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Motore di ricerca datesheet componenti elettronici |
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STM32F479AI Scheda tecnica(PDF) 139 Page - STMicroelectronics |
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STM32F479AI Scheda tecnica(HTML) 139 Page - STMicroelectronics |
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139 / 217 page  DocID028010 Rev 3 139/217 STM32F479xx Electrical characteristics 190 5.3.21 NRST pin characteristics The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up resistor, RPU (see Table 58). Unless otherwise specified, the parameters given in Table 61 are derived from tests performed under the ambient temperature and VDD supply voltage conditions summarized in Table 17. Figure 41. Recommended NRST pin protection 1. The reset network protects the device against parasitic resets. 2. The user must ensure that the level on the NRST pin can go below the VIL(NRST) max level specified in Table 61. Otherwise the reset is not taken into account by the device. Table 61. NRST pin characteristics Symbol Parameter Conditions Min Typ Max Unit RPU Weak pull-up equivalent resistor(1) VIN = VSS 30 40 50 k Ω VF(NRST)(2) NRST Input filtered pulse - - - 100 ns VNF(NRST)(2) NRST Input not filtered pulse VDD > 2.7 V 300 - - TNRST_OUT Generated reset pulse duration Internal Reset source 20 - - µs 1. 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) . 2. Guaranteed by design. |
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