LQFP64 datasheet(117/204 Pages) STMICROELECTRONICS

117 / 204 page

DS8626 Rev 9

117/203

STM32F405xx, STM32F407xx

Electrical characteristics

Input/output AC characteristics

The definition and values of input/output AC characteristics are given in Figure 37 and

Table 50, respectively.

Unless otherwise specified, the parameters given in Table 50 are derived from tests

performed under the ambient temperature and VDD supply voltage conditions summarized

in Table 14.

Table 50. 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 > 2.70 V

MHz

CL = 50 pF, VDD > 1.8 V

CL = 10 pF, VDD > 2.70 V

CL = 10 pF, VDD > 1.8 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 = 1.8 V to

3.6 V

100

fmax(IO)out Maximum frequency(3)

CL = 50 pF, VDD > 2.70 V

MHz

CL = 50 pF, VDD > 1.8 V

12.5

CL = 10 pF, VDD > 2.70 V

50(4)

CL = 10 pF, VDD > 1.8 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 >2.7 V

CL = 50 pF, VDD > 1.8 V

CL = 10 pF, VDD > 2.70 V

CL = 10 pF, VDD > 1.8 V

fmax(IO)out Maximum frequency(3)

CL = 40 pF, VDD > 2.70 V

50(4)

MHz

CL = 40 pF, VDD > 1.8 V

CL = 10 pF, VDD > 2.70 V

100(4)

CL = 10 pF, VDD > 1.8 V

50(4)

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 > 2.70 V

CL = 40 pF, VDD > 1.8 V

CL = 10 pF, VDD > 2.70 V

CL = 10 pF, VDD > 1.8 V

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