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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32L433CB датащи(PDF) 151 Page - STMicroelectronics |
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STM32L433CB датащи(HTML) 151 Page - STMicroelectronics |
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151 / 225 page  DS11449 Rev 5 151/225 STM32L433xx Electrical characteristics 193 Figure 29. I/O AC characteristics definition(1) 1. Refer to Table 72: I/O AC characteristics. 6.3.15 NRST pin characteristics The NRST pin input driver uses the CMOS technology. It is connected to a permanent pull- up resistor, RPU. Unless otherwise specified, the parameters given in the table below are derived from tests performed under the ambient temperature and supply voltage conditions summarized in Table 22: General operating conditions. MS32132V2 T 10% 50% 90% 10% 50% 90% Maximum frequency is achieved if (t + t (≤ 2/3)T and if the duty cycle is (45-55%) when loaded by the specified capacitance. r f r(IO)out t f(IO)out t Table 73. NRST pin characteristics(1) Symbol Parameter Conditions Min Typ Max Unit VIL(NRST) NRST input low level voltage -- - 0.3ₓVDDIOx V VIH(NRST) NRST input high level voltage -0.7ₓVDDIOx -- Vhys(NRST) NRST Schmitt trigger voltage hysteresis -- 200 - mV RPU Weak pull-up equivalent resistor(2) VIN = VSS 25 40 55 kΩ VF(NRST) NRST input filtered pulse -- - 70 ns VNF(NRST) NRST input not filtered pulse 1.71 V ≤ VDD ≤ 3.6 V 350 - - ns 1. Guaranteed by design. 2. The pull-up is designed with a true resistance in series with a switchable PMOS. This PMOS contribution to the series resistance is minimal (~10% order) . |
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