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Electrical characteristics STM32F745xx STM32F746xx
142/227 DocID027590 Rev 4
Input/output AC characteristics
The definition and values of input/output AC characteristics are given in Figure 39 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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