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SiTime's novel MEMS resonator can be wirebonded to any CMOS die inside its package to eliminate external quartz crystals.
Here is what my story in EETimes says about MEMS resonators: Micro-electro-mechanical system (MEMS) resonators can now be integrated inside a semiconductor vendor's own plastic packages, eliminating the need for an external time base like a quartz crystal for real-time clocks. The world's first MEMS resonator for real-time clocks is being offered as a bare-die to CMOS chip makers by SiTime Corp...
Full Text: http://bit.ly/NextGenLog-glVA