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85211I - Block Diagram
85211I - Pinout


Low Skew,1-to-2 Differential-TolvHSTL Fanout Buffer

Alternative Products
NOTICE - The following device(s) are recommended alternatives:
Functionally compatible

The 85211I is a low skew, high performance 1-to-2 Differential-to-LVHSTL Fanout Buffer . The CLK, nCLK pair can accept most standard differential input levels.The 85211I is characterized to operate from a 3.3V power supply. Guaranteed output and part-to-part skew characteristics make the 85211I ideal for those clock d i s t r i b u t i o n a p p l i c a t i o n s d e m a n d i n g w e l l d e f i n e d performance and repeatability. For optimal performance, terminate all outputs.


  • Two differential LVHSTL compatible outputs
  • One differential CLK, nCLK input pair
  • CLK, nCLK pair can accept the following differential input levels: LVDS, LVPECL, LVHSTL, SSTLHCSL
  • Maximum output frequency: 700MHz
  • Translates any single-ended input signal to LVHSTL levels with resistor bias on nCLK input
  • Output skew: 30ps (maximum)
  • Part-to-part skew: 250ps (maximum)
  • Propagation delay: 1ns (maximum)
  • Output duty cycle: 49% - 51% up to 266.6MHz
  • VOH = 1.2V (maximum)
  • 3.3V operating supply
  • -40°C to 85°C ambient operating temperature
  • Available in lead-free RoHS compliant 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)
2HSTL0.000000 - 700.0000000.000000 - 700.0000001HSTL, LVDS, LVPECL, SSTL, HCSL13.33.330

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
85211AMILFObsoleteDCG8SOIC8IYesTubeCheck Availability
85211AMILFTObsoleteDCG8SOIC8IYesReelCheck Availability


Technical Documentation

Title Other Languages Type Format File Size Datesort icon
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-835 Differential Input with VCMR being VIH Referenced Application Note PDF 77 KB May 6, 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-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
PDN# CQ-14-05 MARKET DECLINED PRODUCT DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 192 KB Sep 4, 2014
PCN# : A1309-01 Changed of Traceability Mark Format Product Change Notice PDF 439 KB Oct 11, 2013
PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products Product Change Notice PDF 361 KB Mar 24, 2013
IDT Clock Distribution Overview 日本語 Overview PDF 3.79 MB Apr 25, 2016

Software & Tools

Title Type Format File Size Datesort icon
85211i IBIS Model Model - IBIS ZIP 6 KB Nov 12, 2009