Datasheet

Electrical characteristics STM32F745xx STM32F746xx
116/227 DocID027590 Rev 4
pin circuitry and to charge/discharge the capacitive load (internal or external) connected to
the pin:
where
I
SW
is the current sunk by a switching I/O to charge/discharge the capacitive load
V
DD
is the MCU supply voltage
f
SW
is the I/O switching frequency
C is the total capacitance seen by the I/O pin: C = C
INT
+ C
EXT
The test pin is configured in push-pull output mode and is toggled by software at a fixed
frequency.
I
SW
V
DD
f
SW
C××=
Table 34. Switching output I/O current consumption
(1)
Symbol Parameter Conditions
I/O toggling
frequency (fsw)
MHz
Typ
V
DD
= 3.3 V
Typ
V
DD
= 1.8 V
Unit
I
DDIO
I/O switching
Current
C
EXT
= 0 pF
C = C
INT
+ C
S
+ C
EXT
2 0.1 0.1
mA
8 0.4 0.2
25 1.1 0.7
50 2.4 1.3
60 3.1 1.6
84 4.3 2.4
90 4.9 2.6
100 5.4 2.8
108 5.6 -
C
EXT
= 10 pF
C = C
INT
+ C
S
+ C
EXT
20.20.1
80.60.3
25 1.8 1.1
50 3.1 2.3
60 4.6 3.4
84 9.7 3.6
90 10.12 5.2
100 14.92 5.4
108 18.11 -
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