STM32F479AI datasheet(135/208 Pages) STMICROELECTRONICS

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STM32F479xx

Electrical characteristics

187

Figure 38. I/O AC characteristics definition

fmax(IO)out Maximum frequency(3)

CL = 30 pF, VDD ≥ 2.7 V

100(4)

MHz

CL = 30 pF, VDD ≥ 1.8 V

CL = 30 pF, VDD ≥ 1.7 V

42.5

CL = 10 pF, VDD≥ 2.7 V

180(4)

CL = 10 pF, VDD ≥ 1.8 V

100

CL = 10 pF, VDD ≥ 1.7 V

72.5

tf(IO)out/

tr(IO)out

Output high to low level fall

time and output low to high

level rise time

CL = 30 pF, VDD ≥ 2.7 V

CL = 30 pF, VDD ≥1.8 V

CL = 30 pF, VDD ≥1.7 V

CL = 10 pF, VDD ≥ 2.7 V

2.5

CL = 10 pF, VDD ≥1.8 V

3.5

CL = 10 pF, VDD ≥1.7 V

tEXTIpw

Pulse width of external signals

detected by the EXTI

controller

-10

1. Guaranteed by design.

2. The I/O speed is configured using the OSPEEDRy[1:0] bits. Refer to the STM32F4xx reference manual for a description of

the GPIOx_SPEEDR GPIO port output speed register.

3. The maximum frequency is defined in Figure 38.

4. For maximum frequencies above 50 MHz and

VDD > 2.4 V, the compensation cell should be used.

Table 60. I/O AC characteristics(1)(2) (continued)

OSPEEDRy

[1:0] bit

value(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

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