STM32F051X4 datasheet(74/122 Pages) STMICROELECTRONICS

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Electrical characteristics

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Input/output AC characteristics

The definition and values of input/output AC characteristics are given in Figure 23 and

Table 50

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

tests performed under the ambient temperature and supply voltage conditions summarized

in Table 20: General operating conditions.

Table 50. I/O AC characteristics(1)(2)

1. The I/O speed is configured using the OSPEEDRx[1:0] bits. Refer to the STM32F0xxxx RM0091 reference

manual for a description of GPIO Port configuration register.

2. Guaranteed by design, not tested in production.

OSPEEDRy

[1:0]

value(1)

Symbol

Parameter

Conditions

Min

Max

Unit

fmax(IO)out Maximum frequency(3)

3. The maximum frequency is defined in Figure 23.

CL = 50 pF

-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

-10

MHz

tf(IO)out

Output fall time

tr(IO)out

Output rise time

fmax(IO)out Maximum frequency(3)

CL = 30 pF, VDDIOx ≥ 2.7 V

MHz

CL = 50 pF, VDDIOx ≥ 2.7 V

CL = 50 pF, VDDIOx < 2.7 V

tf(IO)out

Output fall time

CL = 30 pF, VDDIOx ≥ 2.7 V

CL = 50 pF, VDDIOx ≥ 2.7 V

CL = 50 pF, VDDIOx < 2.7 V

tr(IO)out

Output rise time

CL = 30 pF, VDDIOx ≥ 2.7 V

CL = 50 pF, VDDIOx ≥ 2.7 V

CL = 50 pF, VDDIOx < 2.7 V

Fm+

configuration

(4)

4. When Fm+ configuration is set, the I/O speed control is bypassed. Refer to the STM32F0xxxx reference

manual RM0091 for a detailed description of Fm+ I/O configuration.

fmax(IO)out Maximum frequency(3)

CL = 50 pF

-2

MHz

tf(IO)out

Output fall time

tr(IO)out

Output rise time

-tEXTIpw

Pulse width of external

signals detected by

the EXTI controller

-10

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