The MK1491-06 is a low-cost, low-jitter, high-performance clock synthesizer for AMD's Geode-based computer and portable 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 and AC97 clocks, 24 MHz and 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 SOIC or in 28-pin SSOP
  • Provides all critical timing for the AMD Geode companion chip
  • Four PCI clocks
  • Selectable PCIF on up to 2 outputs
  • Early PCI clock selectability
  • Up to four reference clocks
  • 48 MHz USB and 24 MHz SIO support
  • AC97 audio clock
  • Multiple power-down modes
  • Low EMI Enable pin reduces EMI radiation on PCI clocks (patented)
  • Operating voltage of 3.3 V ±5%
  • Available in commercial (0 to +70°C) and industrial (-40 to +85°C) temperature ranges

Product Options

Orderable Part ID Part Status Pkg. Code Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
MK1491-06RILF Obsolete PCG28 QSOP 28 I Yes Tube
MK1491-06RILFTR Obsolete PCG28 QSOP 28 I Yes Reel
MK1491-06RLF Obsolete PCG28 QSOP 28 C Yes Tube
MK1491-06RLFTR Obsolete PCG28 QSOP 28 C Yes Reel
MK1491-06SLF Obsolete PSG28 SOIC 28 C Yes Tube
MK1491-06SLFTR Obsolete PSG28 SOIC 28 C Yes Reel

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
MK1491-06 Datasheet Datasheet PDF 180 KB
PCN# : A1509-03 Gold to Copper wire Product Change Notice PDF 31 KB
PDN# : U-14-02 PDN for MK1491 Product Discontinuation Notice PDF 232 KB
PDN# : CQ-14-06R1 Revised Product Discontinuance Notice Product Discontinuation Notice PDF 407 KB
PDN# : CQ-14-06 MANUFACTURING DISCONTINUANCE NOTICE Product Discontinuation Notice PDF 192 KB
PCN# : A1305-01 Gold Wire to Copper Wire Product Change Notice PDF 148 KB
PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products Product Change Notice PDF 361 KB
PCN# : A1208-01R1 Gold to Copper Wire Product Change Notice PDF 254 KB

Boards & Kits