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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32L081CB датащи(PDF) 64 Page - STMicroelectronics |
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STM32L081CB датащи(HTML) 64 Page - STMicroelectronics |
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64 / 110 page  Electrical characteristics STM32L081xx 64/110 DocID027513 Rev 4 6.3.6 External clock source characteristics High-speed external user clock generated from an external source In bypass mode the HSE 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 6.3.12. However, the recommended clock input waveform is shown in Figure 16. Figure 16. High-speed external clock source AC timing diagram Table 37. High-speed external user clock characteristics(1) 1. Guaranteed by design. Symbol Parameter Conditions Min Typ Max Unit fHSE_ext User external clock source frequency CSS is on or PLL is used 18 32 MHz CSS is off, PLL not used 08 32 MHz VHSEH OSC_IN input pin high level voltage - 0.7VDD -VDD V VHSEL OSC_IN input pin low level voltage VSS -0.3VDD tw(HSE) tw(HSE) OSC_IN high or low time 12 - - ns tr(HSE) tf(HSE) OSC_IN rise or fall time - - 20 Cin(HSE) OSC_IN input capacitance - 2.6 - pF DuCy(HSE) Duty cycle 45 - 55 % IL OSC_IN Input leakage current VSS VIN VDD -- ±1 µA |
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