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8T49N012I

FemtoClock® NG Crystal-to-3.3V, 2.5V LVPECL/LVCMOS Clock Generator with Fanout Buffer

The 8T49N012 is a high performance Clock Generator with selectable LVPECL or Single-ended outputs. The 8T49N012 can generate selectable frequencies from a crystal or a single-ended reference clock. The frequency is selected from the Frequency Selection Table.
 
Excellent phase noise performance is maintained with IDT’s Fourth Generation FemtoClock® NG PLL technology.

Features

  • Fourth Generation FemtoClock NG PLL technology
  • Three differential output banks:
    Bank A: selectable between four pairs of LVPECL or four pairs
                  of complementary LVCMOS/LVTTL outputs
    Bank B: two pairs of LVPECL outputs
    Bank C: six pairs of LVPECL outputs
  • Selectable clock input or crystal input.
  • Supports 25MHz fundamental crystal or 25MHz, 50MHz,
    66.67MHz clock input
  • Selectable 156.25MHz, 125MHz, 100MHz clock for Bank B and
    Bank C outputs
  • Selectable 156.25MHz, 125MHz, 100MHz, 250MHz, 312.5MHz,
    50MHz, 25MHz, 62.5MHz or 78.125MHz for Bank A outputs
  • PLL lock indication (LVCMOS output)
  • RMS phase jitter at 156.25MHz (12kHz - 20MHz): 0.199ps (typical)
  • Power supply modes:
    Core / Output
    3.3V / 3.3V
    3.3V / 2.5V
    2.5V / 2.5V
  • -40°C to 85°C ambient operating temperature
  • 56-Lead VFQFN
  • Lead-free (RoHS 6) packaging

Product Specification

Phase Jitter Typ RMS (ps)Inputs (#)Input TypeInput Freq (MHz)Outputs (#)Output TypeOutput Voltage (V)Output Freq Range (MHz)
0.1902LVPECL, LVDS, HCSL, Crystal10.000000 - 312.50000012CMOS, LVPECL2.5, 3.315.160000 - 1250.000000

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
8T49N012NLGIActiveNLG56VFQFPN56IYesTrayCheck Availability
8T49N012NLGI8ActiveNLG56VFQFPN56IYesReelCheck Availability

Documents

Technical Documentation

Title Type Format File Size Datesort icon
Datasheets & Errata
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8t49N012 Datasheet Datasheet PDF 649 KB Nov 26, 2014
User Guides & Manuals
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Programmable FemtoClock Ordering Product Information Manual PDF 140 KB Oct 10, 2014
Apps Notes & White Papers
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AN-828 Termination - LVPECL Application Note PDF 229 KB Jul 5, 2016
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AN-831 The Crystal Load curve Application Note PDF 308 KB Sep 22, 2014
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AN-844 Termination - AC Coupling Clock Receivers Application Note PDF 82 KB May 13, 2014
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AN-846 Termination - LVDS Application Note PDF 50 KB May 13, 2014
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AN-842 Thermal Considerations in Package Design and Selection Application Note PDF 403 KB May 12, 2014
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AN-803 Crystal Timing Budget and Accuracy for IDT Timing Clock Products Application Note PDF 44 KB May 8, 2014
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AN-840 Jitter Specifications for Timing Signals Application Note PDF 349 KB May 8, 2014
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AN-839 RMS Phase Jitter Application Note PDF 149 KB May 7, 2014
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AN-838 Peak-to-Peak Jitter Calculations Application Note PDF 32 KB May 7, 2014
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AN-835 Differential Input with VCMR being VIH Referenced Application Note PDF 77 KB May 6, 2014
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AN-834 Hot-Swap Recommendations Application Note PDF 67 KB May 6, 2014
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AN-836 Differential Input to Accept Single-ended Levels Application Note PDF 37 KB May 6, 2014
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AN-837 Overdriving the Crystal Interface Application Note PDF 50 KB May 6, 2014
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AN-833 Differential Input Self Oscillation Prevention Application Note PDF 94 KB May 6, 2014
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AN-832 Timing Budget and Accuracy Application Note PDF 48 KB May 6, 2014
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AN-830 Quartz Crystal Drive Level Application Note PDF 59 KB May 5, 2014
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AN-827 Application Relevance of Clock Jitter Application Note PDF 1.06 MB Apr 24, 2014
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AN-815 Understanding Jitter Units Application Note PDF 476 KB Apr 24, 2014
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AN-802 Crystal-Measuring Oscillator Negative Resistance Application Note PDF 52 KB Mar 12, 2014
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AN-805 Recommended Ferrite Beads Application Note PDF 38 KB Jan 15, 2014
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AN-806 Power Supply Noise Rejection Application Note PDF 353 KB Jan 15, 2014
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AN-801 Crystal-High Drive Level Application Note PDF 109 KB Jan 15, 2014