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STM32F479AI 数据表(PDF) 115 Page - STMicroelectronics |
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STM32F479AI 数据表(HTML) 115 Page - STMicroelectronics |
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115 / 217 page  DocID028010 Rev 3 115/217 STM32F479xx Electrical characteristics 190 Figure 29. High-speed external clock source AC timing diagram Figure 30. Low-speed external clock source AC timing diagram High-speed external clock generated from a crystal/ceramic resonator The high-speed external (HSE) clock can be supplied with a 4 to 26 MHz crystal/ceramic resonator oscillator. All the information given in this paragraph are based on characterization results obtained with typical external components specified in Table 37. In the application, the resonator and the load capacitors have to be placed as close as possible to the oscillator pins in order to minimize output distortion and startup stabilization Cin(LSE) OSC32_IN input capacitance(1) -- 5 - pF DuCy(LSE) Duty cycle - 30 - 70 % IL OSC32_IN Input leakage current VSS ≤VIN ≤VDD -- ±1 µA 1. Guaranteed by design. Table 36. Low-speed external user clock characteristics (continued) Symbol Parameter Conditions Min Typ Max Unit |
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