STM32F091 datasheet(83/127 Pages) STMICROELECTRONICS

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STM32F091xB STM32F091xC

Electrical characteristics

Input/output AC characteristics

The definition and values of input/output AC characteristics are given in Figure 24 and

Table 55, respectively. Unless otherwise specified, the parameters given are derived from

tests performed under the ambient temperature and supply voltage conditions summarized

in Table 24: General operating conditions.

Table 55. I/O AC characteristics(1)(2)

OSPEEDRy

[1:0] value(1)

Symbol

Parameter

Conditions

Min

Max

Unit

fmax(IO)out Maximum frequency(3)

CL = 50 pF, VDDIOx

≥ 2 V

-2

MHz

tf(IO)out

Output fall time

125

tr(IO)out

Output rise time

125

fmax(IO)out Maximum frequency(3)

CL = 50 pF, VDDIOx

< 2 V

-1

MHz

tf(IO)out

Output fall time

125

tr(IO)out

Output rise time

125

fmax(IO)out Maximum frequency(3)

CL = 50 pF, VDDIOx

≥ 2 V

-10

MHz

tf(IO)out

Output fall time

tr(IO)out

Output rise time

fmax(IO)out Maximum frequency(3)

CL = 50 pF, VDDIOx

< 2 V

-4

MHz

tf(IO)out

Output fall time

62.5

tr(IO)out

Output rise time

62.5

fmax(IO)out Maximum frequency(3)

CL = 30 pF, VDDIOx

≥ 2.7 V

MHz

CL = 50 pF, VDDIOx

≥ 2.7 V

CL = 50 pF, 2 V

≤VDDIOx < 2.7 V

CL = 50 pF, VDDIOx

< 2 V

tf(IO)out

Output fall time

CL = 30 pF, VDDIOx

≥ 2.7 V

CL = 50 pF, VDDIOx

≥ 2.7 V

CL = 50 pF, 2 V

≤VDDIOx < 2.7 V

CL = 50 pF, VDDIOx

< 2 V

tr(IO)out

Output rise time

CL = 30 pF, VDDIOx

≥ 2.7 V

CL = 50 pF, VDDIOx

≥ 2.7 V

CL = 50 pF, 2 V

≤VDDIOx < 2.7 V

CL = 50 pF, VDDIOx

< 2 V

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