STM32F415RG datasheet(114/186 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F415xx, STM32F417xx

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DocID022063 Rev 4

Figure 37. I/O AC characteristics definition

5.3.17

NRST pin characteristics

The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up

resistor, RPU (see Table 47).

Unless otherwise specified, the parameters given in Table 50 are derived from tests

performed under the ambient temperature and VDD supply voltage conditions summarized

in Table 14.

Fmax(IO)ou

Maximum frequency(4)

CL = 30 pF, VDD > 2.70 V

100(5)

MHz

CL = 30 pF, VDD > 1.8 V

50(5)

CL = 10 pF, VDD > 2.70 V

200(5)

CL = 10 pF, VDD > 1.8 V

TBD

tf(IO)out

Output high to low level fall

time

CL = 20 pF,

2.4 < VDD < 2.7 V

TBD

CL = 10 pF, VDD > 2.7 V

TBD

tr(IO)out

Output low to high level rise

time

CL = 20 pF,

2.4 < VDD < 2.7 V

TBD

CL = 10 pF, VDD > 2.7 V

TBD

-tEXTIpw

Pulse width of external

signals detected by the EXTI

controller

1. Based on characterization data, not tested in production.

2. The I/O speed is configured using the OSPEEDRy[1:0] bits. Refer to the STM32F20/21xxx reference manual for a

description of the GPIOx_SPEEDR GPIO port output speed register.

3. TBD stands for “to be defined”.

4. The maximum frequency is defined in Figure 37.

5. For maximum frequencies above 50 MHz, the compensation cell should be used.

Table 49. I/O AC characteristics(1)(2)(3) (continued)

OSPEEDRy

[1:0] bit

value(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

ai14131

10%

90%

50%

tr(IO)out

OUTPUT

EXTERNAL

ON 50pF

Maximum frequency is achieved if (tr + tf) ≤ 2/3)T and if the duty cycle is (45-55%)

10%

50%

90%

when loaded by 50pF

tr(IO)out

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