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




Type Title Date
Datasheet PDF 271 KB
End Of Life Notice PDF 859 KB
Product Change Notice PDF 95 KB
Product Change Notice PDF 50 KB
Product Change Notice PDF 361 KB
Product Change Notice PDF 254 KB
6 items

Design & Development