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SL23EP09SC-1 Datasheet(PDF) 10 Page - Silicon Laboratories |
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SL23EP09SC-1 Datasheet(HTML) 10 Page - Silicon Laboratories |
10 / 14 page Rev 2.0, May 12, 2008 Page 10 of 14 SL23EP09 External Components & Design Considerations Typical Application Schematic SL23EP09 CL CL CL 0.1 μF 0.1 μF CLKIN CLKOUT CLKA1 CLKB4 GND GND S1 S2 VDD VDD 1 4 13 9 8 5 12 11 2 16 VDD Comments and Recommendations Decoupling Capacitor: A decoupling capacitor of 0.1μF must be used between VDD and VSS pins. Place the capacitor on the component side of the PCB as close to the VDD pin as possible. The PCB trace to the VDD pin and to the GND via should be kept as short as possible. Do not use vias between the decoupling capacitor and the VDD pin. Series Termination Resistor: A series termination resistor is recommended if the distance between the output clocks and the load is over 1 ½ inch. The nominal impedance of the clock outputs is given on the page 4. Place the series termination resistors as close to the clock outputs as possible. Zero Delay and Skew Control: All outputs and CLKIN pins should be loaded with the same load to achieve “Zero Delay” between the CLKIN and the outputs. The CLKOUT pin is connected to CLKIN internally on-chip for feedback to PLL, and sees an additional 2 pF load with respect to Bank A and B clocks. For applications requiring zero input/output delay, the load at the all output pins including the CLKOUT pin must be the same. If any delay adjustment is required, the capacitance at the CLKOUT pin could be increased or decreased to increase or decrease the delay between Bank A and B clocks and CLKIN. For minimum pin-to-pin skew, the external load at all the Bank A and B clocks must be the same. |
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