MK1491-06 Datasheet

AMD Geode™ Clock Source


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 Phased-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 audio clocks, 24 MHz and 48 MHz clocks for Super I/O and USB, as well as multiple Reference outputs.

• Packaged in 28-pin SOIC or in 28-pin SSOP
• Available in Pb (lead) free
• 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 4 Reference clocks
• 48 MHz USB and 24MHz 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%



Manufacturer information

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