NOTICE - The following device(s) are recommended alternatives:

The 851021 is a 1-to-21 Differential HCSL Fanout Buffer. The 851021 is designed to translate any differential signal levels to differential HCSL output levels. An external reference resistor is used to set the value of the current supplied to an external load/termination resistor. The load resistor value is chosen to equal the value of the characteristic line impedance of 50 ohms. The 851021 is characterized at an operating supply voltage of 3.3V. The differential HCSL outputs, accurate crossover voltage and duty cycle make the 851021 ideal for interfacing to PCI Express® and FBDIMM applications.

Features

  • Twenty-one differential HCSL outputs
  • Translates any differential input signal (LVPECL, LVHSTL, LVDS, HCSL) to HCSL levels without external bias networks
  • Maximum output frequency: 250MHz
  • Output skew: 395ps (maximum)
  • Part-to-part skew: 335ps (maximum)
  • Output drift: 140ps (maximum)
  • VOH: 850mV (maximum)
  • Full 3.3V supply voltage
  • Available in lead-free (RoHS 6) packages
  • 0°C to 70°C ambient operating temperature

Product Options

Orderable Part ID Part Status Pkg. Code Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
851021AYLF Obsolete EDG64P2 TQFP 64 C Yes Tray
Availability
851021AYLFT Obsolete EDG64P2 TQFP 64 C Yes Reel
Availability

Technical Documentation

Title Other Languages Type Format File Size Date
Datasheets & Errata
851021 Datasheet Datasheet PDF 296 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-834 Hot-Swap Recommendations Application Note PDF 67 KB
AN-833 Differential Input Self Oscillation Prevention Application Note PDF 94 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-805 Recommended Ferrite Beads Application Note PDF 38 KB
PCNs & PDNs
PDN# : CQ-17-04(R1) Product Discontinuance Notice Product Discontinuation Notice PDF 606 KB
PDN# : CQ-17-04 Product Discontinuance Notice Product Discontinuation Notice PDF 599 KB
PCN# : A1606-02 Add Greatek Taiwan as Alternate Assembly Product Change Notice PDF 567 KB
PCN# : A1402-02 Alternate Assembly Locations Product Change Notice PDF 34 KB
PCN# : TB1405-01 New Carrier Tape and Quantity per Reel Product Change Notice PDF 788 KB
Other
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
IDT Fanout Buffers Product Overview Product Brief PDF 739 KB
High-Performance, Low-Phase Noise Clocks Buffers product brief Product Brief PDF 378 KB

Software & Tools

Title Other Languages Type Format File Size Date
851021 IBIS Model_RREF_475 Model - IBIS ZIP 8 KB