MK1491-06

CS5530 Geode ™ Description The MK1491-06 is a low cost, low jitter, high performance clock synthesizer for National Semiconductor CS5530 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 audio clocks, 24 MHz and 48 MHz clocks for Super I/O and USB, as well as multiple Reference outputs. The device has multiple power down modes to reduce power consumption. MK1491-06 Clock Source Features Packaged in 28 pin, 300 mil wide SOIC or in 28 pin, 150 mil wide SSOP Provides all critical timing for the National Semiconductor CS5530 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) 3.3 V ±5% operation Block Diagram VDD 6 GND 5 2 Output Buffers PCI Clocks PCI Frequency Select Low EMI Enable PCIF Function Enable Early PCI Enable SLOW# PCISTP# PWRDWN# 3 PCI Output Buffer EPCI/PCI Audio Select Audio Clock Fixed Clocks Output Buffer Output Buffer Output Buffer Output Buffers 3 16.934 MHz or 24.576 MHz or 49.152 MHz 48 MHz 14.318 MHz or 24 MHz 14.3M/24M Select XI 14.31818 MHz crystal XO Crystal Oscillator MUX 14.318 MHz MDS 1491-06 F 1 Revision 101700 Pr...