Diodes Incorporated
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PCIe 2.0 Clock Generator with 4 HCSL Outputs for Automotive Applications

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The PI6C557-05Q is a spread spectrum clock generator compliant to PCI Express® 2.0 and Ethernet requirements. The device is used for PC or embedded systems to substantially reduce Electro-magnetic Interference (EMI). The PI6C557-05Q provides four differential (HCSL) or LVDS spread spectrum outputs. The PI6C557-05Q is configured to select spread and clock selection. Using Diodes' patented Phase-Locked Loop (PLL) techniques, the device takes a 25MHz crystal input and produces four pairs of differential outputs (HCSL) at 100MHz and 200MHz clock frequencies. It also pro- vides spread selection of -0.5%, -1.0%, -1.5%, and no spread.


  • PCIe® 2.0 complaint 
    • Phase jitter - 2.1ps RMS (typ)
  • LVDS compatible outputs
  • Supply voltage of 3.3V ±5%
  • 25MHz crystal or clock input frequency
  • HCSL outputs, 0.7V Current mode differential pair
  • Jitter 40ps cycle-to-cycle (typ)
  • Spread of -0.5%, -1.0%, -1.5%, and no spread
  • AEC-Q100 qualified
  • Spread Bypass option available
  • Spread and frequency selection via external pins
  • Packaging: (Pb-free and Green)
    • 20-pin, 173-mil wide TSSOP

Product Specifications

Product Parameters

Compliance (Only Automotive(Q) supports PPAP) Automotive
Supply Voltage (V) 3.3
Jitter RMS (ps) <3
Skew (PS) 50
Output Frequency (MHz) 100
Input Type(s) Crystal, CMOS
Output Type(s) HCSL
Number of Outputs 4
Function Generator
Ambient or Junction Temperature (°C) -40 to 85

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

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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-2322 (Advance Notice) 2018-03-19 2020-03-15 Fab Porting from Global Foundries to MagnaChip