Our any-frequency, any-output format Si5360, Si5391, Si5341, Si5340 clock generators combine a wide-band PLL with proprietary MultiSynth fractional synthesis technology to offer a versatile and ultra-low jitter clock generator platform. With highly flexible architecture, the clock generators are capable of synthesizing a wide range of integer and non-integer related frequencies combinations up to 1300 MHz on up to 18 differential clock outputs, while delivering 55-fs RMS phase jitter performance with 0 ppm error. Each clock output can be assigned to its own output format and output voltage, enabling the consolidation of multiple clock Ics and oscillators into a single device making the clock generators a true clock-tree-on-a-chip.