DATASHEET AMD GEODE GX2 CLOCK SOURCE MK1491-09 Description Features The MK1491-09 is a low-cost, low-jitter, high-performance Packaged in 28-pin SSOP (209 mil body) clock synthesizer for AMDs Geode-based computer and Pb free, RoHS compliant package portable appliance applications. Using patented analog Provides all critical timing for the AMD Geode companion Phased-Locked Loop (PLL) techniques, the device accepts chip a 14.318 MHz crystal input to produce multiple output clocks. It provides selectable PCI local bus clocks, 48 MHz Four selectable PCI clocks clocks for Super I/O and USB, as well as multiple Reference Three LPC interface clocks outputs. One Fixed 66 MHz clock The device has multiple power-down modes to reduce 2 Reference clocks power consumption. 48 MHz USB and 48 MHz IO support Power down mode Low EMI Enable pin reduces EMI radiation on PCI clocks, LCLKS, and 66 MHz clock Operating voltage of 3.3 V 5% Down Spread of 0.5% for PCI, LPC and 66 MHz clocks Industrial and commercial temperature ranges available Block Diagram VDD GND 6 6 4 PCI (66/33 MHz) Sel66/33 Clocks 3 PCI&LPC LCLK or LPC, Clocks (33 MHz) with PD Spread 66 MHz Option USB 48/TS Clock 48 MHz REFCLK1 XI Crystal 14.31818 MHz REFCLK0/Spread Oscillator crystal XO IDT AMD GEODE GX2 CLOCK SOURCE 1 MK1491-09 REV M 051310MK1491-09 AMD GEODE GX2 CLOCK SOURCE CLOCK SYNTHESIZER Pin Assignment GND 1 28 VDD XI 2 27 RefCLK0/Spread XO 3 26 RefCLK1 VDD 4 25 VDD LCLK0/33M 5 24 PCICLK3/33-66M LCLK1/33M 6 23 PCICLK2/33-66M GND 7 22 GND VDD 8 21 GND LCLK2/33M 9 20 PCICLK1/33-66M 10 19 Sel66/33 VDD GND 11 18 PCICLK0/33-66M VDD 12 17 PD 48M 13 16 66M 14 15 48M/TS GND PCI Frequency Select Table Sel66/33 PCI Frequency 033 MHz 166 MHz EMI Control Spread PCI, LPC and Down Spread 66MHz Clocks amount 0ON -0.5% 1OFF 0 Spread direction is DOWN. IDT AMD GEODE GX2 CLOCK SOURCE 2 MK1491-09 REV M 051310