Diodes Incorporated
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PCIe 3.0 Clock Generator with 1 HCSL Outputs

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Product Description

The PI6C557-01B is a spread spectrum clock generator compli- ant to PCI Express® 3.0 and Ethernet requirements. The device is used for PC or embedded systems to substantially reduce Electro- magnetic Interference (EMI).

The PI6C557-01B provides one differential (HCSL) or LVDS spread spectrum output. Using Diodes' patented Phase-Locked Loop (PLL) techniques, the device takes a 25MHz crystal input and produces one pair of differential outputs (HCSL) at 100MHz. It also provides spread selection of -0.5% and no spread.


  • PCIe® 3.0 compliant
       - Phase jitter - 0.45ps RMS (High Freq. Typ.) 
  • LVDS compatible output
  • 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% and no spread
  • Industrial temperature range
  • Spread Bypass option available
  • Spread selection via external pins
  • Packaging: (Pb-free and Green)

      - 16-pin TQFN

Product Specifications

Product Parameters

Function Generator
Compliance(Only Automotive supports PPAP) Standard
Input Type(s) Crystal, CMOS
Jitter RMS (ps) <1
Number of Outputs 1
Output Frequency (MHz) 100
Output Type(s) HCSL
Skew (PS) 0
Supply Voltage (V) 3.3
Ambient or Junction Temperature (°C) -40 to 85

Technical 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-2325 – Rev 3 (Interim Update) 2018-04-20 2020-11-20 Fab Porting from Global Foundries to MagnaChip