STM32F398VE datasheet(116/151 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F398VE

116/151

DocID027227 Rev 2

Input/output AC characteristics

The definition and values of input/output AC characteristics are given in Figure 34 and

Table 64

, respectively.

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

ambient temperature and VDD supply voltage conditions summarized in Table 18.

Table 64. 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 = 1.65 V to 1.95 V

1(3)

MHz

tf(IO)out

Output high to low level

fall time

CL = 50 pF, VDD = 1.65 V to 1.95 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 = 1.65 V to 1.95 V

4(3)

MHz

tf(IO)out

Output high to low level

fall time

CL = 50 pF, VDD = 1.65 V to 1.95 V

62.5(3)

tr(IO)out

Output low to high level

rise time

-25(3)

fmax(IO)out Maximum frequency(2)

CL = 50 pF, VDD = 1.65 V to 1.95 V

10(3)

MHz

tf(IO)out

Output high to low level

fall time

CL = 50 pF, VDD = 1.65 V to 1.95 V

25(3)

tr(IO)out

Output low to high level

rise time

CL = 50 pF, VDD = 1.65 V to 1.95 V

25(3)

FM+

configuration(4)

fmax(IO)out Maximum frequency(2)

CL = 50 pF, VDD = 1.65 V to 1.95 V

-0.5(3)(4) MHz

tf(IO)out

Output high to low level

fall time

-16(4)

tr(IO)out

Output low to high level

rise time

-44(3)(4)

-tEXTIpw

Pulse width of external

signals detected by the

EXTI controller

-10(3)

-ns

1. The I/O speed is configured using the OSPEEDRx[1:0] bits. Refer to the RM0316 reference manual for a description of

GPIO Port configuration register.

2. The maximum frequency is defined in Figure 34.

3. Guaranteed by design, not tested in production.

4. The I/O speed configuration is bypassed in FM+ I/O mode. Refer to the reference manual RM0316 for a description of FM+

I/O mode configuration.

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