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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32H753II датащи(PDF) 123 Page - STMicroelectronics |
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STM32H753II датащи(HTML) 123 Page - STMicroelectronics |
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123 / 361 page  DS12117 Rev 8 123/360 STM32H753xI Electrical characteristics (rev Y) 318 6.3.8 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 I/O. The external clock signal has to respect the Table 59: I/O static characteristics. However, the recommended clock input waveform is shown in Figure 17. Figure 17. High-speed external clock source AC timing diagram Table 41. High-speed external user clock characteristics(1) 1. Guaranteed by design. Symbol Parameter Min Typ Max Unit fHSE_ext User external clock source frequency 4 25 50 MHz VHSEH Digital OSC_IN input high-level voltage 0.7 VDD -VDD V VHSEL Digital OSC_IN input low-level voltage VSS -0.3 VDD tW(HSE) OSC_IN high or low time 7 - - ns ai17528b OSC_IN External STM32 clock source VHSEH tf(HSE) tW(HSE) IL 90 % 10 % THSE t tr(HSE) tW(HSE) fHSE_ext VHSEL |
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