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ics557-03 pdf datasheet(PCI-EX

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The ICS557-03 is a spread spectrum clock generatorsupporTIng PCI-Express and Ethernet requirements.The device is used for PC or embedded systems tosubstanTIally reduce electromagneTIc interference(EMI). The device provides two differenTIal (HCSL)spread spectrum outputs. This device is pin configuredto select spread and clock selection. Using ICS’patented Phase-Locked Loop (PLL) techniques, thedevice takes a 25 MHz crystal input and produces twopairs of differential outputs (HCSL) at 25 MHz, 100MHz, 125 MHz and 200 MHz clock frequencies. It alsoprovides spread selection of ±0.25%, -0.5%, -0.75%,and no spread.
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