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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STM32F427AI датащи(PDF) 138 Page - STMicroelectronics |
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STM32F427AI датащи(HTML) 138 Page - STMicroelectronics |
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138 / 239 page  Electrical characteristics STM32F427xx STM32F429xx 138/238 DocID024030 Rev 9 Input/output AC characteristics The definition and values of input/output AC characteristics are given in Figure 36 and Table 58, respectively. Unless otherwise specified, the parameters given in Table 58 are derived from tests performed under the ambient temperature and VDD supply voltage conditions summarized in Table 17. Table 58. I/O AC characteristics(1)(2) OSPEEDRy [1:0] bit value(1) Symbol Parameter Conditions Min Typ Max Unit 00 fmax(IO)out Maximum frequency(3) CL = 50 pF, VDD ≥ 2.7 V - - 4 MHz CL = 50 pF, VDD ≥ 1.7 V - - 2 CL = 10 pF, VDD ≥ 2.7 V - - 8 CL = 10 pF, VDD ≥ 1.8 V - - 4 CL = 10 pF, VDD ≥ 1.7 V - - 3 tf(IO)out/ tr(IO)out Output high to low level fall time and output low to high level rise time CL = 50 pF, VDD = 1.7 V to 3.6 V -- 100 ns 01 fmax(IO)out Maximum frequency(3) CL = 50 pF, VDD≥ 2.7 V - - 25 MHz CL = 50 pF, VDD≥ 1.8 V - - 12.5 CL = 50 pF, VDD≥ 1.7 V - - 10 CL = 10 pF, VDD ≥ 2.7 V - - 50 CL = 10 pF, VDD≥ 1.8 V - - 20 CL = 10 pF, VDD≥ 1.7 V - - 12.5 tf(IO)out/ tr(IO)out Output high to low level fall time and output low to high level rise time CL = 50 pF, VDD ≥ 2.7 V - - 10 ns CL = 10 pF, VDD ≥ 2.7 V - - 6 CL = 50 pF, VDD ≥ 1.7 V - - 20 CL = 10 pF, VDD ≥ 1.7 V - - 10 10 fmax(IO)out Maximum frequency(3) CL = 40 pF, VDD ≥ 2.7 V - - 50(4) MHz CL = 10 pF, VDD ≥ 2.7 V - - 100(4) CL = 40 pF, VDD ≥ 1.7 V - - 25 CL = 10 pF, VDD ≥ 1.8 V - - 50 CL = 10 pF, VDD ≥ 1.7 V - - 42.5 tf(IO)out/ tr(IO)out Output high to low level fall time and output low to high level rise time CL = 40 pF, VDD ≥2.7 V - - 6 ns CL = 10 pF, VDD ≥ 2.7 V - - 4 CL = 40 pF, VDD ≥ 1.7 V - - 10 CL = 10 pF, VDD ≥ 1.7 V - - 6 |
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