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STM32L082KB Arkusz danych(PDF) 89 Page - STMicroelectronics |
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STM32L082KB Arkusz danych(HTML) 89 Page - STMicroelectronics |
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89 / 132 page ![]() DS10688 Rev 7 89/132 STM32L082xx Electrical characteristics 109 Figure 23. 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 60). Unless otherwise specified, the parameters given in Table 60 are derived from tests performed under ambient temperature and VDD supply voltage conditions summarized in Table 23. Maximum frequency is achieved with a duty cycle at (45 - 55%) when loaded by the specified capacitance. T 10% 50% 90% 10% 50% 90% r(IO)out t f(IO)out t Table 60. 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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