MK1491-09 - Integrated Circuit Systems

MK1491-09 AMD Geode GX2 Clock Source

The MK1491-09 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 clocks, 48 MHz clocks for Super I/O and.

Features

• Packaged in 28-pin SSOP (209 mil body)
• Available in Pb (lead) free packaged
• Provides all critical timing for the AMD Geode companion chip
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• Four selectable PCI clocks Three LPC interface clocks One Fixed 66 MHz clock 2 Reference clocks 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% Block Diagram VDD 6 GND 6 Sel66/33# 4 3 PCI (66/33 MHz) LCLK (33 MHz) 66 MHz Clocks PD# USB Clock 48/TS# 48 MHz REFCLK1 XI 14.31818 MHz crystal Crystal Oscillator REFCLK.