PCI Express (PCIe) Clock Generators Si522xx and Si521xx

We offer the highest performance, lowest power PCI Express Gen1/2/3/4/5 clock generators on the market. All devices feature low-power, push-pull output buffer technology, providing benefits of low-power consumption, reduced external terminating resistors, and smaller packaging. To optimize performance, PCI Express Gen1/2/3/4/5 clock generators support programmable drive strength, rise/fall times and output impedance, as well as down spread spectrum clock generation. The devices support the standard PCIe HCSL signaling format and can be externally terminated to support LVPECL, LVDS or CML levels. Get started with PCI Express.

PCIe compliant
Output termination resistors
Fully integrated

PCIe Clock Generator Common Specs

  • Complete portfolio of PCI Express Gen1/2/3/4/5 clocks and buffers
  • Wide range of power supply: 1.5 V, 1.8 V, 2.5 V, 3.3 V
  • Push-pull HCSL output buffer technology
  • 12-bit Analog to Digital converter (ADC)
  • Low power conumption
  • Programmable spread spectrum
  • Individual hardware pin for output enable and spread spectrum control
  • I²C/SMBus programmable
  • Supports optional LVPECL, LVDS, or CML levels
  • -40 to +85 °C operation
  • Small form factor QFN and TDFN packaging


Find the PCI Express Clock Select Columns
Select Columns
Part Number Reference Inputs Number of Outputs Output Frequency Output Format(s) Description Control Phase Jitter (RMS) VDD (V) VDDO (V) Package Type Package Size (mm) Clock Generators Jitter Attenuating Clocks Synchronous Ethernet/1588 PCIe Compliant 4G/LTE Wireless Clocks Intel x86 Clocks Spread Spectrum Jitter Recommended Range (fs) Line Impedance Match

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Featured Tool

PCIe Clock Jitter Tool

Quickly and easily take jitter measurements for PCIe Gen1/2/3/4 and SRNS/SRIS.

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