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8T49N445I - Block Diagram
8T49N445I - Pinout


FemtoClock NG QUAD Universal Frequency Translator

The IDT8T49N445I is a quad PLL with FemtoClock® NG technology. The IDT8T49N445I integrates low phase noise Frequency Translation / Synthesizer and jitter attenuation. It includes alarm and monitoring functions suitable for networking and communications applications. The device has four fully independent PLLs, each PLL  is able to generate any output frequency in the 0.98MHz - 312.5MHz range and most output frequencies in the 312.5MHz - 1,300MHz range. A wide range of input reference clocks may be used as the source for the output frequency.

Each PLL of IDT8T49N445I has three operating modes to support a very broad spectrum of applications:Frequency Synthesizer, High-Bandwidth Frequency Translator and Low-Bandwidth Frequency Translator


  • Four fully independent PLLs
  • Output is programmable as LVPECL or LVDS
  • Programmable output frequency: 0.98MHz up to 1,300MHz
  • Differential inputs support the following input types: LVPECL, LVDS, LVHSTLHCSL
  • Input frequency range: 8kHz - 710MHz
  • Input clock monitor on each PLL will smoothly switch between redundant input references
  • I2C Serial interface for register programming
  • RMS phase jitte: 465fs (typical), Low Bandwidth Mode (FracN)
  • RMS phase jitter: 333fs (typical), synthesizer Mode (integer FB)
  • Full 2.5V supply mode
  • -40°C to 85°C ambient operating temperature
  • 10mm X 10mm CABGA lead-free (RoHS 6) package
  • Additional Family members include a Dual PLL 8T49N244I, Tri-PLL 8T49N366I and Quad PLL (8T49N488I)

Product Specification

Phase Jitter Typ RMS (ps)Inputs (#)Input TypeInput Freq (MHz)Outputs (#)Output TypeOutput Voltage (V)Output Freq Range (MHz)
0.3335LVDS, LVPECL, LVHSTL, HCSL, LVTTL, LVCMOS0.008000 - 710.0000004LVDS, LVPECL2.50.980000 - 1300.000000

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
8T49N445-000ASGIActiveASG80CABGA80IYesTrayCheck Availability
8T49N445-000ASGI8ActiveASG80CABGA80IYesReelCheck Availability
8T49N445-999ASGIActiveASG80CABGA80IYesTrayCheck Availability
8T49N445-999ASGI8ActiveASG80CABGA80IYesReelCheck Availability


Technical Documentation

Title Type Format File Size Datesort icon
Datasheets & Errata
IDT8T49N445I Datasheet Datasheet PDF 1014 KB Jun 28, 2013
User Guides & Manuals
FemtoNG Universal Frequency Translator Ordering Product Information Guide Manual - User Reference PDF 216 KB Sep 9, 2016
Apps Notes & White Papers
AN-828 Termination - LVPECL Application Note PDF 229 KB Jul 5, 2016
AN-831 The Crystal Load curve Application Note PDF 308 KB Sep 22, 2014
AN-844 Termination - AC Coupling Clock Receivers Application Note PDF 82 KB May 13, 2014
show all (21)
AN-846 Termination - LVDS Application Note PDF 50 KB May 13, 2014
AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 403 KB May 12, 2014
AN-803 Crystal Timing Budget and Accuracy for IDT Timing Clock Products Application Note PDF 44 KB May 8, 2014
AN-840 Jitter Specifications for Timing Signals Application Note PDF 349 KB May 8, 2014
AN-839 RMS Phase Jitter Application Note PDF 149 KB May 7, 2014
AN-838 Peak-to-Peak Jitter Calculations Application Note PDF 32 KB May 7, 2014
AN-832 Timing Budget and Accuracy Application Note PDF 48 KB May 6, 2014
AN-833 Differential Input Self Oscillation Prevention Application Note PDF 94 KB May 6, 2014
AN-835 Differential Input with VCMR being VIH Referenced Application Note PDF 77 KB May 6, 2014
AN-834 Hot-Swap Recommendations Application Note PDF 67 KB May 6, 2014
AN-836 Differential Input to Accept Single-ended Levels Application Note PDF 37 KB May 6, 2014
AN-830 Quartz Crystal Drive Level Application Note PDF 59 KB May 5, 2014
AN-815 Understanding Jitter Units Application Note PDF 476 KB Apr 24, 2014
AN-827 Application Relevance of Clock Jitter Application Note PDF 1.06 MB Apr 24, 2014
AN-802 Crystal-Measuring Oscillator Negative Resistance Application Note PDF 52 KB Mar 12, 2014
AN-801 Crystal-High Drive Level Application Note PDF 109 KB Jan 15, 2014
AN-806 Power Supply Noise Rejection Application Note PDF 353 KB Jan 15, 2014
AN-805 Recommended Ferrite Beads Application Note PDF 38 KB Jan 15, 2014
PCN# : W1308-01 Change of Passivation Thickness Product Change Notice PDF 941 KB Sep 11, 2013