Datasheet

Electrical characteristics STM32F051x4 STM32F051x6 STM32F051x8
74/121 DocID022265 Rev 6
Input/output AC characteristics
The definition and values of input/output AC characteristics are given in Figure 23 and
Table 50, respectively. Unless otherwise specified, th
e parameters given are derived from
tests performed under the ambient temperature and supply voltage conditions summarized
in Table 20: General operating conditions.
Table 50. I/O AC characteristics
(1)(2)
1. The I/O speed is configured using the OSPEEDRx[1:0] bits. Refer to the STM32F0xxxx RM0091 reference
manual for a description of GPIO Port configuration register.
2. Guaranteed by design, not tested in production.
OSPEEDRy
[1:0]
value
(1)
Symbol Parameter Conditions Min Max Unit
x0
f
max(IO)out
Maximum frequency
(3)
3. The maximum frequency is defined in Figure 23.
C
L
= 50 pF
-2MHz
t
f(IO)out
Output fall time - 125
ns
t
r(IO)out
Output rise time - 125
01
f
max(IO)out
Maximum frequency
(3)
C
L
= 50 pF
-10MHz
t
f(IO)out
Output fall time - 25
ns
t
r(IO)out
Output rise time - 25
11
f
max(IO)out
Maximum frequency
(3)
C
L
= 30 pF, V
DDIOx
≥ 2.7 V - 50
MHzC
L
= 50 pF, V
DDIOx
≥ 2.7 V - 30
C
L
= 50 pF, V
DDIOx
< 2.7 V - 20
t
f(IO)out
Output fall time
C
L
= 30 pF, V
DDIOx
≥ 2.7 V - 5
ns
C
L
= 50 pF, V
DDIOx
≥ 2.7 V - 8
C
L
= 50 pF, V
DDIOx
< 2.7 V - 12
t
r(IO)out
Output rise time
C
L
= 30 pF, V
DDIOx
≥ 2.7 V - 5
C
L
= 50 pF, V
DDIOx
≥ 2.7 V - 8
C
L
= 50 pF, V
DDIOx
< 2.7 V - 12
Fm+
configuration
(4)
4. When Fm+ configuration is set, the I/O speed control is bypassed. Refer to the STM32F0xxxx reference
manual RM0091 for a detailed description of Fm+ I/O configuration.
f
max(IO)out
Maximum frequency
(3)
C
L
= 50 pF
-2MHz
t
f(IO)out
Output fall time - 12
ns
t
r(IO)out
Output rise time - 34
t
EXTIpw
Pulse width of external
signals detected by
the EXTI controller
10 - ns
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