Diodes Incorporated
Back to PCI Express (PCIe) Clock Generators


19-Output PCIe 5.0/6.0 Clock Generator With On-chip Termination

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The PI6CG330440 is a 19-output very low jitter clock generator. It takes an reference input to generate 25MHz and 100MHz outputs. The on-chip termination can save 80 external resistors and make layout easier. Individual OE pin for each output provides easier power management. It uses Diodes' proprietary design to achieve very low jitter that meets PCIe 1.0/2.0/3.0/4.0/5.0 clock requirements. 


  • Supports Intel's CK440Q spec
  • 3.3V supply voltage
  • 25MHz crystal or an input from a XO / TCXO / OCXO for
    meeting customer specific PPM requirements
  • 19 differential clock output pairs @ 1.4V differential into PCI
    Express* (PCIe*) compliant test load
  • 7 dedicated 100MHz outputs
  • 3 dedicated 25MHz outputs
  • 9 selectable outputs capable of driving 25M or 100MHz
  • 85Ω Differential drivers
  • Programmable SSC on the 100 MHz
  • SMBus Programmable Configurations with multiple SMBus
  • Two Tri-level Addresses Selection (9 SMBus Addresses)
  • PCIe compatible OE# control on 7 pins, and 3 wire shift / load
    control on all outputs
  • Very low jitter outputs: 0.08 ps effective phase jitter after PCIe
    5.0 transfer function
  • Dedicated pins for Platform Time Input & Output (PFT_IN &
    PFT_OUT) clocking
  • Totally Lead-Free & Fully RoHS Compliant 
  • Halogen and Antimony Free. “Green” Device
  • For automotive applications requiring specific change control
    (i.e. parts qualified to AEC-Q100/101/200, PPAP capable, and
    manufactured in IATF 16949 certified facilities), please contact
    us or your local Diodes representative.
  • Packaging (Pb-free & Green):
    • 100-Contact, 8 x 8 mm UQFN (ZUD)

Product Specifications

Product Parameters

Function Generator
Compliance(Only Automotive supports PPAP) Standard
Input Type(s) Crystal, CMOS
Additive Jitter (ps) 0.05
Number of Outputs 19
Maximum Output Frequency (MHz) 25, 100
Output Type(s) Low Power HCSL
Skew (PS) 25
Supply Voltage (V) 3.3
Ambient or Junction Temperature (°C) -40 to 85

Technical Documents

Application Notes

Recommended Soldering Techniques


Additional Technical Documents are available upon request: 
Application information, Evaluation board, and Other technical documents

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