Alternative Approaches to 3-Dimensional Packaging and Interconnection
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1 Alternative Approaches to 3-Dimensional Packaging and Interconnection Joseph Fjelstad SiliconPipe, Inc. IC Packaging a Technology in Transition In the past, IC packaging has been considered a formula-matic activity Now, the importance of IC packaging has risen significantly IC package is commonly the limiting factor in chip/system performance Improved IC packaging options and design approach are required to meet future needs and overcome the limitations of current PCBs
2 Perspective Modern Electronics are driven by IC packaging technology Thus far there have been three eras in packaging Through hole DIPs, PGAs Surface mount PQFPs, BGAs Chip Scale Flip Chip, Wafer Level 3D packaging is the dawn of the next era Seeds of 3D packaging were planted in the 1980 s Package Selection Growth
3 3-Dimensional Drivers Consumer demand is for smaller, lighter products with more features. Portable products (e.g cell phones, PDAs, digital cameras etc.) require volumetric system miniaturization and interconnection (VSMI) to meet the demand for increased functionality in less overall space. This is best achieved with 3D packaging technology. Worldwide Mobile Phone Example
4 What is 3D Packaging? Packaging and interconnection technologies that address and utilize all dimensions of space in their construction are embraced by the term 3D packaging. There are several approaches to 3D packaging Stacked chips in packages ICs stacked and interconnected inside the package before encapsulation. Stacked packages packaged chips stacked one atop another Hybrid stacked structures Stacked chip or multi-chip packages that are themselves stacked. Chips in separate packages separated in space but interconnected on multiple planes Benefits of 3D Packaging 3D packaging offers several benefits including: Smaller, Thinner Packages i.e. More silicon functions per cm 3 Significant size and weight reductions Reduced Packaging Costs Reduction in Test Reduction in Number of Components on Assembly Package I/O reduction Reduced Time to Market More freedom is silicon design and mixing of technologies Simplified system level circuit routing to direct chip to chip interconnect. Reduction motherboard size and layer count Reduced System Cost (SiP vs SoC) Higher performance at reduced power
5 Die Stacked Structures Many potential solutions in die stacking. Stacked face up and wire bonded Flip chip stacks Combination flip chip and wire bond Stacked chip structures generally use thinned die (75µm- 200µm) Substrates are normally thin core rigid laminate or flexible substrates. Wire bonding technology modified to allow low loop wire bonding Reverse bonding technology provides solutions Over mold material is thinner to keep height down multiple die within the package. Stacked die technology Source: Amkor
6 Chip Stacking Package Options Stacked Package Structures A few potential solutions for package stacking Stacked lead frame packages TSOPs, DIPs (not common) Stacked Peripheral array packages Examples: Micro Z, etcsp Fold over full area array packages Tessera, Valtronics Applications: Stacked DRAM memory Stacked SRAM and flash Others
7 Stacked Packaging Options Stacked Lead Frame Packages Stacked Packaging Options Stacked Peripheral Array Packages
8 Stacked Package Comparison TSOP Stacked TSOP µz Package 1-die 4-die 2-die Size comparison of stacked package technologies Source: Tessera From PQFP to Stack BGA
9 Finished Structures Folded Package Options
10 Folded Packaging Source: Tessera Stacked Packaging from the 1980s
11 3D for High Speed? Technology Trends: Digital electronics and telecom operating frequencies have entered into the multi-ghz range Currently, the mainstream SERDES data rate is 1.25Gb/s to 5Gb/s and is expected to reach 10Gb/s to 40Gb/s within the next 3-5 years. The entire electronic networking and computer industry, (i.e. High Speed Backplanes, Fiber Channel, InfiniBand, OIF, RapidIO, 3GIO, and XAUI), are moving into multigigabit serial link topologies. Intel P4, CPU frequency is currently 3GHz and could increase to 10GHz in three to five years.
12 IC Packaging Drives Design As on-chip signal speeds rise, the importance of IC packaging has also risen significantly IC package and PCB design, materials and manufacturing practices presently the limiting factors in chip/system performance Improved IC packaging options and PCB design approach are required to meet future performance needs and overcome current limitations But Design Approach Must Change Packaging can no longer be an afterthought Sequential design is out, concurrent design is in Silicon, package and PCB interconnections must be considered together in the design process Design tools are evolving to address the challenge Performance requirements impacting and influencing material choices and reliability More than an IC volume reduction opportunity
13 IC Packaging Challenges/Needs Chip, packaging & substrate co-design Digital & analog mixed signal, transient thermal analysis, thermomechanical analysis, electrical power disturb, signal integrity Organic substrates Tg, dielectric loss, planarity & warpage, processing temperature, (e.g Pb Free impact), moisture absorption Electrostatic Discharge (ESD) control Need for better and alternative ESD control methods Cu/low-k impact on IC packaging Wire bond, FC and underfill on Cu & low-k wafers (adhesion, material strength, etc.) Understanding the Issues High speed means rapid rise times Rise time degradation is a major concern Rise time degradation is caused by: Signal loss Conductor and dielectric loss Impedance Discontinuities Connectors, vias, material changes, mfg defects
14 Performance Limiters PCB Problem Areas
15 Moving Ahead of Moore s Law
16 The Interconnect Gap There is a 10X gap between signal speeds on IC and signal speeds on PC boards. This gap is increasing and rapidly becoming a major technology bottleneck. Traditional chip-based interconnect gap solutions are running out of steam. Problems with traditional copper solutions include signal loss, signal degradation, cross-talk, reflections, power requirements new channel-based solutions are needed. Silicon and optical solutions are being readied but which is right? Unleashing IC Performance
17 How Do You Get There? Chip or Channel? Chip choices Chip solutions use complex signaling technology and higher transmit power to move high-speed chip-to-chip signals over increasing complex PCBs. Limitations on transistors available for I/O and insufficient power budgets prevents I/O design from solving fundamental channel problems. The companies that address chip-to-chip speed issues do so by providing increasingly expensive semiconductor I/O designs requiring more sophisticated SERDES designs, highly engineered packages and increasing power requirements. Channel choices Optical solutions: Challenges for optical: cost, power, heat, manufacturability, conversion cost and business disruption. Copper solutions move chip-to-chip high speed signals through innovative copper alternatives to traditional PC boards. Challenges in copper: new IC packaging techniques, high speed, low power transceivers, new constant-impedance connectors, new ESD in-package techniques and PCB signal loss mitigation.
18 Chip to Chip Disciplines Off the Top (OTT) Interconnection
19 20Gbps Chip-to-Chip Solution Clearing the Channel SiliconPipe, Inc - Copyright 2004 All rights reserved
20 Eye Diagram Comparison SiliconPipe, Inc - Copyright 2004 All rights reserved 20Gbps Channel for Chip-to-Chip Technological Advantages... High speed flex based channel technology enables the link between packages over distances up to 15 inches, with near zero skew at speeds to 20Gbps per channel. (15Gbps/channel packaging for 0.13µm CMOS structures, 20Gbps for 90nm CMOS structures) Chip interconnections are standard in the package is structured as a commodity item allowing many companies to bid for the task Easily standardized interconnection architecture Applicable to various die sizes and performances Increased design flexibility Full compatibility with existing packaging assembly
21 Rethinking Circuit Design Patents Pending OTT Advantage at Test
22 Performance Potential Example of a Perfect Channel
23 Optical Performance - Copper Simplicity Photonic performance Production or in Development Research Electron performance Supercharged Copper Interconnects Production or in Development Research Phone Modems Cable DSL T1 Modems Ethernet Fast T3 OC3 OC12 OC192 OC768 Ethernet 1Gig En 10 Gig En DWDM 1Kb/s 10Kb/s 100Kb/s 1Mb/s 10Mb/s 100Mb/s 1Gb/s 10Gb/s 100Gb/s 1Tb/s 10Tb/s 100Tb/s 1000Tb/s Can Copper Deliver the Promise?
24 I don't see anything to replace copper Shekhar Borkar, Intel fellow Quoted by Jessica Davis in article titled: Intel: Copper Here to Stay -- Electronic News, 6/16/2004 OTT Structures
25 New I/O Placement Off The Top IC Packaging
26 OTT Package (before chip placement) Prototypes
27 Directly from Chip to Chip Connector Option Example
28 Retrofitting Possibilities Retrofitting Possibilities
29 OTT Applications Summary Volumetric interconnection and packaging concepts (3D) appear now to be the only way of meeting the performance, cost and power demands of future generation systems Next generation products require that all elements of interconnection infrastructure work cooperatively together to accomplish shared objectives Approaches to electronic design and manufacture must evolve to meet the needs of next generation performance requirements or you re out of the game.
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