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840NT4 - Block Diagram

840NT4I

System and DDR Clocks for Freescale B4/T4 Processor Systems

The 840NT4 is a PLL-based clock generator designed to interface with Freescale B4/T4 Processor systems. The clock generator offers low jitter, low-skew clock outputs, frequency margining (0.025 - 0.312MHz step granularity), and spread spectrum clocking that meets the ever-growing demands of Freescale’s next generationprocessors.

Features

  • Ten LVCMOS clock outputs: four system clocks, four DDR clocks, one RTC output, and one 25MHz reference clock
  • Selectable input reference: crystal oscillator interface or differential LVPECL input
  • Output Frequency Range: 25MHz - 200MHz
  • Serial Interface: I2C programmable
  • Frequency Margining in <0.312MHz steps
  • Spread spectrum for EMI reduction
  • VCO range: 2GHz – 2.4GHz
  • Voltage supply modes:
    Core (VDD, VDDXTAL, VDDA) all core voltages must be identical
    Output (VDDO_A,VDDO_B, VDDO_C, VDDO_REF0, VDDO_REF1)
    Core / Output
    3.3V / 3.3V
    3.3V / 2.5V
    3.3V / 1.8V
    2.5V / 2.5V
    2.5V / 1.8V
  • Output voltage levels are independently selectable
  • -40°C to 85°C ambient operating temperature
  • Lead-free (RoHS 6) packaging

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
840NT4-01NLGI8ActiveNLG48VFQFPN48IYesReelCheck Availability
840NT4NLGIActiveNLG48VFQFPN48IYesTrayCheck Availability
840NT4NLGI8ActiveNLG48VFQFPN48IYesReelCheck Availability

Documents

Technical Documentation

Title Type Format File Size Datesort icon
Datasheets & Errata
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840NT4I Datasheet Datasheet PDF 601 KB Jun 16, 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
show all (22)
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AN-845 Termination - LVCMOS Application Note PDF 62 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-838 Peak-to-Peak Jitter Calculations Application Note PDF 32 KB May 7, 2014
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AN-839 RMS Phase Jitter Application Note PDF 149 KB May 7, 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-834 Hot-Swap Recommendations Application Note PDF 67 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-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-835 Differential Input with VCMR being VIH Referenced Application Note PDF 77 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-801 Crystal-High Drive Level Application Note PDF 109 KB Jan 15, 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
PCNs & PDNs
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PCN# : W1308-01 Change of Passivation Thickness Product Change Notice PDF 941 KB Sep 11, 2013