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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32L433CB датащи(PDF) 130 Page - STMicroelectronics |
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STM32L433CB датащи(HTML) 130 Page - STMicroelectronics |
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130 / 225 page  Electrical characteristics STM32L433xx 130/225 DS11449 Rev 5 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 GPIO. The external clock signal has to respect the I/O characteristics in Section 6.3.14. However, the recommended clock input waveform is shown in Figure 22. Figure 22. Low-speed external clock source AC timing diagram Table 55. Low-speed external user clock characteristics(1) Symbol Parameter Conditions Min Typ Max Unit fLSE_ext User external clock source frequency - - 32.768 1000 kHz VLSEH OSC32_IN input pin high level voltage - 0.7 VDDIOx -VDDIOx V VLSEL OSC32_IN input pin low level voltage - VSS -0.3 VDDIOx tw(LSEH) tw(LSEL) OSC32_IN high or low time - 250 - - ns 1. Guaranteed by design. MS19215V2 VLSEH tf(LSE) 90% 10% TLSE t tr(LSE) VLSEL tw(LSEH) tw(LSEL) |
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