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Very Low Power 1.8V, 8-Output PCIe 4.0 Clock Generator for Automotive Applications

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The PI6CG188Q is an 8-output very-low-power PCIe Gen1/Gen2/Gen3/Gen4 clock generator. It uses 25MHz crystal or CMOS reference as an input to generate the 100MHz low-power differential HCSL outputs with on-chip terminations. The on-chip termination can save 32 external resistors and make layout easier. An additional buffered reference output is provided to serve as a low-noise reference for other circuitry.

The device uses Diodes' proprietary PLL design to achieve very low jitter that meets PCIe Gen1/Gen2/Gen3/Gen4 requirements. It also provides various options, such as different slew rate and amplitude, through strapping pins or SMBUS, so users can configure the device easily for optimized performance for their individual boards. The device also supports selectable spread spectrum options to reduce EMI for Automotive applications.


  • 1.8V Supply Voltage
  • Crystal/CMOS Input: 25MHz
  • Differential Low-Power HCSL Outputs with On-Chip Termination
  • Individual Output Enable
  • Reference CMOS Output
  • Programmable Slew Rate and Output Amplitute for Each Output
  • Differential Outputs Blocked until PLL is Locked
  • Selectable 0%, -0.25%, or -0.5% Spread on Differential Outputs
  • Strapping pins or SMBus for Configuration
  • 3.3V Tolerant SMBus Interface Support
  • Very-Low-Jitter Outputs
    • Differential Cycle-to-Cycle Jitter <50ps
    • Differential Output-to-Output Skew <60ps
    • PCIe Gen1/Gen2/Gen3/ Gen4 Compliant
    • CMOS REFOUT Phase Jitter is < 1.5ps RMS
  • AEC-Q 100 Qualified, Automotive Grade 2 Support
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • Packaging (Pb-free & Green): 48-lead 6mm × 6mm TQFN

Product Specifications

Product Parameters

Function Generator
Compliance(Only Automotive supports PPAP) Automotive
Input Type(s) Crystal, CMOS
Jitter RMS (ps) <0.5
Number of Outputs 8
Output Frequency (MHz) 100
Output Type(s) Low Power HCSL
Skew (PS) 50
Supply Voltage (V) 1.8
Ambient or Junction Temperature (°C) -40 to 105

Technical Documents

Recommended Soldering Techniques


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

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