Clock ICs offer sub-200fs of phase jitter for PCIe clock applications

Julien Happich -December 31, 2013

Micrel's PL6020xxx and PL6070xxx clock generators, along with the SY7557xL clock distribution family, provide sub-200fs phase jitter for the PCI-Express (PCIe) reference clock signals and output-to-output skew of 50ps.

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

The SY75576L and SY75578L clock buffers with 4 and 8 outputs, respectively, provide high performance solutions for new and existing PCIe system designs.  The chips offer ultra-low additive phase jitter of sub-150fs with sub-50ps 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 3x3mm QFN (2 outputs), 24-pin 4x4mm QFN (4 outputs), or 44-pin 7x7mm QFN (8 outputs) package options.

For more information, visit Micrel.

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This article originally appeared in EE Times Europe.

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