Samsung Electronics has announced it has developed an all-DRAM stacked memory package using "through silicon via" (TSV) technology.

The new wafer-level-processed stacked package (WSP) consists of four 512Mb DDR2 chips that offer a combined 2Gb of high density memory. Using the TSV-processed 2Gb DRAMs, Samsung can create a 4GB DIMM.

In today's MCPs, memory chips are connected by wire bonding, requiring vertical and horizontal spacing between dies. 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 (Al) pad to escape the performance-slow-down effect caused by the redistribution layer.

By: DocMemory
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