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STM32L152C6 датащи(PDF) 82 Page - STMicroelectronics |
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STM32L152C6 датащи(HTML) 82 Page - STMicroelectronics |
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82 / 121 page ![]() Electrical characteristics STM32L151x6/8/B, STM32L152x6/8/B 82/121 Doc ID 17659 Rev 8 Figure 18. I/O AC characteristics definition 6.3.13 NRST pin characteristics The NRST pin input driver uses CMOS technology. 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 14. ai14131b 10% 90% 50% tr( IO)out External Output on 50pF Maximum frequency is achieved if (tr + tf) ≤ 2/3)T and if the duty cycle is (45-55%) 10% 50% 90% when loaded by 50 pF T tf(IO)out Table 45. NRST pin characteristics Symbol Parameter Conditions Min Typ Max Unit VIL(NRST) (1) 1. Guaranteed by design, not tested in production. NRST input low level voltage VSS 0.8 V VIH(NRST) (1) NRST input high level voltage 1.4 VDD 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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