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

The 854S1208I is a low skew, 8 output LVDS Fanout Buffer with selectable divider. The 854S1208I has 2 selectable inputs that accept a variety of differential input types. The device provides the capability to suppress any glitch at the outputs of the device during an input clock switch to enhance clock redundancy in fault tolerant applications. The divide select inputs, DIV_SELA and DIV_SELB, control the output frequency of each bank. The output banks can be independently selected for ÷1 or ÷2 operation. The output enable pins assigned to each output, support enabling and disabling each output individually. The 854S1208I is characterized at full 3.3V or 2.5V output operating supply modes. Guaranteed output and part-to-part skew characteristics make the 854S1208I ideal for high performance applications.


  • Eight differential LVDS output pairs Each output has individual synchronous output enable
  • Two selectable differential CLKx, nCLKx input pairs
  • CLKx, nCLKx pairs can accept the following differential input levels: LVPECL, LVDS, HCSL
  • Maximum output frequency: 1.5GHz
  • Independent bank control for ÷1 or ÷2 operation
  • Glitchless output behavior during input switch
  • Output skew: 40ps (maximum)
  • Bank skew: 35ps (maximum)
  • Full 3.3V or 2.5V supply mode
  • -40°C to 85°C ambient operating temperature
  • Available in lead-free (RoHS 6) package

Product Options

Part Number Part Status Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
Obsolete PTQFP 48 I Yes Tray
Obsolete PTQFP 48 I Yes Reel


Title language Type Format File Size Date
Datasheets & Errata
854S1208I Datasheet PDF 1.46 MB
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-833 Differential Input Self Oscillation Prevention Application Note PDF 180 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-836 Differential Input to Accept Single-ended Levels Application Note PDF 120 KB
AN-815 Understanding Jitter Units Application Note PDF 565 KB
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.15 MB
AN-805 Recommended Ferrite Beads Application Note PDF 121 KB
PCN# : A1709-02 Add alternate assembly at OSET and Convert to Copper Wire Product Change Notice PDF 35 KB
PCN# : A1309-01 Changed of Traceability Mark Format Product Change Notice PDF 439 KB
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
Clock Distribution Overview 日本語 Overview PDF 217 KB
IDT Clock Generation Overview 日本語 Overview PDF 1.83 MB