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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32L053C6 датащи(PDF) 90 Page - STMicroelectronics |
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STM32L053C6 датащи(HTML) 90 Page - STMicroelectronics |
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90 / 136 page  Electrical characteristics STM32L053x6 STM32L053x8 90/136 DS10152 Rev 9 Figure 24. 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 61). Unless otherwise specified, the parameters given in Table 61 are derived from tests performed under ambient temperature and VDD supply voltage conditions summarized in Table 24. 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 61. 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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