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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 Gen1/Gen2/ Gen3/Gen4/Gen5 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 Gen1/Gen2/Gen3/Gen4/Gen5 requirements. Other than PCIe 100MHz support, this device also support 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.


  • 3.3V 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 Gen1/Gen2/Gen3/Gen4/Gen5 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)
  • Packaging (Pb-free & Green): 32-lead 5×5mm TQFN

Product Specifications

Product Parameters

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

Technical Documents

Application information

SPICE/IBIS Model Documents

Recommended Soldering Techniques



Orderable Part Number Status Package Environmental Compliance Packing Buy from Distributor /
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Qty. Carrier
PI6CB33402ZHIEX Active W-QFN5050-32 TPGP 2500 T&R


Authorized Distributor Quantity Inventory Date Countries/Regions Buy Online
Arrow Electronics 1745 12/3/2022 United States Buy Now
Arrow Electronics Central EU 10000 12/3/2022 Europe Buy Now
Digi-Key Electronics 24687 12/3/2022 Europe, Asia, North America Buy Now
Mouser Electronics Inc. 2495 12/3/2022 South America, North America, Asia, Europe, Middle East Buy Now
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Environmental Compliance Legend:
LFF: Pb-Free Finish and RoHS 5/6
TLFP: Totally Pb-Free Product and RoHS 6/6
LFGP: Pb-free Finish and Green Product, RoHS 5/6 and Halogen Free
TPGP: Totally Pb-Free and Green Product, RoHS 6/6 and Halogen Free
GREEN: Halogen-free and RoHS compliant
RoHS: RoHS compliant but NOT halogen-free

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