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STM32F303RE 数据表(PDF) 123 Page - STMicroelectronics |
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STM32F303RE 数据表(HTML) 123 Page - STMicroelectronics |
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123 / 173 page ![]() DocID026415 Rev 5 123/173 STM32F303xD STM32F303xE Electrical characteristics 151 Figure 40. I/O AC characteristics definition 1. See Table 68: I/O AC characteristics. 6.3.16 NRST pin characteristics The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up resistor, RPU (see Table 66). Unless otherwise specified, the parameters given in Table 69 are derived from tests performed under ambient temperature and VDD supply voltage conditions summarized in Table 19. Table 69. 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, not tested in production. 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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