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PCIe 2.0 Clock Generator with 4 HCSL Outputs

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Product Description

The PI6C557-05 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 Elec- tromagnetic Interference (EMI).

The PI6C557-05 provides four differential (HCSL) or LVDS spread spectrum outputs. The PI6C557-05 is configured to select spread and clock selection. Using Diodes' patented Phase- Locked Loop (PLL) techniques, the device takes a 25MHz crys- tal input and produces four pairs of differential outputs (HCSL) at 100MHz and 200MHz clock frequencies. It also provides 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
  • Industrial temperature range
  • 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

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

Technical Documents

Evaluation Boards and User Guides

Design tool model software

Application information

Recommended Soldering Techniques


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

Request Documents


Orderable Part Number Status Package Environmental Compliance Packing Buy from Distributor /
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Request Samples
Qty. Carrier
PI6C557-05LE Obsolete TSSOP-20 LFGP 74 TUBE
PI6C557-05LEX Active TSSOP-20 TPGP 3000 T&R Contact Sales Request Sample

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-2487 2020-10-07 2021-01-07 Fab Porting from Global Foundries to Magnachip, Assembly & Test Site Transfer, and Datasheet Change
PCN-2325 – Rev 3 (Interim Update) 2018-04-20 2020-11-20 Fab Porting from Global Foundries to MagnaChip