Low-power clock/attenuator family delivers 25fs-rms jitter performance

Low-power clock/attenuator family delivers 25fs-rms jitter performance

New Products |
By Jean-Pierre Joosting

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Renesas Electronics Corporation has expanded its timing portfolio with a new ultra-low 25fs-rms clock for wireline infrastructure, data center and industrial applications.

The new FemtoClock™ 3 family includes ultra-low jitter clock generators and jitter attenuators with 8 and 12 outputs, enabling high-performance, easy-to-use, and cost-effective clock tree designs for next-generation, high-speed interconnect systems. Target applications for the new devices include telecom switches and routers, top-or-rack data center switches, medical imaging, broadcast audio and video and more.

FemtoClock 3 devices provide industry leading phase noise and jitter required to meet the needs of 112 Gbps SerDes rates, as well as next generation 224 Gbps SerDes designs using commonly available 48 MHz to 73 MHz crystals. The highly integrated devices can generate up to four frequency domains and offer integrated LDOs (Low Drop Out regulators) with superior PSRR, reducing board complexity and cost.

“Renesas leads the industry with best-in-class timing built from decades of experience and patented technology,” said Zaher Baidas, Vice President of the Timing Division for Renesas. “FemtoClock 3 devices extend that leadership by providing multiple clock and synchronization functions in a single device with ultra-low jitter, simplifying printed circuit board design and reducing solution area and cost.”

Key features of the FemtoClock 3 family include:

  • Industry-leading 25fs-rms jitter exceeds next-generation 112 Gbps and 224 Gbps SerDes reference clock requirements.
  • Up to 4 frequency domains allow all system clocks to be generated from a single device.
  • Device variants with jitter attenuation, synchronization and clock generation capabilities and with 8 or 12 outputs.
  • Low power dissipation of 1.2 W and operating a single 1.8 V supply.
  • Integrated non-volatile memory allows for device customization in factory at no additional cost to customer.
  • Small 7- x 7-mm 48-pin VFQFPN and 9- x 9-mm 64-pin VFQFPN packages.
  • Compliant with ITU-T G.8262 and G.8262.1 for enhanced synchronous Ethernet.
  • Single chip with multiple operating modes simplifies overall clock tree.

FemtoClock 3 supports multiple operating modes, including synchronization, jitter attenuation, and clock generation. Customers can combine the new FemtoClock 3 solution with the broader ClockMatrix™, VersaClock, buffer and oscillator portfolio of timing products to address challenging timing needs for their high-performance wireline infrastructure and data center designs.

FemtoClock 3 functions seamlessly in conjunction with the state-of-the-art Renesas IC Toolbox (RICBox) application, empowering users to configure and program devices on the evaluation board. Additionally, RICBox interfaces with the Renesas Lab on the Cloud platform, providing users with the capability to connect virtually to an actual laboratory setting.

Further, Renesas has combined FemtoClock 3 with numerous compatible devices from its portfolio to offer Winning Combinations, including the 1600G Fixed Form Factor Switch. Winning Combinations are technically vetted system architectures from mutually compatible devices that work together seamlessly to bring an optimized, low-risk design for faster time to market.

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