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STM32F103CBT6XXX Folha de dados(PDF) 66 Page - STMicroelectronics |
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STM32F103CBT6XXX Folha de dados(HTML) 66 Page - STMicroelectronics |
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66 / 116 page ![]() Electrical characteristics STM32F103x8, STM32F103xB 66/116 DS5319 Rev 18 Figure 30. I/O AC characteristics definition 5.3.14 NRST pin characteristics The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up resistor, RPU (see Table 35). Unless otherwise specified, the parameters given in Table 38 are derived from tests performed under the ambient temperature and VDD supply voltage conditions summarized in Table 9. ai14131c 10% 90% 50% tr(IO)out OUTPUT EXTERNAL ON 50pF Maximum frequency is achieved if (tr + tf) ≤ 2/3)T and if the duty cycle is (45-55%) 10% 50% 90% when loaded by 50pF T tf(IO)out Table 38. NRST pin characteristics Symbol Parameter Conditions Min Typ Max Unit VIL(NRST)(1) 1. Specified by design, not tested in production. 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%). VIN VSS 30 40 50 kΩ VF(NRST)(1) NRST Input filtered pulse - - - 100 ns VNF(NRST)(1) NRST Input not filtered pulse - 300 - - ns |
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