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LAN88730 датащи(PDF) 72 Page - Microchip Technology |
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LAN88730 датащи(HTML) 72 Page - Microchip Technology |
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72 / 82 page ![]() LAN88730 DS60001256B-page 72 2012-2015 Microchip Technology Inc. 3: The total deviation for the Transmitter Clock Frequency is specified by IEEE 802.3u as ±50 ppm. 4: The crystal must support 100 µW operation to utilize this circuit. 5: +85oC for grade A temperature range, +105oC for grade B temperature range 6: This number includes the pad, the bond wire and the lead frame. PCB capacitance is not included in this value. The XTAL1/CLKIN pin, XTAL2 pin and PCB capacitance values are required to accurately calculate the value of the two external load capacitors (C1 and C2 in Figure 5-9). The external load capacitors, C1 and C2, determine the accuracy of the 25.000 MHz frequency. |
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