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STM32F373VC 数据表(PDF) 89 Page - STMicroelectronics |
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STM32F373VC 数据表(HTML) 89 Page - STMicroelectronics |
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89 / 137 page  DocID022691 Rev 7 89/137 STM32F373xx Electrical characteristics 114 Figure 19. I/O AC characteristics definition 6.3.15 NRST characteristics NRST pin characteristics The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up resistor, RPU (see Table 52). Unless otherwise specified, the parameters given in Table 55 are derived from tests performed under ambient temperature and VDD supply voltage conditions summarized in Table 22. Table 55. 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)(1) 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 ns VNF(NRST)(1) NRST Input not filtered pulse - 500 - - 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 is minimal (~10% order). |
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