Datasheet

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STM32F405xx, STM32F407xx Electrical characteristics
Input/output AC characteristics
The definition and values of input/output AC characteristics are given in Figure 37 and
Table 50, respectively.
Unless otherwise specified, the parameters given in Table 50 are derived from tests
performed under the ambient temperature and V
DD
supply voltage conditions summarized
in
Table 14.
Table 50. I/O AC characteristics
(1)(2)
OSPEEDRy
[1:0] bit
value
(1)
Symbol Parameter Conditions Min Typ Max Unit
00
f
max(IO)out
Maximum frequency
(3)
C
L
= 50 pF, V
DD >
2.70 V - - 4
MHz
C
L
= 50 pF, V
DD >
1.8 V - - 2
C
L
= 10 pF, V
DD >
2.70 V - - 8
C
L
= 10 pF, V
DD >
1.8 V - - 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
= 50 pF, V
DD
= 1.8 V to
3.6 V
--100ns
01
f
max(IO)out
Maximum frequency
(3)
C
L
= 50 pF, V
DD >
2.70 V - - 25
MHz
C
L
= 50 pF, V
DD >
1.8 V - - 12.5
C
L
= 10 pF, V
DD >
2.70 V - - 50
(4)
C
L
= 10 pF, V
DD >
1.8 V - - 20
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
= 50 pF, V
DD
>2.7 V - - 10
ns
C
L
= 50 pF, V
DD
> 1.8 V - - 20
C
L
= 10 pF, V
DD >
2.70 V - - 6
C
L
= 10 pF, V
DD >
1.8 V - - 10
10
f
max(IO)out
Maximum frequency
(3)
C
L
= 40 pF, V
DD >
2.70 V - - 50
(4)
MHz
C
L
= 40 pF, V
DD >
1.8 V - - 25
C
L
= 10 pF, V
DD >
2.70 V - - 100
(4)
C
L
= 10 pF, V
DD >
1.8 V - - 50
(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
= 40 pF, V
DD >
2.70 V - - 6
ns
C
L
= 40 pF, V
DD >
1.8 V - - 10
C
L
= 10 pF, V
DD >
2.70 V - - 4
C
L
= 10 pF, V
DD >
1.8 V - - 6