Twelve-Output Clock Generator With PCIe Gen 7 Spread Spectrum Clocks

Pre-Production Sampling

SiT95272 is a 12 outputs premium programmable clock generator with spread spectrum clocks function capabilities. Leveraging SiTime’s proprietary FOD (Fractional Output Divider) and fully flexible distribution MUX technology, the devices deliver outstanding jitter performance – as low as 110 fs RMS (12K~20MHz) and PCIe Gen 7 performance – making them an exceptional choice for driving high-speed data link, converter circuits and network equipment's, while maintaining low power consumption.

SiT95272 also supports mixed-supply applications, adding to its versatility and making it ideal for a broad array of use cases. With built-in flexibility in frequency, output format, and supply voltage, these devices can consolidate multiple clock ICs and oscillators into a single, multi-frequency clock generator device - simplifying system design and reducing overall timing device component count.

Compatibility is a key strength of SiT95272. It adheres to both high-performance SerDes clocks and PCIe standards, enabling robust system synchronization and PCIe interface communication clocking. This makes SiT95272 series a perfect fit for applications such as wireline infrastructure, data center hardware, and precision instrumentation, positioning it as a critical building block in high-performance, synchronized networks.


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6x6 mm, 48-pin LGA Clock Buffer package
"Specs" "Value"
Operating Temperature Range (°C) -40 to +85
Package Type (mm²) 6.0 x 6.0, 48-pin, LGA
Phase Jitter (rms) 110 fs typ.
Voltage Supply (V) 1.8 to 3.3
Frequency Control DCO 0.1 ppt (all outputs)
Output-Output Skew, Typical 50 ps max
PCIe Support Gen 1 to Gen 7
Features 4 independent SSC capabilities via patented FODs, with programmable down-spread or center-spread options
Availability Pre-Production Sampling
  • Multiple Mode Operations – Buffer, CG, (JA)
  • Fractional Divider supports Any Frequency Out
  • 12 differential outputs
  • Full Flexible Mux Selection
  • Spread Spectrum Clocks
  • GPIO supports
  • PCIe Generation 1-7 compliant, incl. spread-spectrum
  • Programmability
    • OTP (up to 20 custom configurations)
    • In-system thru I2C, SPI
  • Ethernet Switches & Routers
  • Network Interface and Accelerator Cards
  • Video & Image Processing Board
  • Infotainment
  • MFP Control Board
  • IOT Gateway
  • Test & Measurement
  • Radar
  • Laser Distance Meter / Equipment
  • 4K / 8K Camera
  • Module
  • IPC
  • Optical Terminal
  • Radio Access Network
  • Production Control Board / Tool
  • SoC Reference Board
  • Storage
  • Home Appliances
  • Wireline / Linecard
  • ADAS Computers
  • Networked Surveillance Systems
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