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STM32F107VC 数据表(PDF) 62 Page - STMicroelectronics |
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STM32F107VC 数据表(HTML) 62 Page - STMicroelectronics |
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62 / 108 page ![]() Electrical characteristics STM32F105xx, STM32F107xx 62/108 DocID15274 Rev 10 Figure 22. 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 36). Unless otherwise specified, the parameters given in Table 39 are derived from tests performed under the ambient temperature and VDD supply voltage conditions summarized in Table 9. ai14131 tr(IO)out 50% 90% T tf(IO)out Maximum frequency is achieved if (t + t ) < (2/3)T and if the duty cycle is (45-55%) when loaded by 50 pF r f EXTERNAL OUTPUT ON 50 pF 10% 50% 90% 10% Table 39. NRST pin characteristics Symbol Parameter Conditions Min Typ Max Unit VIL(NRST)(1) 1. Guaranteed 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% 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 VDD > 2.7 V 300 - - ns |
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