invention is preferably employed to advantage using stacked modules comprised from multiple CSPs, it may be employed with modules comprised from any number and type of integrated circuits including any type of packaging, whether CSP or leaded. The stacked modules make use of flexible substrates, low-profile contacts and form standarads for folding substrates.