ST STM32F4 Series Application Note page 23

AN4488
OSPEEDR
y[1:0] bit Symbol
(1)
value
f
max(IO)out
10
t /
f(IO)out
t
r(IO)out
f
max(IO)out
11
t /
f(IO)out
t
r(IO)out
- t
EXTIpw
1. Guaranteed by design.
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. To minimize impact of process variations, IO compensation cell can be activated to reduce the overshoot during rise/fall
transitions, for maximum frequencies above 50 MHz and V
Table 4. I/O AC characteristics
Parameter
(3)
Maximum frequency
Output high to low level fall
time and output low to high
level rise time
(3)
Maximum frequency
Output high to low level fall
time and output low to high
level rise time
Pulse width of external
signals detected by the EXTI
controller
AN4488 Rev 7
(1)(2)
(continued)
Conditions
C = 40 pF, V ≥ 2.7 V
L DD
C = 10 pF, V ≥ 2.7 V
L DD
C = 40 pF, V ≥ 1.7 V
L DD
C = 10 pF, V ≥ 1.8 V
L DD
C = 10 pF, V ≥ 1.7 V
L DD
C = 40 pF, V ≥2.7 V
L DD
C = 10 pF, V ≥ 2.7 V
L DD
C = 40 pF, V ≥ 1.7 V
L DD
C = 10 pF, V ≥ 1.7 V
L DD
C = 30 pF, V ≥ 2.7 V
L DD
C = 30 pF, V ≥ 1.8 V
L DD
C = 30 pF, V ≥ 1.7 V
L DD
C = 10 pF, V ≥ 2.7 V
L DD
C = 10 pF, V ≥ 1.8 V
L DD
C = 10 pF, V ≥ 1.7 V
L DD
C = 30 pF, V ≥ 2.7 V
L DD
C = 30 pF, V ≥1.8 V
L DD
C = 30 pF, V ≥1.7 V
L DD
C = 10 pF, V ≥ 2.7 V
L DD
C = 10 pF, V ≥1.8 V
L DD
C = 10 pF, V ≥1.7 V
L DD
-
> 2.4 V.
DD
Package
Min Typ Max Unit
(3)
- - 50
(3)
- - 100
- - 25 MHz
- - 50
- - 42.5
- - 6
- - 4
- - 10
- - 6
(3)
- - 100
- - 50
- - 42.5
MHz
(3)
- - 180
- - 100
- - 72.5
- - 4
- - 6
- - 7
- - 2.5
- - 3.5
- - 4
10 - -
23/50
ns
ns
ns
49