STM32F427AI datasheet(138/239 Pages) STMICROELECTRONICS

138 / 239 page

Electrical characteristics

STM32F427xx STM32F429xx

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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

fmax(IO)out Maximum frequency(3)

CL = 50 pF, VDD ≥ 2.7 V

MHz

CL = 50 pF, VDD ≥ 1.7 V

CL = 10 pF, VDD ≥ 2.7 V

CL = 10 pF, VDD ≥ 1.8 V

CL = 10 pF, VDD ≥ 1.7 V

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

fmax(IO)out Maximum frequency(3)

CL = 50 pF, VDD≥ 2.7 V

MHz

CL = 50 pF, VDD≥ 1.8 V

12.5

CL = 50 pF, VDD≥ 1.7 V

CL = 10 pF, VDD ≥ 2.7 V

CL = 10 pF, VDD≥ 1.8 V

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

CL = 10 pF, VDD ≥ 2.7 V

CL = 50 pF, VDD ≥ 1.7 V

CL = 10 pF, VDD ≥ 1.7 V

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

CL = 10 pF, VDD ≥ 1.8 V

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

CL = 10 pF, VDD ≥ 2.7 V

CL = 40 pF, VDD ≥ 1.7 V

CL = 10 pF, VDD ≥ 1.7 V

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