STM32F407VEH6 Ver la hoja de datos (PDF) - STMicroelectronics
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STM32F407VEH6 Datasheet PDF : 185 Pages
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STM32F405xx, STM32F407xx
Electrical characteristics
Table 49. I/O AC characteristics(1)(2)(3) (continued)
OSPEEDRy
[1:0] bit
value(1)
Symbol
Parameter
Conditions
Min Typ Max Unit
Fmax(IO)ou Maximum frequency(4)
t
CL = 30 pF, VDD > 2.70 V
CL = 30 pF, VDD > 1.8 V
CL = 10 pF, VDD > 2.70 V
-
- 100(5)
-
-
50(5)
-
-
200(5) MHz
CL = 10 pF, VDD > 1.8 V
-
- TBD
11
tf(IO)out
Output high to low level fall
time
CL = 20 pF,
2.4 < VDD < 2.7 V
-
- TBD
CL = 10 pF, VDD > 2.7 V
-
- TBD
ns
tr(IO)out
Output low to high level rise
time
CL = 20 pF,
2.4 < VDD < 2.7 V
-
- TBD
CL = 10 pF, VDD > 2.7 V
-
- TBD
Pulse width of external
-
tEXTIpw signals detected by the EXTI
controller
10
-
-
ns
1. Based on characterization data, not tested in production.
2. The I/O speed is configured using the OSPEEDRy[1:0] bits. Refer to the STM32F20/21xxx reference manual for a
description of the GPIOx_SPEEDR GPIO port output speed register.
3. TBD stands for “to be defined”.
4. The maximum frequency is defined in Figure 37.
5. For maximum frequencies above 50 MHz, the compensation cell should be used.
Figure 37. I/O AC characteristics definition
90%
50%
10%
10%
50%
90%
5.3.17
EXTERNAL
OUTPUT
ON 50pF
tr(IO)out
tr(IO)out
T
Maximum frequency is achieved if (tr + tf) ≤ 2/3)T and if the duty cycle is (45-55%)
when loaded by 50pF
ai14131
NRST pin characteristics
The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up
resistor, RPU (see Table 47).
Unless otherwise specified, the parameters given in Table 50 are derived from tests
performed under the ambient temperature and VDD supply voltage conditions summarized
in Table 14.
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