STM32F103C8T7 datasheet(67/105 Pages) STMICROELECTRONICS

67 / 105 page

STM32F103x8, STM32F103xB

Electrical characteristics

Doc ID 13587 Rev 15

67/105

Input/output AC characteristics

The definition and values of input/output AC characteristics are given in Figure 30 and

Table 37, respectively.

Unless otherwise specified, the parameters given in Table 37 are derived from tests

performed under the ambient temperature and VDD supply voltage conditions summarized

in Table 9.

Table 37.

I/O AC characteristics(1)

The I/O speed is configured using the MODEx[1:0] bits. Refer to the STM32F10xxx reference manual for a

description of GPIO Port configuration register.

MODEx[1:0]

bit value(1)

Symbol

Parameter

Conditions

Min

Max

Unit

fmax(IO)out Maximum frequency

(2)

The maximum frequency is defined in Figure 30.

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)

Guaranteed by design, not tested in production.

tr(IO)out

Output low to high

level rise time

125(3)

fmax(IO)out Maximum frequency

(2) C

L = 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)

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)

-tEXTIpw

Pulse width of

external signals

detected by the EXTI

controller

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