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STM32F401CDU6 数据表(PDF) 77 Page - STMicroelectronics |
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STM32F401CDU6 数据表(HTML) 77 Page - STMicroelectronics |
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77 / 135 page  DocID025644 Rev 3 77/135 STM32F401xD STM32F401xE Electrical characteristics 114 Figure 22. High-speed external clock source AC timing diagram 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(LSE) tf(LSE) 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, not tested in production. |
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