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MAX9492
Multiple-Output Clock Generator with Spread Spectrum

Spread-Spectrum Frequency Synthesizer Designed to Generate Multiple Clocks for Clock Distribution in Network Routers or Switches


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 332kB)
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Description
The MAX9492 frequency synthesizer is designed to generate multiple clocks for clock distribution in network routers or switches. The device provides a total of six buffered clock outputs (CLK1 to CLK6). CLK1 is the buffered output of the reference clock. CLK2 through CLK6 are independently programmable to generate eight different frequencies based on a 25MHz input crystal: 133, 125, 83, 66, 62.5, 50, 33, and 25MHz. All the outputs are LVCMOS single-ended signals. Either a 25MHz crystal or an external clock can serve as the input reference clock. The MAX9492 incorporates two phase-locked loops (PLLs) with two internal loop filters.

Select the MAX9492's output clock frequency by programming on-chip registers through the MAX9492's I²C interface. The device also features spread-spectrum capability to reduce electromagnetic interference (EMI). This technique allows spreading the fundamental energy over a wider frequency range, hence reducing the respective energy amplitude. The output frequency spectrum is downspread by -1.25% or -2.5%.

The MAX9492 operates from a 3.3V supply and is guaranteed over the extended temperature range (-40°C to +85°C). The device is available in a space-saving, 20-pin, TQFN, 5mm x 5mm package.

Key Features   Applications/Uses
  • Five LVCMOS Outputs with Independent Frequency Selections
  • One Buffered Reference Clock Output
  • Eight Selectable Frequencies: 133, 125, 83, 66, 62.5, 50, 33, and 25MHz
  • Crystal or an Input-Clock-Based Clock Reference
  • Output Frequency Programmed Through I²C Interface
  • 0, -1.25%, or -2.5% Selectable Downspreading Rate
  • Low Output Period Jitter (Without Spread Spectrum) < 10psRMS
  • < 220ps Output-to-Output Skew
  • Available in 20-Lead, 5mm x 5mm, TQFN Package
  • +3.3V Supply
  • -40°C to +85°C Extended Temperature Range

 
  • Network Hubs, Switches, Routers
  • Storage Area Networks/Network Attached Storage
  • Telecom/Networking Equipment

    Key Specifications:  Clock Generators
    Part Number Applications fIN
    (MHz)
    fIN
    (MHz)
    fOUT
    (MHz)
    fOUT
    (MHz)
    Fixed or Continuous Frequency Output Levels Out-
    puts
    PLLs Program-
    mability
    Spread Spectrum Output Jitter
    (ps)
    VSUPPLY
    (V)
    Package/Pins
    min max min max RMS
    MAX9492 
    Ethernet
    General Purpose
    10 25 25 133.3 Fixed LVCMOS 6 2 I2C Yes 4 3.3
    TQFN/20
    See All Clock Generators (27)

    Diagram
    MAX9492: Typical Operating Circuit
    Typical Operating Circuit

    Application Notes
  • Application Note 3437: Solutions for Integrated Clock Sources Using the MAX9489/MAX9471 Multiple-Output Clock Generators - MAX9492
  • Application Note 3503: Clock Generation with Spread Spectrum - MAX9492

    Reliability Reports
  • Show FIT data for:
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    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-2 of 2

    MAX9492 Free
    Sample
    Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    MAX9492ETP+  
    Active TQFN;20 pin;26 mm²
    Outline Drawing: 21-0140 (PDF)
    Land Pattern: 90-0008 (PDF)
    Use pkgcode/variation: T2055+3*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX9492ETP+T    
    Active

    Land Pattern: Not Available

    -40°C to +85°C See data sheet

    More Information
  • New Product Press Release 2005-05-16 

    Related Products
    MAX9489 Multiple-Output Network Clock Generator

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    Document Ref.: 19-3683; Rev 0; 2005-05-16
    This page last modified: 2007-07-25


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