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STM32F427xx STM32F429xx Electrical characteristics
198
Input/output AC characteristics
The definition and values of input/output AC characteristics are given in Figure 36 and
Table 58 , respectively.
Unless otherwise specified, the parameters given in Table 58 are derived from tests
performed under the ambient temperature and V
DD
supply voltage conditions summarized
in Table 17.
Table 58. 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
≥ 2.7 V - - 4
MHz
C
L
= 50 pF, V
DD
≥ 1.7 V - - 2
C
L
= 10 pF, V
DD
≥ 2.7 V - - 8
C
L
= 10 pF, V
DD
≥ 1.8 V - - 4
C
L
= 10 pF, V
DD
≥ 1.7 V - - 3
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
= 1.7 V to
3.6 V
--100ns
01
f
max(IO)out
Maximum frequency
(3)
C
L
= 50 pF, V
DD
≥ 2.7 V - - 25
MHz
C
L
= 50 pF, V
DD
≥ 1.8 V - - 12.5
C
L
= 50 pF, V
DD
≥ 1.7 V - - 10
C
L
= 10 pF, V
DD
≥ 2.7 V - - 50
C
L
= 10 pF, V
DD
≥ 1.8 V - - 20
C
L
= 10 pF, V
DD
≥ 1.7 V - - 12.5
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
= 10 pF, V
DD
≥ 2.7 V - - 6
C
L
= 50 pF, V
DD
≥ 1.7 V - - 20
C
L
= 10 pF, V
DD
≥ 1.7 V - - 10
10
f
max(IO)out
Maximum frequency
(3)
C
L
= 40 pF, V
DD
≥ 2.7 V - - 50
(4)
MHz
C
L
= 10 pF, V
DD
≥ 2.7 V - - 100
(4)
C
L
= 40 pF, V
DD
≥ 1.7 V - - 25
C
L
= 10 pF, V
DD
≥ 1.8 V - - 50
C
L
= 10 pF, V
DD
≥ 1.7 V - - 42.5
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
≥2.7 V - - 6
ns
C
L
= 10 pF, V
DD
≥ 2.7 V - - 4
C
L
= 40 pF, V
DD
≥ 1.7 V - - 10
C
L
= 10 pF, V
DD
≥ 1.7 V - - 6
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