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STM32L151x8 датащи(PDF) 85 Page - STMicroelectronics |
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STM32L151x8 датащи(HTML) 85 Page - STMicroelectronics |
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85 / 133 page ![]() DocID17659 Rev 12 85/133 STM32L151x6/8/B STM32L152x6/8/B Electrical characteristics 104 Figure 19. I/O AC characteristics definition 6.3.14 NRST pin characteristics The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up resistor, RPU (see Table 45). Unless otherwise specified, the parameters given in Table 45 are derived from tests performed under ambient temperature and VDD supply voltage conditions summarized in Table 13. Table 45. NRST pin characteristics Symbol Parameter Conditions Min Typ Max Unit VIL(NRST)(1) 1. Guaranteed by design. NRST input low level voltage - - - 0.8 V VIH(NRST)(1) NRST input high level voltage - 1.4 - VOL(NRST)(1) NRST output low level voltage IOL = 2 mA 2.7 V < VDD < 3.6 V -- 0.4 IOL = 1.5 mA 1.65 V < VDD < 2.7 V -- Vhys(NRST)(1) NRST Schmitt trigger voltage hysteresis -- 10%VDD(2) 2. 200 mV minimum value mV RPU Weak pull-up equivalent resistor(3) 3. The pull-up is designed with a true resistance in series with a switchable PMOS. This PMOS contribution to the series resistance is around 10%. VIN = VSS 30 45 60 k Ω VF(NRST)(1) NRST input filtered pulse - - - 50 ns VNF(NRST)(1) NRST input not filtered pulse - 350 - ns |
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