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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) 139 Page - STMicroelectronics |
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STM32F427AI датащи(HTML) 139 Page - STMicroelectronics |
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139 / 240 page  DS9405 Rev 12 139/240 STM32F427xx STM32F429xx Electrical characteristics 197 Input/output AC characteristics The definition and values of input/output AC characteristics are given in Figure 36 and Table 59, respectively. Unless otherwise specified, the parameters given in Table 59 are derived from tests performed under the ambient temperature and VDD supply voltage conditions summarized in Table 17. Table 59. 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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