STM32F372CB datasheet(86/128 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F37x

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Doc ID 022691 Rev 3

Input/output AC characteristics

The definition and values of input/output AC characteristics are given in Figure 21 and

Table 54, respectively.

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

ambient temperature and VDD supply voltage conditions summarized in Table 22.

Table 54.

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)(3)

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)

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

2MHz

tf(IO)out

Output high to low level

fall time

tr(IO)out

Output low to high level

rise time

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 RM0313 reference manual for a description of

GPIO Port configuration register.

The maximum frequency is defined in Figure 21.

Guaranteed by design, not tested in production.

The I/O speed configuration is bypassed in FM+ I/O mode. Refer to the STM32F37xx and STM32F38xx reference manual

RM0313 for a description of FM+ I/O mode configuration

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