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STM32F101XF Fiches technique(PDF) 85 Page - STMicroelectronics |
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STM32F101XF Fiches technique(HTML) 85 Page - STMicroelectronics |
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85 / 117 page ![]() DocID16553 Rev 5 85/117 STM32F101xF, STM32F101xG Electrical characteristics Figure 41. I/O AC characteristics definition 5.3.15 NRST pin characteristics The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up resistor, RPU (see Table 47). Unless otherwise specified, the parameters given in Table 50 are derived from tests performed under ambient temperature and VDD supply voltage conditions summarized in Table 10. Table 50. NRST pin characteristics Symbol Parameter Conditions Min Typ Max Unit VIL(NRST)(1) 1. Guaranteed by design. NRST Input low level voltage - –0.5 - 0.8 V VIH(NRST)(1) NRST Input high level voltage - 2 - VDD+0.5 Vhys(NRST) NRST Schmitt trigger voltage hysteresis - - 200 - mV RPU Weak pull-up equivalent resistor(2) 2. The pull-up is designed with a true resistance in series with a switchable PMOS. This PMOS contribution to the series resistance must be minimum (~10% order) . VIN = VSS 30 40 50 k Ω VF(NRST)(1) NRST Input filtered pulse - - - 100 ns VNF(NRST)(1) NRST Input not filtered pulse - 300 - - ns |
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