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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32F303VB датащи(PDF) 91 Page - STMicroelectronics |
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STM32F303VB датащи(HTML) 91 Page - STMicroelectronics |
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91 / 148 page  DocID023353 Rev 13 91/148 STM32F303xB STM32F303xC Electrical characteristics 124 Figure 23. I/O AC characteristics definition 6.3.15 NRST pin characteristics The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up resistor, RPU (see Table 54). Unless otherwise specified, the parameters given in Table 57 are derived from tests performed under ambient temperature and VDD supply voltage conditions summarized in Table 24. Table 57. NRST pin characteristics Symbol Parameter Conditions Min Typ Max Unit VIL(NRST)(1) NRST Input low level voltage - - - 0.3VDD+ 0.07(1) V VIH(NRST)(1) NRST Input high level voltage - 0.445VDD+ 0.398(1) -- Vhys(NRST) NRST Schmitt trigger voltage hysteresis - - 200 - mV RPU Weak pull-up equivalent resistor(2) VIN = VSS 25 40 55 k Ω VF(NRST)(1) NRST Input filtered pulse - - - 100(1) ns VNF(NRST)(1) NRST Input not filtered pulse - 500(1) -- ns 1. Guaranteed by design. 2. The pull-up is designed with a true resistance in series with a switchable PMOS. This PMOS contribution to the series resistance must be minimum (~10% order) . |
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