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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32F302X8 датащи(PDF) 91 Page - STMicroelectronics |
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STM32F302X8 датащи(HTML) 91 Page - STMicroelectronics |
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91 / 139 page  DS9896 Rev 8 91/139 STM32F302x6 STM32F302x8 Electrical characteristics 117 Figure 23. I/O AC characteristics definition 1. See Table 55: I/O AC characteristics. 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 53). Unless otherwise specified, the parameters given in Table 56 are derived from tests performed under ambient temperature and VDD supply voltage conditions summarized in Table 23. MS34942V1 10% 90% 50% tr(IO)out External output on CL Maximum frequency is achieved if (tr + tf) ≤ 2/3)T and if the duty cycle is (45-55%) 10% 50% 90% when loaded by CL T tf(IO)out (see note 1). Table 56. 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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