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PI6C557-03AQLE Datasheet(PDF) 3 Page - Pericom Semiconductor Corporation |
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PI6C557-03AQLE Datasheet(HTML) 3 Page - Pericom Semiconductor Corporation |
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3 / 9 page  3 www.pericom.com PI6C557-03AQ Rev A 05/22/14 All trademarks are property of their respective owners. PI6C557-03AQ PCIe 2.0 Clock Generator with 2 HCSL Outputs for Automotive Applications Application Information Decoupling Capacitors Decoupling capacitors of 0.01μF should be connected between each VDD pin and the ground plane and placed as close to the VDD pin as possible. Crystal Use a 25MHz fundamental mode parallel resonant crystal with less than 300PPM of error across temperature. Crystal Capacitors CL = Crystals's load capacitance in pF Crystal Capacitors (pF) = (CL - 8) *2 For example, for a crystal with 16pF load caps, the external ef- fective crystal cap would be 16 pF. (16-8)*2=16. Current Source (IREF) Reference Resistor - RR If board target trace impedance is 50Ω, then RR = 475Ω providing an IREF of 2.32 mA. The output cur- rent (IOH) is 6*IREF. Output Termination The PCI Express differential clock outputs of the PI6C557-03AQ are open source drivers and require an external series resistor and a resistor to ground. These resistor values and their allow- able locations are shown in detail in the PCI Express Layout Guidelines section. The PI6C557-03AQ can be configured for LVDS compatible volt- age levels. See the LVDS Compatible Layout Guidelines section. Output Structures R R=475 6*IREF =2.3mA IREF See Output Termination Sections Ω 14-0076 |
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