The IDT8T79S828-08I is a high performance, 1-to-8, differential input to universal output clock divider and fanout buffer. The device is designed for frequency-division and signal fanout of high-frequency clock signals in applications requiring four different output frequencies generated simultaneously. Each bank of two outputs has a selectable divider value of ÷1 thru ÷6 and ÷8. The
IDT8T79S828-08I is optimized for 3.3V and 2.5V supply voltages and a temperature range of -40°C to 85°C. The device is packaged in a space-saving 32 lead VFQFN package.

Features

  • Four banks of two low skew outputs
  • Selectable bank output divider values: ÷1 through ÷6 and ÷8
  • Individual outputs remain enabled while serial loading new device configurations
  • One differential PCLK, nPCLK input 
  • PCLK, nPCLK input pair can accept the following differential input levels: LVPECL, LVDS or CML levels 
  • Maximum input frequency: 1.5GHz 
  • LVCMOS control inputs
  • QXx ÷1 edge aligned to QXx ÷n edge
  • Individual output divider control via serial interface
  • Individual output enable/disable control via serial interface
  • Individual output type control, LVDS or LVPECL, via serial interface
  • 2.375V to 3.465V supply voltage operation
  • -40°C to 85°C ambient operating temperature
  • Available in lead-free (RoHS 6) package

Product Options

Orderable Part ID Part Status Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Package Buy Sample
8T79S828-08NLGI Active VFQFPN 32 I Yes Tray Package Info
Availability

Buy / Quote
8T79S828-08NLGI8 Active VFQFPN 32 I Yes Reel Package Info
Availability
Buy / Quote

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
IDT8T79S828-08I Datasheet – Datasheet PDF 686 KB
Application Notes & White Papers
AN-828 Termination - LVPECL – Application Note PDF 322 KB
AN-844 Termination - AC Coupling Clock Receivers – Application Note PDF 170 KB
AN-846 Termination - LVDS – Application Note PDF 133 KB
AN-842 Thermal Considerations in Package Design and Selection – Application Note PDF 495 KB
AN-840 Jitter Specifications for Timing Signals – Application Note PDF 442 KB
AN-834 Hot-Swap Recommendations – Application Note PDF 153 KB
AN-835 Differential Input with VCMR being VIH Referenced – Application Note PDF 160 KB
AN-833 Differential Input Self Oscillation Prevention – Application Note PDF 180 KB
AN-836 Differential Input to Accept Single-ended Levels – Application Note PDF 120 KB
AN-827 Application Relevance of Clock Jitter – Application Note PDF 1.15 MB
AN-815 Understanding Jitter Units – Application Note PDF 565 KB
AN-805 Recommended Ferrite Beads – Application Note PDF 121 KB
PCNs & PDNs
PCN# : A1904-01 Add Greatek, Taiwan as an Alternate Assembly Facility – Product Change Notice PDF 983 KB
PCN# : A1611-02 Add JCET China as Alternate Assembly and Change of Material Set at Alternate Assembly Location – Product Change Notice PDF 583 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
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
info: For device-specific or order-specific documentation, submit a support request.

News & Additional Resources

Date
An Insider’s Guide to Finding the Right Timing Device for Your System Dec 18, 2017
Why Fanout Buffers Make More Sense Nov 28, 2017
Time for Performance Oct 11, 2017