Diodes Incorporated

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Low-Power 8-Output ZDB / Fanout Clock Buffer for PCIe 6.0 and UPI

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The PI6CBE33085 is a low-power PCIe® 1.0/2.0/3.0/ 4.0/5.0/6.0 clock buffer. It takes a reference input to fanout eight 100MHz low-power differential HCSL outputs with on-chip terminations for 85Ω output impedance. It supports both zerodelay and fanout buffer functions for various applications. An individual OE pin for each output provides easier power management.

It uses Diodes proprietary PLL design to achieve very-low jitter that meets PCIe 1.0/2.0/3.0/4.0/5.0/6.0 requirements. Other than PCIe 100MHz support, this device also supports 133.33MHz via a pin.


  • Eight Differential Low-Power HCSL Outputs with On-Chip
  • Termination
  • Default ZOUT = 85Ω
  • Spread Spectrum Tolerant
  • Individual Output Enable
  • Selectable PLL Bandwidths
  • Hardware/SMBus Control of ZDB and Fanout Buffer Modes
  • 1 to 400MHz Fanout Buffer Operation
  • 100MHz and 133.33MHz ZDB Mode
  • Differential Output-to-output Skew <50ps
  • Very Low Jitter Outputs
    • Differential Cycle-to-cycle Jitter <50ps
    • Fanout Buffer Mode Additive Phase Jitter:
      • PCIe 6.0 CC: 0.012 ps
      • DB2000Q Additive Jitter: 0.02ps
    • ZDB Mode Phase Jitter:
      • PCIe 6.0 CC: RMS 0.01 ps
      • QPI/UPI 11.4GB/s: 0.14ps RMS
      • IF-UPI: RMS 0.15 ps
  • 3V Core Supply Voltage
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/104/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/
  • Packaging (Pb-free & Green):
    • 48-TQFN, 6×6mm (ZL)

Product Specifications

Product Parameters

Compliance (Only Automotive(Q) supports PPAP) Standard
Function PCIe clock buffer
Number of Outputs 8
Output Type(s) HCSL
Maximum Output Frequency (MHz) FOB mode up to 400MHz
Additive Jitter (ps) FOB mode 0.0074
Supply Voltage (V) 3.3
Input Type(s) HCSL
Skew (PS) 50
Ambient or Junction Temperature (°C) -40 to 85

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