Diodes Incorporated
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PCIe 2.0 Clock Generator with 2 HCSL Outputs for Automotive Applications

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The PI6C557-03AQ 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 PI6C557-03AQ provides two differential (HCSL) or LVDS spread spectrum outputs. The PI6C557-03AQ 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 two pairs of differential outputs (HCSL) at 25MHz, 100MHz,  125MHz and 200MHz clock frequencies. It also provides spread selection of -0.5%, -0.75%, and no spread.


  • PCIe® 2.0 compliant - Phase jitter - 2.1ps RMS (typ)
  • LVDS compatible outputs
  • Supply voltage of 3.3V ±10%
  • 25MHz crystal or clock input frequency
  • HCSL outputs, 0.8V Current mode differential pair
  • Jitter 35ps cycle-to-cycle (typ)
  • Spread of -0.5%, -0.75%, and no spread
  • AEC-Q100 qualified
  • Spread Bypass option available
  • Spread and frequency selection via external pins
  • Packaging: (Pb-free and Green) - 16-pin TSSOP (L16)

Product Specifications

Product Parameters

Compliance (Only Automotive(Q) supports PPAP) Automotive
Supply Voltage (V) 3.3
Additive Jitter (ps) <3
Skew (PS) 50
Maximum Output Frequency (MHz) 100
Input Type(s) Crystal, CMOS
Output Type(s) HCSL
Number of Outputs 2
Function Generator
Ambient or Junction Temperature (°C) -40 to 85

Technical Documents

SPICE/IBIS Model Documents

Recommended Soldering Techniques


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


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