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AM652X Scheda tecnica(PDF) 146 Page - Texas Instruments |
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AM652X Scheda tecnica(HTML) 146 Page - Texas Instruments |
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146 / 299 page ![]() OSC1_XI CK0 CK1 CK1 VSS Device OSC1_XO OSC1_XI NC SPRSP08_CLK_01 PCB Ground 146 AM6548, AM6528, AM6546 AM6526, AM6527 SPRSP08E – NOVEMBER 2017 – REVISED OCTOBER 2018 www.ti.com Submit Documentation Feedback Product Folder Links: AM6548 AM6528 AM6546 AM6526 AM6527 Specifications Copyright © 2017–2018, Texas Instruments Incorporated 5.11.4.1.4 Auxiliary OSC1 LVCMOS Digital Clock Source Figure 5-18 shows the recommended oscillator connections when OSC1 is connected to an LVCMOS square-wave digital clock source The 1.8-V LVCMOS-Compatible clock source is connected to the OSC1_XI pin. In this mode of operation, the OSC1_XO pin is left unconnected and should not be used to source any external components. Figure 5-18. 1.8-V LVCMOS-Compatible Clock Input Table 5-22 summarizes the OSC1 input clock electrical characteristics. Table 5-22. OSC1 Switching Characteristics – Crystal Mode NAME DESCRIPTION MIN TYP MAX UNIT f Frequency 19.2, 20, 24, 25, 26, 27 MHz CIN Input capacitance 2.184 2.384 2.584 pF IIN Input current (3.3V mode) 4 6 10 µA Table 5-23 details the OSC1 input clock timing requirements. Table 5-23. OSC1 Input Clock Timing Requirements NAME DESCRIPTION MIN TYP MAX UNIT CK0 1 / tc(OSC1_XI) Frequency, OSC1_XI 19.2, 20, 24, 25, 26, 27 MHz CK1 tw(OSC1_XI) Pulse duration, OSC1_XI low or high 0.45 × tc(OSC1_XI) 0.55 × tc(OSC1_XI) ns tj(OSC1_XI) Period jitter, OSC1_XI 0.01 × tc(OSC1_XI) ns tR(OSC1_XI) Rise time, OSC1_XI 5 ns tF(OSC1_XI) Fall time, OSC1_XI 5 ns tj(OSC1_XI) Frequency accuracy, OSC1_XI Ethernet RGMII and RMII not used ±100 ppm Ethernet RGMII and RMII using derived clock ±50 Figure 5-19. OSC1_XI Input Clock |
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