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STM32U535NET6QTR Datasheet(PDF) 210 Page - STMicroelectronics |
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STM32U535NET6QTR Datasheet(HTML) 210 Page - STMicroelectronics |
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210 / 278 page ![]() Electrical characteristics STM32U535xx 210/278 DS14217 Rev 1 Figure 35. Output AC characteristics definition 5.3.15 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 32. 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 98. NRST pin characteristics(1) Symbol Parameter Conditions Min Typ Max Unit VIL(NRST) NRST input low-level voltage - - - 0.3 x VDDIOx V VIH(NRST) NRST input high-level voltage - 0.7 x VDDIOx -- Vhys(NRST) NRST Schmitt trigger voltage hysteresis - - 200 - mV RPU Weak pull-up equivalent resistor(2) VIN = VSS 30 40 50 kΩ tF(NRST) NRST input filtered pulse - - - 50 ns tNF(NRST) NRST input not-filtered pulse 1.71 V ≤ VDD ≤ 3.6 V 330 - - 1.58 V ≤ VDD ≤ 3.6 V 1000 - - 1. Specified by design. Not tested in production. 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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