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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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STM32L072KB Scheda tecnica(PDF) 100 Page - STMicroelectronics |
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STM32L072KB Scheda tecnica(HTML) 100 Page - STMicroelectronics |
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100 / 160 page  Electrical characteristics STM32L072xx 100/160 DS10689 Rev 5 Figure 28. 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 , except when it is internally driven low (see Table 63). Unless otherwise specified, the parameters given in Table 63 are derived from tests performed under ambient temperature and VDD supply voltage conditions summarized in Table 26. ai14131d 10% 90% 50% tr(IO)out OUTPUT EXTERNAL ON CL Maximum frequency is achieved if (tr + tf) ≤ (2/3)T and if the duty cycle is (45-55%) when loaded by CL specified in the table “ I/O AC characteristics”. 10% 50% 90% T tf(IO)out Table 63. NRST pin characteristics Symbol Parameter Conditions Min Typ Max Unit VIL(NRST)(1) 1. Guaranteed by design. 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 25 45 65 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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