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KSZ9563R 数据表(PDF) 211 Page - Microchip Technology |
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KSZ9563R 数据表(HTML) 211 Page - Microchip Technology |
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211 / 226 page  2017-2018 Microchip Technology Inc. DS00002419D-page 211 KSZ9563R 6.5 Clock Specifications A crystal or external clock source, such as an oscillator, is used to provide a 25MHz reference clock for the KSZ9563R. If an external clock source is used, such as the Microchip DSC10xx, the XO pin must be left floating. Figure 6-14 details the available connection methods. Table 6-13 details the recommended crystal specifications. FIGURE 6-14: INPUT REFERENCE CLOCK CONNECTION OPTIONS TABLE 6-13: REFERENCE CRYSTAL CHARACTERISTICS Characteristic Min Typ Max Units Frequency 25 MHz Frequency tolerance ±50 ppm Effective Series Resistance (ESR) 50 Ω Total period jitter (peak-to-peak) 100 ps Drive level 100 uW 25 MHz OSC +/-50ppm No Connect No Connect XI XO XI XO 25 MHz XTAL +/-50ppm Ethernet Switch Ethernet Switch |
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