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AMD Geode™ GX2 Clock Source

The MK1491-09 is a low cost, low jitter, high performance clock synthesizer for AMD’s Geode™ GX2 processor for information appliance applications. Using patented analog Phase-Locked Loop (PLL) techniques, the device accepts a 14.318 MHz crystal input to produce multiple output clocks. It provides selectable PCI local bus clocks, 48 MHz clocks for Super I/O and USB, as well as multiple Reference outputs. The device has a power down mode to reduce power consumption.


  • Packaged in 28-pin (209 mil) SSOP
  • Available in Pb (lead) free annealed package
  • Provides all critical timing for the AMD GX2 companion chip
  • Four selectable PCI clocks
  • Three LPC interface clocks
  • One fixed 66 MHz clock
  • Two reference clocks
  • 48 MHz USB and 48 MHz I/O support
  • Power-down mode
  • Low EMI Enable reduces EMI radiation on PCI clocks, LCLKS, and 66 MHz clock
  • Operating voltage of 3.3 V

Product Specification

Outputs (#)Output TypeOutput Freq Range (MHz)Inputs (#)Input TypeInput Freq (MHz)Output Voltage (V)Output Banks (#)Phase Jitter Typ RMS (ps)
1214.318000 - 66.000000Crystal14.3181803.3

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
MK1491-09FILNActivePYG28SSOP28IYesTubeCheck Availability
MK1491-09FILNTRActivePYG28SSOP28IYesReelCheck Availability
MK1491-09FLNActivePYG28SSOP28CYesTubeCheck Availability
MK1491-09FLNTRActivePYG28SSOP28CYesReelCheck Availability


Technical Documentation

Title Type Format File Size Datesort icon
Datasheets & Errata
mk149109 Datasheet PDF 211 KB May 17, 2010
PCN# : TB1504-01R1 Qty per Reel Standardization for Selective Packages Product Change Notice PDF 95 KB Oct 22, 2015
PCN# : TB1504-01 Qty per Reel Standardization for Selective Packages Product Change Notice PDF 50 KB Jul 21, 2015
PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products Product Change Notice PDF 361 KB Mar 24, 2013
show all (4)
PCN# : A1208-01R1 Gold to Copper Wire Product Change Notice PDF 254 KB Dec 21, 2012

Software & Tools

Title Type Format File Size Datesort icon
mk149_09 Model - IBIS ZIP 25 KB Mar 14, 2006