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IDT Introduces Next-generation FemtoClock™


Flexible Frequency Synthesizers Provide Extremely Low Jitter and Improved Power-Supply Noise Rejection for High-Performance Networking and Telecommunications Applications

SAN JOSE, Calif. – IDT® (Integrated Device Technology, Inc.; NASDAQ: IDTI), a leading provider of essential mixed signal semiconductor solutions that enrich the digital media experience, today introduced the latest member of its FemtoClocks™ family — the FemtoClock Next Generation (NG). This new family of clock synthesizers features very low phase-noise performance and significantly improved power-supply noise rejection, allowing for increased bandwidth when used with serial interfaces. The new FemtoClocks are fully customizable, stand-alone solutions that generate reference frequencies allowing them to replace crystal and SAW oscillators in high-performance applications. Additionally, the new FemtoClocks provide greater design flexibility in networking and telecommunications applications that utilize 10 Gigabit Ethernet, PCI Express, Fibre Channel and SONET interfaces by enabling multiple oscillators to be replaced with a single FemtoClock.

As with previous-generation FemtoClocks, the new IDT timing solutions are designed to work in conjunction with other devices on the board that require a reference clock, such as PHYs, switches, ASICs and network processors. The result of this cohesive nature between devices is a simplified board design and layout, as well as improved time-to-market. Moreover, the family meets the specification requirements of all interface standards, such as 10 Gigabit Ethernet, PCI Express, Fibre Channel and SONET.

The first device offered in this family, the 843N156-125, generates a 125MHz single-ended output and a 156.25MHz LVPECL output from a single 25MHz crystal, replacing two crystal oscillators on the board with one device, providing application architects with increased design flexibility. The typical root-mean-square (RMS) phase noise jitter for both frequencies is 400fS, making these perfect for PCIe, Gigabit Ethernet and 10 Gigabit Ethernet applications, since it gives designers ample margin in their designs to meet the jitter requirements of these standards. Additional FemtoClock NG members will feature output frequencies of up to 1.3GHz, providing integrated silicon solutions with short lead times when compared to crystal and SAW oscillators.

“This new family of FemtoClock devices builds upon the IDT technical expertise in timing solutions,” said Fred Zust, vice president and general manager of the Communications division at IDT. “We are continuing to expand our family of FemtoClock devices by aggressively developing this new family to ensure we provide our customers with the industry’s best solutions, not only on technical merit and end-to-end system solutions, but also including the unparalleled level of support that is bundled with our solutions.”
Pricing and Availability
The 843N156-125device is available for sampling to qualified customers. Price for this device is $4.81 for 1,000 units, and is available in 16 lead TSSOP package. For a full list of all IDT FemtoClock timing products, including packaging information, visit


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