Diodes Incorporated
W QFN5050 32

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Very Low Power 4-Output PCIe Clock Buffer With On-Chip Termination

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The PI6CB33402 is a 4-output very low power PCIe® Gen 1/Gen 2/Gen 3/Gen 4/Gen 5 clock buffer. It takes a reference input to fanout four 100MHz low power differential HCSL outputs with on-chip terminations. The on-chip termination can save 16 external resistors and make layout easier. Individual OE pin for each output provides easier power management.

It uses Diodes proprietary PLL design to achieve very low jitter that meets PCIe Gen 1/Gen 2/Gen 3/Gen 4/Gen 5 requirements. Other than PCIe 100MHz support, this device also supports Ethernet application with 50MHz, 125MHz and 133.33MHz via SMBus. It provides various options such as different slew rate and amplitude through SMBUS so that users can configure the device easily to get the optimized performance for their individual boards.


  • 3V Supply Voltage
  • HCSL Input: 100MHz, also Support 50MHz, 125MHz or 133.33MHz via SMBus
  • 4 Differential Low Power HCSL Outputs with On-Chip Termination
  • Default ZOUT = 85Ω
  • Spread Spectrum Tolerant
  • Individual Output Enable
  • Programmable Slew Rate and Output Amplitude for each Output
  • Differential Outputs Blocked Until PLL is Locked
  • Strapping Pins or SMBus for Configuration
  • Differential Output-to-Output Skew <50ps
  • Very Low Jitter Outputs
    • Differential Cycle-to-Cycle Jitter <50ps
    • PCIe Gen 1/Gen 2/Gen3 /Gen 4/Gen 5 CC Compliant
    • PCIe Gen 2 and 3 SRiS and SRnS Compliant
  • 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):
    • 32-lead 5×5mm TQFN

Product Specifications

Product Parameters

Compliance (Only Automotive(Q) supports PPAP) Standard
Function Buffer
Number of Outputs 4
Output Type(s) HCSL
Maximum Output Frequency (MHz) 100, 125, 133.33, 156.25
Additive Jitter (ps) 0.05
Supply Voltage (V) 3.3
Input Type(s) HCSL
Skew (PS) 50
Ambient or Junction Temperature (°C) -40 to 85

Technical Documents

Application Information

SPICE/IBIS Model Documents

Recommended Soldering Techniques



Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2520 2021-05-27 2021-08-27 Qualified Additional Bump Site and Assembly/Test (A/T) Sites