Overview

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 (0.025MHz to 0.312MHz step granularity), and spread spectrum clocking that meets the ever-growing demands of Freescale’s next-generation processors.

840NT4 - Block Diagram
840NT4 - Block Diagram
  • 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 to 200MHz
  • Serial interface: I2C programmable
  • Frequency margining in < 0.312MHz steps
  • Spread spectrum for EMI reduction
  • VCO range: 2GHz to 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

Documentation

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.

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Product Options

    Processing table
    Pkg. Type
    Lead Count (#)
    Temp. Grade
    Pb (Lead) Free
    Carrier Type
    Buy / Sample
    Part Number
    840NT4-01NLGI8
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    840NT4NLGI
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    		VFQFPN 48 I Yes Tray
    840NT4NLGI8
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    view_in_ar
    		VFQFPN 48 I Yes Reel
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