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AM652X データシート(PDF) 149 Page - Texas Instruments |
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AM652X データシート(HTML) 149 Page - Texas Instruments |
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149 / 277 page  149 AM6548, AM6528, AM6546 AM6526, AM6527 www.ti.com SPRSP08I – NOVEMBER 2017 – REVISED DECEMBER 2019 Submit Documentation Feedback Product Folder Links: AM6548 AM6528 AM6546 AM6526 AM6527 Specifications Copyright © 2017–2019, Texas Instruments Incorporated Table 5-20. WKUP_OSC0 Crystal Electrical Characteristics NAME DESCRIPTION MIN TYP MAX UNIT fp Parallel resonance crystal frequency 19.2, 20, 24, 25, 26, 27 MHz Cf1 Cf1 load capacitance for crystal parallel resonance with Cf1 = Cf2 12 24 pF Cf2 Cf2 load capacitance for crystal parallel resonance with Cf1 = Cf2 12 24 pF ESR(Cf1,Cf2) Crystal ESR 100 Ω CO Crystal shunt capacitance ESR = 30 Ω ESR = 40 Ω 19.2 MHz, 20 MHz, 24 MHz, 25 MHz, 26 MHz, 27 MHz 7 pF ESR = 50 Ω 19.2 MHz, 20 MHz 7 pF 24 MHz, 25 MHz, 26 MHz, 27 MHz 5 pF ESR = 60 Ω 19.2 MHz, 20 MHz 7 pF 24 MHz, 25 MHz, 26 MHz, 27 MHz Not Supported - ESR = 80 Ω 19.2 MHz, 20 MHz 5 pF 24 MHz, 25 MHz, 26 MHz, 27 MHz Not Supported - ESR = 100 Ω 19.2 MHz, 20 MHz 3 pF 24 MHz, 25 MHz, 26 MHz, 27 MHz Not Supported - LM Crystal motional inductance for fp = 20 MHz 10.16 mH CM Crystal motional capacitance 3.42 fF fj(WKUP_OSC0_XI) Frequency accuracy, WKUP_OSC0_XI Ethernet RGMII and RMII not used ±100 ppm Ethernet RGMII and RMII using derived clock ±50 When selecting a crystal, the system design must consider the temperature and aging characteristics of a based on the worst case environment and expected life expectancy of the system. Table 5-21 details the switching characteristics of the oscillator and the requirements of the input clock. Table 5-21. WKUP_OSC0 Switching Characteristics – Crystal Mode NAME DESCRIPTION MIN TYP MAX UNIT fp Oscillation frequency 19.2, 20, 24, 25, 26, 27 MHz tsX Start-up time 2(1) ms |
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