STM32F217VG datasheet(105/175 Pages) STMICROELECTRONICS

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STM32F21xxx

Electrical characteristics

174

Figure 36. I/O AC characteristics definition

fmax(IO)out Maximum frequency(2)

CL = 30 pF, VDD > 2.70 V

100(3)

MHz

CL = 30 pF, VDD > 1.8 V

50(3)

CL = 10 pF, VDD > 2.70 V

180(3)

CL = 10 pF, VDD > 1.8 V

100(3)

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 > 2.70 V

CL = 30 pF, VDD > 1.8 V

CL = 10 pF, VDD > 2.70 V

2.5

CL = 10 pF, VDD > 1.8 V

-tEXTIpw

Pulse width of external

signals detected by the EXTI

controller

1. 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.

2. The maximum frequency is defined in Figure 36.

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

Table 47. I/O AC characteristics(1) (continued)

OSPEEDRy

[1:0] bit

value(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

ai14131c

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

tf(IO)out

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