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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32H533CE датащи(PDF) 118 Page - STMicroelectronics |
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STM32H533CE датащи(HTML) 118 Page - STMicroelectronics |
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118 / 231 page  Electrical characteristics STM32H533xx 118/231 DS14539 Rev 1 5.3.7 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 must respect the Table 39 in addition to Table 57. The external clock can be low-swing (analog) or digital. In case of a low-swing analog input clock, the clock squarer must be activated (refer to RM0481). Table 39. High-speed external user clock characteristics(1) Symbol Parameter Conditions Min Typ Max Unit fHSE_ext User external clock source frequency External digital/analog clock 425 50 MHz VHSEH Digital OSC_IN input high-level voltage External digital clock 0.7 VDD -VDD V VHSEL Digital OSC_IN input low-level voltage VSS - 0.3 VDD tw(HSEH)/tw(HSEL) (2) Digital OSC_IN input high or low time External digital clock 7 - - ns Visw(HSEH) (VHSEH -VHSEH)(3) Analog low-swing OSC_IN peak-to-peak amplitude External analog low swing clock 0.2 - 2/3 VDD V DuCyHSE Analog low-swing OSC_IN duty cycle 45 50 55 % tr(HSE)/tf(HSE) Analog low-swing OSC_IN rise and fall times External analog low swing clock, 10% to 90% 0.05 / fHSE_ext - 0.3 / fHSE_ext ns 1. Specified by design - Not tested in production.. 2. The rise and fall times for a digital input signal are not specified, but the VHSEH and VHSEL conditions must be fulfilled anyway. 3. The DC component of the signal must ensure that the signal peaks are located between VDD and VSS. |
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