STM32F205RFT6 datasheet(108/184 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F20xxx

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DocID15818 Rev 15

Input/output AC characteristics

The definition and values of input/output AC characteristics are given in Figure 39 and

Table 48, respectively.

Unless otherwise specified, the parameters given in Table 48 are derived from tests

performed under the ambient temperature and VDD supply voltage conditions summarized

in Table 14.

Table 47. Output voltage characteristics(1)

1. PC13, PC14, PC15 and PI8 are supplied through the power switch. Since the switch only sinks a limited

amount of current (3 mA), the use of GPIOs PC13 to PC15 and PI8 in output mode is limited: the speed

should not exceed 2 MHz with a maximum load of 30 pF and these I/Os must not be used as a current

source (e.g. to drive an LED).

Symbol

Parameter

Conditions

Min

Max

Unit

VOL(2)

2. The IIO current sunk by the device must always respect the absolute maximum rating specified in Table 12

and the sum of IIO (I/O ports and control pins) must not exceed IVSS.

Output low level voltage for an I/O pin

when 8 pins are sunk at same time

CMOS ports

IIO = +8 mA

2.7 V < VDD < 3.6 V

-0.4

VOH(3)

3. The IIO current sourced by the device must always respect the absolute maximum rating specified in

Table 12 and the sum of IIO (I/O ports and control pins) must not exceed IVDD.

Output high level voltage for an I/O pin

when 8 pins are sourced at same time

VDD–0.4

VOL (2)

Output low level voltage for an I/O pin

when 8 pins are sunk at same time

TTL ports

IIO =+ 8mA

2.7 V < VDD < 3.6 V

-0.4

VOH (3)

Output high level voltage for an I/O pin

when 8 pins are sourced at same time

2.4

VOL(2)(4)

4. Guaranteed by characterization results, not tested in production.

Output low level voltage for an I/O pin

when 8 pins are sunk at same time

IIO = +20 mA

2.7 V < VDD < 3.6 V

-1.3

VOH(3)(4)

Output high level voltage for an I/O pin

when 8 pins are sourced at same time

VDD–1.3

VOL(2)(4)

Output low level voltage for an I/O pin

when 8 pins are sunk at same time

IIO = +6 mA

2 V < VDD < 2.7 V

-0.4

VOH(3)(4)

Output high level voltage for an I/O pin

when 8 pins are sourced at same time

VDD–0.4

Table 48. I/O AC characteristics(1)

OSPEEDRy

[1:0] bit

value(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fmax(IO)out Maximum frequency(2)

CL = 50 pF, VDD > 2.70 V

MHz

CL = 50 pF, VDD > 1.8 V

CL = 10 pF, VDD > 2.70 V

CL = 10 pF, VDD > 1.8 V

tf(IO)out/

tr(IO)out

Output high to low level fall

time and output low to high

level rise time

CL = 50 pF, VDD = 1.8 V to

3.6 V

100

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