Datasheet

Electrical characteristics STM32F405xx, STM32F407xx
118/202 DocID022152 Rev 8
Figure 37. I/O AC characteristics definition
11
F
max(IO)out
Maximum frequency
(3)
C
L
= 30 pF, V
DD >
2.70 V - - 100
(4)
MHz
C
L
= 30 pF, V
DD >
1.8 V - - 50
(4)
C
L
= 10 pF, V
DD >
2.70 V - - 180
(4)
C
L
= 10 pF, V
DD >
1.8 V - - 100
(4)
t
f(IO)out
/
t
r(IO)out
Output high to low level fall
time and output low to high
level rise time
C
L
= 30 pF, V
DD >
2.70 V - - 4
ns
C
L
= 30 pF, V
DD >
1.8 V - - 6
C
L
= 10 pF, V
DD >
2.70 V - - 2.5
C
L
= 10 pF, V
DD >
1.8 V - - 4
-t
EXTIpw
Pulse width of external signals
detected by the EXTI
controller
10 - - ns
1. Guaranteed by characterization.
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 37.
4. For maximum frequencies above 50 MHz, the compensation cell should be used.
Table 50. I/O AC characteristics
(1)(2)
(continued)
OSPEEDRy
[1:0] bit
value
(1)
Symbol Parameter Conditions Min Typ Max Unit
DLG



W
U,2RXW
287387
(;7(51$/
21&/
0D[LPXPIUHTXHQF\LVDFKLHYHGLIW
U
W
I
7DQGLIWKHGXW\F\FOHLV
ZKHQORDGHGE\&
/VSHFLILHGLQWKHWDEOH³,2$&FKDUDFWHULVWLFV´




7
W
I,2RXW
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