Clock ICs have phase jitter better than 200 fsec, for PCI Express

December 18, 2013 // By Julien Happich
Micrel’s PL6020xxx and PL6070xxx clock generators, along with the SY7557xL clock distribution family, provide sub-200 fsec phase jitter and output-to-output skew of 50 psec for PCI-Express (PCIe) reference clock signals

Spread Spectrum Technology (SST) in the PL6070xxx is also supported for EMI reduction.  The clock synthesisers accept a fundamental crystal or reference input of 25 MHz and produce output frequencies ranging from 25 MHz to 200 MHz with 100 MHz phase noise performance of -135 dBc at 10 kHz offset. The PCIe clock synthesisers support 2.5V and 3.3V power supply operation offering design flexibility with reduced power dissipation.

The SY75576L and SY75578L clock buffers with four and eight outputs, respectively, provide high performance solutions for new and existing PCIe system designs.  The chips offer ultra-low additive phase jitter of sub-150 fsec with sub-50 psec output-to-output skew for stringent PCI Express based server, storage, and networking applications. 

All devices are production released with Industrial temperature range of ­40°C to +85°C .The ICs have Green, RoHS, and PFOS compliant packaging.  The devices are offered in 6-pin SOT (1 output), 16-pin 3 x 3mm QFN (2 outputs), 24-pin 4 x 4mm QFN (4 outputs), or 44-pin 7 x 7mm QFN (8 outputs) package options.