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8S58021I - Block Diagram
8S58021I - Pinout


Differential-to-LVPECL/ECL Fanout Buffer

The 8S58021I is a high speed 1-to-4 Differential-to-LVPECL/ECL Fanout Buffer. The 8S58021I is optimized for high speed and very low output skew, making it suitable for use in demanding applications such as SONET, 1 Gigabit and 10 Gigabit Ethernet, and Fibre Channel. The internally terminated differential input and VREF_AC pin allow other differential signal families such as LVDS, LVPECL and CML to be easily interfaced to the input with minimal use of external components. The 8S58021I is packaged in a small 3mm x 3mm 16-pin VFQFN package which makes it ideal for use in space-constrained applications.


  • Four LVPECL/ECL outputs
  • IN, nIN input can accept the following differential input levels: LVPECL, LVDSCML
  • 50Ω internal input termination to VT
  • Output frequency: 2.5GHz (maximum)
  • Output skew: 30ps (maximum)
  • Part-to-part skew: 150ps (maximum)
  • Additive phase jitter, RMS: 0.02ps (typical)
  • Propagation Delay: 425ps (maximum)
  • LVPECL mode operating voltage supply range: VCC = 2.375V to 3.465V, VEE = 0V
  • ECL mode operating voltage supply range: VCC = 0V, VEE = -3.465V to 2.375V
  • -40°C to 85°C ambient operating temperature
  • Available in lead-free (RoHS 6) package

Product Specification

Outputs (#)Output TypeOutput Freq Range (MHz)Input Freq (MHz)Inputs (#)Input TypeOutput Banks (#)Core Voltage (V)Output Voltage (V)Divider ValueOutput Skew (ps)Additive Phase Jitter Typ RMS (ps)
4LVPECL0.000000 - 2500.0000000.000000 - 2500.0000001LVDS, LVPECL, CML12.5, 3.32.5, 3.3300.02

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
8S58021AKILFActiveNLG16VFQFPN16IYesTubeCheck Availability
8S58021AKILFTActiveNLG16VFQFPN16IYesReelCheck Availability


Technical Documentation

Title Other Languages Type Format File Size Datesort icon
Datasheets & Errata
ICS8S58021I Datasheet Datasheet PDF 742 KB Feb 22, 2010
Apps Notes & White Papers
AN-828 Termination - LVPECL Application Note PDF 229 KB Jul 5, 2016
AN-844 Termination - AC Coupling Clock Receivers Application Note PDF 82 KB May 13, 2014
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 403 KB May 12, 2014
show all (11)
AN-840 Jitter Specifications for Timing Signals Application Note PDF 349 KB May 8, 2014
AN-836 Differential Input to Accept Single-ended Levels Application Note PDF 37 KB May 6, 2014
AN-834 Hot-Swap Recommendations Application Note PDF 67 KB May 6, 2014
AN-835 Differential Input with VCMR being VIH Referenced Application Note PDF 77 KB May 6, 2014
AN-833 Differential Input Self Oscillation Prevention Application Note PDF 94 KB May 6, 2014
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.06 MB Apr 24, 2014
AN-815 Understanding Jitter Units Application Note PDF 476 KB Apr 24, 2014
AN-805 Recommended Ferrite Beads Application Note PDF 38 KB Jan 15, 2014
PCN# : A1511-01(R1) Add SPEL India as Alternate Assembly Location Product Change Notice PDF 596 KB Jan 28, 2016
PCN# : A1511-01 Add SPEL India as Alternate Assembly Location Product Change Notice PDF 544 KB Nov 13, 2015
IDT Clock Generation Overview 日本語 Overview PDF 1.83 MB Apr 28, 2016
IDT Clock Distribution Overview 日本語 Overview PDF 3.79 MB Apr 25, 2016