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STM32F446RC 数据表(PDF) 121 Page - STMicroelectronics |
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STM32F446RC 数据表(HTML) 121 Page - STMicroelectronics |
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121 / 202 page  DocID027107 Rev 6 121/202 STM32F446xC/E Electrical characteristics 175 Input/output AC characteristics The definition and values of input/output AC characteristics are given in Figure 32 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 16. Table 57. Output voltage characteristics Symbol Parameter Conditions Min Max Unit VOL(1) 1. The IIO current sunk by the device must always respect the absolute maximum rating specified in Table 14. and the sum of IIO (I/O ports and control pins) must not exceed IVSS. Output low level voltage for an I/O pin CMOS port(2) IIO = +8 mA 2.7 V ≤VDD ≤3.6 V 2. TTL and CMOS outputs are compatible with JEDEC standards JESD36 and JESD52. -0.4 V VOH(3) 3. The IIO current sourced by the device must always respect the absolute maximum rating specified in Table 14 and the sum of IIO (I/O ports and control pins) must not exceed IVDD. Output high level voltage for an I/O pin VDD–0.4 - VOL (1) Output low level voltage for an I/O pin TTL port(2) IIO =+ 8mA 2.7 V ≤VDD ≤3.6 V -0.4 V VOH (3) Output high level voltage for an I/O pin 2.4 - VOL(1) Output low level voltage for an I/O pin IIO = +20 mA 2.7 V ≤VDD ≤3.6 V -1.3(4) 4. Based on characterization data. V VOH(3) Output high level voltage for an I/O pin VDD–1.3(4) - VOL(1) Output low level voltage for an I/O pin IIO = +6 mA 1.8 V ≤VDD ≤3.6 V -0.4(4) V VOH(3) Output high level voltage for an I/O pin VDD–0.4(4) - VOL(1) Output low level voltage for an I/O pin IIO = +4 mA 1.7 V ≤VDD ≤3.6V -0.4(5) 5. Guaranteed by design. V VOH(3) Output high level voltage for an I/O pin VDD–0.4(5) - Table 58. I/O AC characteristics(1)(2) OSPEEDR y[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 |
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