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STM32F105xx, STM32F107xx Electrical characteristics
103
Input/output AC characteristics
The definition and values of input/output AC characteristics are given in Figure 22 and
Table 38, respectively.
Unless otherwise specified, the parameters given in Table 38 are derived from tests
performed under the ambient temperature and V
DD
supply voltage conditions summarized
in Table 9.
Table 38. I/O AC characteristics
(1)
1. The I/O speed is configured using the MODEx[1:0] bits. Refer to the STM32F10xxx reference manual for a
description of GPIO Port configuration register.
MODEx[1:0]
bit value
(1)
Symbol Parameter Conditions Min Max Unit
10
f
max(IO)out
Maximum frequency
(2)
2. The maximum frequency is defined in Figure 22.
C
L
= 50 pF, V
DD
= 2 V to 3.6 V - 2 MHz
t
f(IO)out
Output high to low
level fall time
C
L
= 50 pF, V
DD
= 2 V to 3.6 V
- 125
(3)
3. Guaranteed by design, not tested in production.
ns
t
r(IO)out
Output low to high
level rise time
- 125
(3)
01
f
max(IO)out
Maximum frequency
(2)
C
L
= 50 pF, V
DD
= 2 V to 3.6 V - 10 MHz
t
f(IO)out
Output high to low
level fall time
C
L
= 50 pF, V
DD
= 2 V to 3.6 V
- 25
(3)
ns
t
r(IO)out
Output low to high
level rise time
- 25
(3)
11
F
max(IO)out
Maximum frequency
(2)
C
L
= 30 pF, V
DD
= 2.7 V to 3.6 V - 50 MHz
C
L
= 50 pF, V
DD
= 2.7 V to 3.6 V - 30 MHz
C
L
= 50 pF, V
DD
= 2 V to 2.7 V - 20 MHz
t
f(IO)out
Output high to low
level fall time
C
L
= 30 pF, V
DD
= 2.7 V to 3.6 V - 5
(3)
ns
C
L
= 50 pF, V
DD
= 2.7 V to 3.6 V - 8
(3)
C
L
= 50 pF, V
DD
= 2 V to 2.7 V - 12
(3)
t
r(IO)out
Output low to high
level rise time
C
L
= 30 pF, V
DD
= 2.7 V to 3.6 V - 5
(3)
C
L
= 50 pF, V
DD
= 2.7 V to 3.6 V - 8
(3)
C
L
= 50 pF, V
DD
= 2 V to 2.7 V - 12
(3)
-t
EXTIpw
Pulse width of external
signals detected by
the EXTI controller
-10 - ns