Clocks & Timing

Overview

The 8T49N008I is an eight output Clock Generator with selectable LVDS or LVPECL outputs. The 8T49N008I can generate any one of four frequencies from a single crystal or reference clock. The four frequencies are selected from the Frequency Selection Table (Table 3) and are programmed via I2C interface. The four predefined frequencies are selected in the user application by two frequency selection pins. Note the desired programmed frequencies must be used with the corresponding crystal as indicated in Table 3. Excellent phase noise performance is maintained with Renesas' 4TH Generation FemtoClock™ NG PLL technology, which delivers sub-0.5ps RMS phase jitter.

8T49N008I Block Diagram
8T49N008I Block Diagram
  • 4TH Generation FemtoClock NG PLL technology
  • Eight selectable LVPECL or LVDS outputs
  • CLK, nCLK input pair can accept the following differential input levels: LVPECL, LVDS, HCSL
  • FemtoClock NG VCO Range: 1.9GHz - 2.55GHz
  • RMS phase jitter at 156.25MHz (10kHz - 1MHz): 0.223ps (typical)
  • Full 2.5V or 3.3V power supply
  • I2C programming interface
  • -40°C to 85°C ambient operating temperature
  • Available in lead-free (RoHS 6) package
  • 4-output (8T49N004I) and 6-output (8T49N006I) also available

Documentation

Title Type Date
8T49N008I Datasheet
PDF1.40 MB
Datasheet
AN-805 Recommended Ferrite Beads
PDF91 KB
Application Note
AN-827 Application Relevance of Clock Jitter
PDF1.99 MB
Application Note
AN-828 Termination - LVPECL
PDF322 KB
Application Note
AN-831 The Crystal Load curve
PDF395 KB
Application Note
AN-844 Termination - AC Coupling Clock Receivers
PDF170 KB
Application Note
AN-846 Termination - LVDS
PDF133 KB
Application Note
AN-842 Thermal Considerations in Package Design and Selection
PDF495 KB
Application Note
AN-840 Jitter Specifications for Timing Signals
PDF442 KB
Application Note
AN-838 Peak-to-Peak Jitter Calculations
PDF115 KB
Application Note
AN-839 RMS Phase Jitter
PDF233 KB
Application Note
AN-832 Timing Budget and Accuracy
PDF131 KB
Application Note
AN-833 Differential Input Self Oscillation Prevention
PDF180 KB
Application Note
AN-834 Hot-Swap Recommendations
PDF153 KB
Application Note
AN-835 Differential Input with VCMR being VIH Referenced
PDF160 KB
Application Note
AN-836 Differential Input to Accept Single-ended Levels
PDF120 KB
Application Note
AN-837 Overdriving the Crystal Interface
PDF133 KB
Application Note
AN-830 Quartz Crystal Drive Level
PDF143 KB
Application Note
AN-815 Understanding Jitter Units
PDF565 KB
Application Note
AN-802 Crystal-Measuring Oscillator Negative Resistance
PDF136 KB
Application Note
AN-801 Crystal-High Drive Level
PDF202 KB
Application Note
AN-806 Power Supply Noise Rejection
PDF438 KB
Application Note
AN-803 Crystal Timing Budget and Accuracy for Renesas Timing Clock Products
PDF108 KB
Application Note
Programmable FemtoClock Ordering Product Information
PDF140 KB
Manual - Hardware
IDT Clock Generation Overview
PDF1.83 MB
Overview
PCN# : 220015 (R1) Add Alternate Assembly Location on VFQFPN Packages
PDF734 KB
Product Change Notice
PCN# : A1904-01 Add Greatek, Taiwan as an Alternate Assembly Facility
PDF983 KB
Product Change Notice
PCN# : A1611-02 Add JCET China as Alternate Assembly and Change of Material Set at Alternate Assembly Location
PDF583 KB
Product Change Notice
PCN# : W1308-01 Change of Passivation Thickness
PDF941 KB
Product Change Notice
IDT Clocks for Xilinx Ultrascale FPGAs
PDF256 KB
Technical Brief
IDT Clocks for Altera's Stratix V and Arria V/X FPGAs
PDF238 KB
Technical Brief

Design & Development

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

Explore ECAD Models
Diagram of ECAD Models

Models

Title Type Date
8T49N008I IBIS Model
ZIP206 KB
Model - IBIS

Product Options

    Processing table
    Pkg. Type
    Lead Count (#)
    Temp. Grade
    Pb (Lead) Free
    Carrier Type
    Buy / Sample
    Part Number
    8T49N008A-000NLGI
    play_circleActive
    memory
    view_in_ar
    Samples Available
    		 VFQFPN 40 I Yes Tray Get Samples,
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