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STM32F411CC Datasheet(PDF) 83 Page - STMicroelectronics |
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STM32F411CC Datasheet(HTML) 83 Page - STMicroelectronics |
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83 / 149 page ![]() DocID026289 Rev 6 83/149 STM32F411xC STM32F411xE Electrical characteristics 123 Figure 22. High-speed external clock source AC timing diagram Low-speed external user clock generated from an external source In bypass mode the LSE oscillator is switched off and the input pin is a standard I/O. The external clock signal has to respect the Table 53. However, the recommended clock input waveform is shown in Figure 23. The characteristics given in Table 36 result from tests performed using an low-speed external clock source, and under ambient temperature and supply voltage conditions summarized in Table 14. Table 36. Low-speed external user clock characteristics Symbol Parameter Conditions Min Typ Max Unit fLSE_ext User External clock source frequency(1) - - 32.768 1000 kHz VLSEH OSC32_IN input pin high level voltage 0.7VDD -VDD V VLSEL OSC32_IN input pin low level voltage VSS -0.3VDD tw(LSEH) tw(LSEL) OSC32_IN high or low time(1) 450 - - ns tr(LSE) tf(LSE) OSC32_IN rise or fall time(1) -- 50 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. |
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