STM32F051K4 datasheet(73/104 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F051x

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Doc ID 022265 Rev 3

Input/output AC characteristics

The definition and values of input/output AC characteristics are given in Figure 20 and

Table 52, respectively.

Unless otherwise specified, the parameters given are derived from tests performed under

ambient temperature and VDD supply voltage conditions summarized in Table 20.

Table 52.

I/O AC characteristics(1)

OSPEEDRy

[1:0] value(1)

Symbol

Parameter

Conditions

Min

Max

Unit

fmax(IO)out Maximum frequency

(2)

CL = 50 pF, VDD = 2 V to 3.6 V

MHz

tf(IO)out

Output high to low level

fall time

CL = 50 pF, VDD = 2 V to 3.6 V

-125(3)

tr(IO)out

Output low to high level

rise time

-125(3)

fmax(IO)out Maximum frequency

(2)

CL = 50 pF, VDD = 2 V to 3.6 V

MHz

tf(IO)out

Output high to low level

fall time

CL = 50 pF, VDD = 2 V to 3.6 V

-25(3)

tr(IO)out

Output low to high level

rise time

-25(3)

fmax(IO)out Maximum frequency

(2)

CL = 30 pF, VDD = 2.7 V to 3.6 V

MHz

CL = 50 pF, VDD = 2.7 V to 3.6 V

MHz

CL = 50 pF, VDD = 2 V to 2.7 V

MHz

tf(IO)out

Output high to low level

fall time

CL = 30 pF, VDD = 2.7 V to 3.6 V

5(3)

CL = 50 pF, VDD = 2.7 V to 3.6 V

8(3)

CL = 50 pF, VDD = 2 V to 2.7 V

12(3)

tr(IO)out

Output low to high level

rise time

CL = 30 pF, VDD = 2.7 V to 3.6 V

5(3)

CL = 50 pF, VDD = 2.7 V to 3.6 V

8(3)

CL = 50 pF, VDD = 2 V to 2.7 V

12(3)

FM+

configuration

(4)

fmax(IO)out Maximum frequency

(2)

TBD

MHz

tf(IO)out

Output high to low level

fall time

TBD

tr(IO)out

Output low to high level

rise time

TBD

tEXTIpw

Pulse width of external

signals detected by the

EXTI controller

The I/O speed is configured using the OSPEEDRx[1:0] bits. Refer to the RM0091 reference manual for a description of

GPIO Port configuration register.

The maximum frequency is defined in Figure 20.

Guaranteed by design, not tested in production.

The I/O speed configuration is bypassed in FM+ I/O mode. Refer to the STM32F05xxx reference manual RM0091 for a

description of FM+ I/O mode configuration.

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