STM32F427AI datasheet(139/240 Pages) STMICROELECTRONICS

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DS9405 Rev 12

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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

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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