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AM6548ACD 数据表(PDF) 156 Page - Texas Instruments |
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AM6548ACD 数据表(HTML) 156 Page - Texas Instruments |
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156 / 284 page  Table 7-17. WKUP_OSC0 Input Clock Timing Requirements (continued) NAME DESCRIPTION MIN TYP MAX UNIT CK1 tw(WKUP_OSC0_XI) Pulse duration, WKUP_OSC0_XI low or high 0.45 × tc(WKUP_OSC0_XI) 0.55 × tc(WKUP_OSC0_XI) ns tj(WKUP_OSC0_XI) Period jitter, WKUP_OSC0_XI 0.01 × tc(WKUP_OSC0_XI) ns tR(WKUP_OSC0_XI) Rise time, WKUP_OSC0_XI 5 ns tF(WKUP_OSC0_XI) Fall time, WKUP_OSC0_XI 5 ns tj(WKUP_OSC0_XI) Frequency accuracy, WKUP_OSC0_XI Ethernet RGMII and RMII not used ±100 ppm Ethernet RGMII and RMII using derived clock ±50 WKUP_OSC0_XI CK0 CK1 CK1 Figure 7-18. WKUP_OSC0_XI Input Clock 7.9.4.1.3 Auxiliary OSC1 Internal Oscillator Clock Source Figure 7-19 shows the recommended crystal circuit. It is recommended that preproduction printed-circuit board (PCB) designs include the two optional resistors Rbias and Rd in case they are required for proper oscillator operation when combined with production crystal circuit components. In most cases, Rbias is not required and Rd is a 0-Ω resistor. These resistors may be removed from production PCB designs after evaluating oscillator performance with production crystal circuit components installed on preproduction PCBs. Device OSC1_XO OSC1_XI C f1 Crystal Rd C f2 (Optional) SPRSP08_PCB_CLK_OSC_1 Rbias (Optional) PCB Ground Figure 7-19. OSC1 Crystal Implementation Note The load capacitors, Cf1 and Cf2 in Figure 7-20, should be chosen such that the below equation is satisfied. CL in the equation is the load specified by the crystal manufacturer. All discrete components used to implement the oscillator circuit should be placed as close as possible to the associated oscillator OSC1_XI, OSC1_XO, and VSS pins. AM6548, AM6528, AM6546, AM6526 SPRSP52B – DECEMBER 2019 – REVISED JUNE 2021 www.ti.com 156 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: AM6548 AM6528 AM6546 AM6526 |
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