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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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STM32F334 Scheda tecnica(PDF) 78 Page - STMicroelectronics |
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STM32F334 Scheda tecnica(HTML) 78 Page - STMicroelectronics |
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78 / 115 page  Electrical characteristics STM32F334x4 STM32F334x6 STM32F334x8 78/115 DocID025409 Rev 5 Figure 22. 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 50). Unless otherwise specified, the parameters given in Table 53 are derived from tests performed under ambient temperature and VDD supply voltage conditions summarized in Table 19. Table 53. 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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