The 557-05A is a spread-spectrum clock generator that supports PCI-Express requirements. It is used in PC or embedded systems to substantially reduce electro-magnetic interference (EMI). The device provides four differential HCSL or LVDS high-frequency outputs with spread spectrum capability. The output frequency and spread type are selectable using external pins.

Features

  • Packaged in 20-pin TSSOP
  • RoHS 5 (green) or RoHS 6 (green and lead free) complaint package
  • Supports PCI-Express applications
  • Four differential spread spectrum clock outputs
  • Spread spectrum for EMI reduction
  • Uses external 25 MHz clock or crystal input
  • Power down pin turns off chip
  • OE control tri-states outputs
  • Spread and frequency selection via external pins
  • Spread Bypass option available
  • Industrial temperature range available
  • For PCIe Gen2 applications, see the 5V41066
  • For PCIe Gen3 applications, see the 5V41236

Product Options

Orderable Part ID Part Status Pkg. Code Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
557G-05ALF Active PGG20 TSSOP 20 C Yes Tube
Availability
557G-05ALFT Active PGG20 TSSOP 20 C Yes Reel
Availability
557GI-05ALF Active PGG20 TSSOP 20 I Yes Tube
Availability
557GI-05ALFT Active PGG20 TSSOP 20 I Yes Reel
Availability

Technical Documentation

Title Other Languages Type Format File Size Date
Datasheets & Errata
557-05A Datasheet Datasheet PDF 173 KB
Application Notes & White Papers
AN-828 Termination - LVPECL Application Note PDF 229 KB
AN-844 Termination - AC Coupling Clock Receivers Application Note PDF 82 KB
AN-843 PCI Express Reference Clock Requirements Application Note PDF 1.81 MB
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 403 KB
AN-835 Differential Input with VCMR being VIH Referenced Application Note PDF 77 KB
AN-840 Jitter Specifications for Timing Signals Application Note PDF 349 KB
AN-839 RMS Phase Jitter Application Note PDF 149 KB
AN-838 Peak-to-Peak Jitter Calculations Application Note PDF 32 KB
AN-836 Differential Input to Accept Single-ended Levels Application Note PDF 37 KB
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.06 MB
AN-815 Understanding Jitter Units Application Note PDF 476 KB
AN-802 Crystal-Measuring Oscillator Negative Resistance Application Note PDF 52 KB
AN-805 Recommended Ferrite Beads Application Note PDF 38 KB
AN-808 PCI Express/HCSL Termination Application Note PDF 54 KB
PCNs & PDNs
PCN# : A1602-01(R1) Add Greatek Taiwan as Alternate Assembly Product Change Notice PDF 611 KB
PCN# : A1602-01 Add Greatek Taiwan as Alternate Assembly Product Change Notice PDF 611 KB
PCN# : A1511-01(R1) Add SPEL India as Alternate Assembly Location Product Change Notice PDF 596 KB
PCN# : A1511-01 Add SPEL India as Alternate Assembly Location Product Change Notice PDF 544 KB
PCN# : TB1504-01R1 Qty per Reel Standardization for Selective Packages Product Change Notice PDF 95 KB
PCN# : TB1504-01 Qty per Reel Standardization for Selective Packages Product Change Notice PDF 50 KB
PCN# : A1309-01 Changed of Traceability Mark Format Product Change Notice PDF 439 KB
PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products Product Change Notice PDF 361 KB
Other
PCI Express Timing Solutions Overview Overview PDF 275 KB
Timing Solutions Products Overview Overview PDF 4.11 MB
IDT Clock Generation Overview 日本語 Overview PDF 1.83 MB
IDT Clock Distribution Overview 日本語 Overview PDF 3.79 MB

Software & Tools

Title Other Languages Type Format File Size Date
557-05A IBIS Model Model - IBIS ZIP 5 KB