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950401 - Block Diagram
950401 - Pinout


AMD-K8™ System Clock Chip

The 950401 is a main clock synthesizer chip for AMD-K8. This provides all clocks required for Clawhammer and Sledgehammer systems. Spread spectrum may be enabled through I2C programming. Spread spectrum typically reduces system EMI by 8dB to 10dB. This simplifies EMI qualification without resorting to board design iterations or costly shielding. The 950401 employs a proprietary closed loop design, which tightly controls the percentage of spreading over process and temperature variations. Serial programming I2C interface allows changing functions, stop clock programming and frequency selection.


  • 2 - Differential pair push-pull CPU clocks @ 3.3V
  • 7 - PCI (Including 1 free running) @3.3V
  • 3 - Selectable HT/PCI 66/33MHz @3.3V
  • 1 - 48MHz, @3.3V fixed.
  • 1 - 24/48MHz @ 3.3V
  • 3 - REF @3.3V, 14.318MHz.
  • Up to 220MHz frequency support
  • Support power management: PCI stop and stop clocks controlled by I2C.
  • Spread spectrum for EMI reduction
  • Uses external 14.318MHz crystal
  • I2C programmability features
  • Supports Hypes transport technology (HT66 output).

Product Specification

Outputs (#)Output TypeOutput Freq Range (MHz)Input Freq (MHz)Output Banks (#)Core Voltage (V)Output Voltage (V)Chipset ManufacturerChipset Name
14.318000 - 200.00000014.31800073.33.3AMD

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. GradePb (Lead) FreeCarrier TypeSample & Buy
950401CFLFTObsoletePVG48SSOP48CYesReelCheck Availability


Technical Documentation

Title Type Format File Size Datesort icon
Datasheets & Errata
950401 Datasheet Datasheet PDF 111 KB Nov 8, 2006
PCN# : A1506-02 Gold wire to Copper wire Product Change Notice PDF 35 KB Oct 8, 2015
PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products Product Change Notice PDF 361 KB Mar 24, 2013