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ICS9250-08 датащи(PDF) 14 Page - Renesas Technology Corp |
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ICS9250-08 датащи(HTML) 14 Page - Renesas Technology Corp |
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14 / 17 page ![]() 14 ICS9250-08 0378J—05/17/05 General Layout Precautions: 1) Use a ground plane on the top layer of the PCB in all areas not used by traces. 2) Make all power traces and ground traces as wide as the via pad for lower inductance. Notes: 1) All clock outputs should have a series terminating resistor, and a 20pF capacitor to ground between the resistor and clock pin. Not shown in all places to improve readibility of diagram. 2) Optional crystal load capacitors are recommended. They should be included in the layout but not inserted unless needed. Component Values: C1 : Crystal load values determined by user C2 : 22µF/20V/D case/Tantalum AVX TAJD226M020R C3 : 100pF ceramic capacitor C4 : 20pF capacitor FB = Fair-Rite products 2512066017X1 All unmarked capacitors are 0.01µF ceramic Connections to VDD: = Routed Power = Ground Connection (component side copper) = Ground Plane Connection = Power Route Connection = Solder Pads = Clock Load Ferrite Bead VDD C2 22µF/20V Tantalum Ferrite Bead VDD C2 22µF/20V Tantalum C3 C3 1 Clock Load 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 2 C1 C1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 3.3V Power Route 3.3V Power Route Ground Ground 2.5V Power Route |
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