Samsung Develops New Stacking Process for DRAM
Samsung has developed the first all-DRAM stacked memory package using 'through silicon via' technology, which will soon result in memory packages that are faster, smaller and consume less power. The new wafer-level-processed stacked package consists of four 512 megabit DDR2 DRAM chips that offer a combined 2 gigabits of high density memory. Using the TSV-processed 2Gb DRAMs, Samsung can create a 4GB DIMM based on advanced WSP technology for the first time. Samsung's proprietary WSP technology not only reduces the overall package size, but also permits the chips to operate faster and use less power.
In today's MCPs, memory chips are connected by wire bonding, requiring vertical spacing between dies that is tens of microns deep. That wire bonding process also requires horizontal spacing on the package board hundreds of microns wide for the die-connecting wires. By contrast, Samsung's WSP technology forms laser-cut micron-sized holes that penetrate the silicon vertically to connect the memory circuits directly with a copper filling, eliminating the need for gaps of extra space and wires protruding beyond the sides of the dies. These advantages permit Samsung's WSP to offer a significantly smaller footprint and thinner package.
Inside the new WSP, the TSV is housed within an aluminum pad to escape the performance-slow-down effect caused by the redistribution layer. Due to the complexity of DRAM stacking, this represented a much more difficult engineering feat than that accomplished with the first WSP, announced last year involving NAND flash dies.
There has been considerable concern that MCPs with high-speed memory chips such as 1.6Gb/ps DDR3, would suffer from performance limitations when connected using current technologies. Samsung's WSP technology resolves these concerns.
In addition, as the back side of the wafer is ground away to make a thinner stack of multiple dies, the wafer has had a tendency to curve, creating physical distortion in the die. To overcome this additional critical concern in designing low-profile, high-density MCPs containing DRAM circuitry, Samsung's proprietary wafer-thinning technology, announced last year, has been applied to improve the thin-die-cutting process.
Advanced package solutions are increasingly important requirements for enabling high-speed, high-density memory solutions. Samsung's new stacked package design supports the rapid industry demand for high density, high performance semiconductor solutions that will support next-generation computing systems in 2010 and beyond.
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