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USB4712 датащи(PDF) 33 Page - Microchip Technology |
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USB4712 датащи(HTML) 33 Page - Microchip Technology |
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33 / 43 page ![]() 2018-2021 Microchip Technology Inc. DS00002774G-page 33 USB4712 Note 9-6 This number includes the pad, the bond wire and the lead frame. PCB capacitance is not included in this value. The XTALI/CLK_IN pin, XTALO pin and PCB capacitance values are required to accurately calculate the value of the two external load capacitors. These two external load capacitors determine the accuracy of the 25.000 MHz frequency. 9.7.2 EXTERNAL REFERENCE CLOCK (CLK_IN) When using an external reference clock, the following input clock specifications are suggested: •25 MHz • 50% duty cycle ±10%, ±100 ppm •Jitter < 100 ps RMS |
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