Datasheet

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STM32F091xB STM32F091xC Electrical characteristics
99
Input/output AC characteristics
The definition and values of input/output AC characteristics are given in Figure 24 and
Table 55, respectively. Unless otherwise specified, the parameters given are derived from
tests performed under the ambient temperature and supply voltage conditions summarized
in
Table 24: General operating conditions.
Table 55. I/O AC characteristics
(1)(2)
OSPEEDRy
[1:0] value
(1)
Symbol Parameter Conditions Min Max Unit
x0
f
max(IO)out
Maximum frequency
(3)
C
L
= 50 pF, V
DDIOx
 2 V
-2MHz
t
f(IO)out
Output fall time - 125
ns
t
r(IO)out
Output rise time - 125
f
max(IO)out
Maximum frequency
(3)
C
L
= 50 pF, V
DDIOx
< 2 V
-1MHz
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, V
DDIOx
 2 V
-10MHz
t
f(IO)out
Output fall time - 25
ns
t
r(IO)out
Output rise time - 25
f
max(IO)out
Maximum frequency
(3)
C
L
= 50 pF, V
DDIOx
< 2 V
-4MHz
t
f(IO)out
Output fall time - 62.5
ns
t
r(IO)out
Output rise time - 62.5
11
f
max(IO)out
Maximum frequency
(3)
C
L
= 30 pF, V
DDIOx
 2.7 V - 50
MHz
C
L
= 50 pF, V
DDIOx
 2.7 V - 30
C
L
= 50 pF, 2 V  V
DDIOx
< 2.7 V - 20
C
L
= 50 pF, V
DDIOx
< 2 V - 10
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, 2 V  V
DDIOx
< 2.7 V - 12
C
L
= 50 pF, V
DDIOx
< 2 V - 25
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, 2 V  V
DDIOx
< 2.7 V - 12
C
L
= 50 pF, V
DDIOx
< 2 V - 25
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