Abstract: A cost-effective packaging system (10) for ultra high density input/output (integrated circuits (14). The packaging system includes a first circuit chip (14) that has a first pattern of contacts (16) distributed across a surface area of the chip (14). The first pattern of contacts (16) represents input/output connections (16). A three-dimensional circuit (18) is disposed spatially parallel with respect to the first circuit chip (14) and organizes the input/output connections (16) into a second pattern of contacts (24, 30) suitable for connection to a second circuit (22). In a specific embodiment, the three-dimensional circuit (18) is a double sided DECAL (18). The double-sided DECAL (18) includes a substrate (18) having a first circuit pattern (28) spatially parallel with a second circuit pattern (30) on or in the substrate (18). The first and second circuit patterns (28 and 30) are interconnected.