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STM32H747AI Datasheet(PDF) 139 Page - STMicroelectronics |
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STM32H747AI Datasheet(HTML) 139 Page - STMicroelectronics |
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139 / 252 page  DS12930 Rev 1 129/242 STM32H747xI/G Electrical characteristics 221 6.3.9 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 71: I/O static characteristics. However, the recommended clock input waveform is shown in Figure 21. Figure 21. High-speed external clock source AC timing diagram Table 50. 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 VSW (VHSEH−VHSEL) OSC_IN amplitude 0.7VDD -VDD V VDC OSC_IN input voltage VSS -0.3VSS 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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