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8521

Obsolete

Low Skew,1-to-9 Differential-to-HSTL Fanout Buffer

Alternative(s) Available
8523 - Low Skew,1-to-4 Differential-to-HSTL Fanout Buffer

Features

  • 9 HSTL outputs
  • Selectable differential CLK, nCLK or LVPECL clock inputs
  • CLK, nCLK pair can accept the following differential input levels: LVPECL, LVDS, HSTL, SSTL, HCSL
  • PCLK, nPCLK supports the following input types: LVPECL, CML, SSTL
  • Maximum output frequency: 500MHz
  • Output skew: 50ps (maximum)
  • Part-to-part skew: 250ps (maximum)
  • Propagation delay: 1.8ns (maximum)
  • VOH = 1.4V (maximum)
  • 3.3V core, 1.8V output operating supply voltages
  • 0°C to 70°C ambient operating temperature
  • Industrial temperature information available upon request
Find Other Products in Clock Distribution
8521 - Block Diagram
8521 - Pinout
8521 - Block Diagram
8521 - Block Diagram
8521 - Pinout

Description

The 8521 is a low skew, 1-to-9 Differential-to-HSTL Fanout Buffer. The 8521 has two selectable clock inputs. The CLK, nCLK pair can accept most standard differential input levels. The PCLK, nPCLK pair can accept LVPECL, CML, or SSTL input levels. The clock enable is internally synchronized to eliminate runt pulses on the outputs during asynchronous assertion/deassertion of the clock enable pin. Guaranteed output skew, part-to-part skew and crossover voltage characteristics make the 8521 ideal for today's most advanced applications, such as IA64 and static RAMs.

Part NumberStatusSamplesStockPackageLead Count (#)Carrier TypeMoisture Sensitivity Level (MSL)Input TypeQty. per Reel (#)Qty. per Carrier (#)Pb (Lead) FreePb Free CategoryTemp. Range (°C)
8521BYLFObsoleteN/AOut of StockTQFP32#Tray3LVPECL, LVDS, HSTL, SSTL, HCSL0250#Yese3 Sn0 to 70°C
8521BYLFTObsoleteN/AOut of StockTQFP32#Reel3LVPECL, LVDS, HSTL, SSTL, HCSL2000#0Yese3 Sn0 to 70°C
8521BYLNObsoleteN/AOut of StockTQFP32#Tray3CML, HCSL, HSTL, LVDS, LVPECL, SSTL0250#Yese3 Sn0 to 70°C
8521BYLNTObsoleteN/AOut of StockTQFP32#Reel3CML, HCSL, HSTL, LVDS, LVPECL, SSTL2000#0Yese3 Sn0 to 70°C
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    Recommended Documents (1)

  1. Datasheet
    8521 Datasheet
    RECOMMENDED
    PDF 336 KB 7WDXRDKU4E7E-5-48274 Jun 21, 2016

    Datasheets (1)

  1. Datasheet
    8521 Datasheet
    RECOMMENDED
    PDF 336 KB 7WDXRDKU4E7E-5-48274 Jun 21, 2016

    Application Notes & White Papers (11)

  1. Application Note
    AN-805 Recommended Ferrite Beads
    PDF 91 KB R31AN0042EU0102 Rev.1.02 Aug 11, 2025
  2. Application Note
    AN-827 Application Relevance of Clock Jitter
    PDF 1.99 MB 7WDXRDKU4E7E-5-57242 Mar 01, 2022
  3. Application Note
    AN-828 Termination - LVPECL
    PDF 322 KB 7WDXRDKU4E7E-5-57262 Jul 06, 2016
  4. Application Note
    AN-844 Termination - AC Coupling Clock Receivers
    PDF 170 KB 7WDXRDKU4E7E-5-57318 May 13, 2014
  5. Application Note
    AN-842 Thermal Considerations in Package Design and Selection
    PDF 495 KB 7WDXRDKU4E7E-5-57312 May 12, 2014
    6. View More (11)

    Product Notices (PCN, EOL, etc) (8)

  1. End Of Life Notice
    PDN# : CQ-16-01 PRODUCT DISCONTINUANCE NOTICE
    PDF 552 KB 7WDXRDKU4E7E-5-60608 May 04, 2016
  2. Product Change Notice
    PCN# : A1602-01(R1) Add Greatek Taiwan as Alternate Assembly
    PDF 611 KB 7WDXRDKU4E7E-5-60321 Apr 14, 2016
  3. Product Change Notice
    PCN# : A1602-01 Add Greatek Taiwan as Alternate Assembly
    PDF 611 KB 7WDXRDKU4E7E-5-59927 Feb 15, 2016
  4. Product Change Notice
    PCN# : TB1504-01R1 Qty per Reel Standardization for Selective Packages
    PDF 95 KB 7WDXRDKU4E7E-5-59609 Oct 22, 2015
  5. Product Change Notice
    PCN# : TB1504-01 Qty per Reel Standardization for Selective Packages
    PDF 50 KB 7WDXRDKU4E7E-5-59245 Jul 21, 2015
    6. View More (8)

    Marketing Collateral (3)

  1. Overview
    Clock Distribution Overview
    PDF 217 KB 7WDXRDKU4E7E-6-10433 Nov 07, 2020
  2. Product Brief
    IDT Fanout Buffers Product Overview
    PDF 739 KB 7WDXRDKU4E7E-6-7820 Feb 17, 2015
  3. Product Brief
    High-Performance, Low-Phase Noise Clocks Buffers product brief
    PDF 378 KB 7WDXRDKU4E7E-6-1169 Aug 14, 2012
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Simulation Models

    Simulation Models (1)

  1. Model - IBIS
    8521 IBIS Model
    ZIP 39 KB 7WDXRDKU4E7E-5-48075 Sep 21, 2010
    Related Files:
    Model - IBIS
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    Hi,   I would like to simulate my GUIX interface on Visual Studio. However I don't find a complete explanation on the way to create from scratch a project on Visual Studio and add dependencies, source files ect. (I'm using Visual Studio Express 2015 v140)We already succeeded to ...

    Jun 27, 2017
  2. GUIX - Simulation with Visual Studio

    Hi,   I would like to simulate my GUIX interface on Visual Studio. However I don't find a complete explanation on the way to create from scratch a project on Visual Studio and add dependencies, source files ect. (I'm using Visual Studio Express 2015 v140)We already succeeded to ...

    Jun 27, 2017
  3. GUIX - Simulation with Visual Studio

    Hi,   I would like to simulate my GUIX interface on Visual Studio. However I don't find a complete explanation on the way to create from scratch a project on Visual Studio and add dependencies, source files ect. (I'm using Visual Studio Express 2015 v140)We already succeeded to ...

    Jun 27, 2017
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