STM32F042F4 datasheet(76/117 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F042x4 STM32F042x6

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DocID025832 Rev 5

Input/output AC characteristics

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

Table 52

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

tests performed under the ambient temperature and supply voltage conditions summarized

in Table 21: General operating conditions.

Table 52. 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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