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DRA821U4...ALM 数据表(PDF) 134 Page - Texas Instruments |
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DRA821U4...ALM 数据表(HTML) 134 Page - Texas Instruments |
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134 / 252 page  Device WKUP_OSC0_XO WKUP_OSC0_XI C f1 Crystal C f2 J7ES_WKUP_OSC_INT_02 PCB Ground Figure 7-24. WKUP_OSC0 Crystal Implementation The crystal must be in the fundamental mode of operation and parallel resonant. Table 7-20 summarizes the required electrical constraints. Table 7-20. WKUP_OSC0 Crystal Circuit Requirements PARAMETER MIN TYP MAX UNIT Fxtal Crystal Parallel Resonance Frequency 19.2, 20, 24, 25, 26, 27 MHz Fxtal Crystal Frequency Stability and Tolerance Ethernet RGMII and RMII not used ±100 ppm Ethernet RGMII and RMII using derived clock ±50 CL1+PCBXI Capacitance of CL1 + CPCBXI 12 24 pF CL2+PCBXO Capacitance of CL2 + CPCBXO 12 24 pF CL Crystal Load Capacitance 6 12 pF Cshunt Crystal Circuit Shunt Capacitance ESRxtal = 30 Ω 19.2 MHz, 20 MHz, 24 MHz, 25 MHz, 26 MHz, 27 MHz 7 pF ESRxtal = 40 Ω 19.2 MHz, 20 MHz, 24 MHz, 25 MHz, 26 MHz, 27 MHz 5 pF ESRxtal = 50 Ω 19.2 MHz, 20 MHz, 24 MHz, 25 MHz, 26 MHz, 27 MHz 5 pF ESRxtal = 60 Ω 19.2 MHz, 20 MHz, 24 MHz 5 pF ESRxtal = 80 Ω 19.2 MHz, 20 MHz 5 pF 25 MHz 3 pF ESRxtal = 100 Ω 19.2 MHz, 20 MHz 3 pF ESRxtal Crystal Effective Series Resistance 100 Ω When selecting a crystal, the system design must consider temperature and aging characteristics of the crystal based on worst case environment and expected life expectancy of the system. Table 7-21 details the switching characteristics of the oscillator. DRA821U-Q1 SPRSP57D – APRIL 2020 – REVISED DECEMBER 2022 www.ti.com 134 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: DRA821U-Q1 |
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