AUSTIN, Texas -- Silicon Laboratories Inc. (Nasdaq:SLAB) today announced the Si5320 Cesium(tm) SONET/SDH precision clock multiplier integrated circuit (IC), the industry's first clock multiplier IC capable of generating the ultra low jitter reference clocks required in high-speed SONET/SDH optical port cards and transponder modules. The tiny 9 by 9 mm Si5320 is at least five times smaller than existing solutions based on clock generator modules or discretely implemented analog phase-locked loops (PLLs). In addition, the Si5320 uses Silicon Labs' patented DSPLL(tm) technology to achieve industry-leading jitter generation that is typically 0.25 ps (RMS) in OC-192 applications. This level of performance easily exceeds the strict jitter requirements for reference clocks in today's demanding OC-48, OC-192 and 10 GbE applications. The Si5320 minimizes design complexity and manufacturing issues associated with low jitter clock synthesis circuits. The Si5320 generates standard SONET/SDH reference clocks centered at 19, 155 or 622 MHz from six different input clocks ranging from 19 to 622 MHz. For long haul applications, the Si5320 integrates all the necessary circuitry to translate between standard SONET/SDH reference clock frequencies and their equivalent 15/14 forward error correction (FEC) frequency. This replaces two PLL circuits with one Si5320 IC, saving significant amounts of board space, power and circuit complexity. "With the Si5320, Silicon Labs' Cesium product line now serves the full range of clocking applications in SONET/SDH optical networking equipment. The Cesium products use our DSPLL technology to provide state-of-the-art clock generation in a single IC that meets or exceeds the performance of the best discrete or module based solutions, saving design time, board space, and power," said Jim Templeton, vice president and general manager of Silicon Labs' Optical Networking Division. "We are very pleased with the exceptional market acceptance of our Cesium products. Over 30 of the leading optical companies worldwide have designed in or are evaluating the Si5320." Silicon Laboratories Inc.