Datasheet

Electrical characteristics STM32F20xxx
104/178 DocID15818 Rev 11
Input/output AC characteristics
The definition and values of input/output AC characteristics are given in Figure 38 and
Table 48 , respectively.
Unless otherwise specified, the parameters given in Table 48 are derived from tests
performed under the ambient temperature and V
DD
supply voltage conditions summarized
in Table 14.
Table 48. I/O AC characteristics
(1)
OSPEEDRy
[1:0] bit
value
(1)
Symbol Parameter Conditions Min Typ Max Unit
00
f
max(IO)out
Maximum frequency
(2)
C
L
= 50 pF, V
DD >
2.70 V - - 4
MHz
C
L
= 50 pF, V
DD >
1.8 V - - 2
C
L
= 10 pF, V
DD >
2.70 V - - 8
C
L
= 10 pF, V
DD >
1.8 V - - 4
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
= 1.8 V to
3.6 V
--100ns
01
f
max(IO)out
Maximum frequency
(2)
C
L
= 50 pF, V
DD >
2.70 V - - 25
MHz
C
L
= 50 pF, V
DD >
1.8 V - - 12.5
C
L
= 10 pF, V
DD >
2.70 V - - 50
(3)
C
L
= 10 pF, V
DD >
1.8 V - - 20
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
= 50 pF, V
DD >
1.8 V - - 20
C
L
= 10 pF, V
DD >
2.70 V - - 6
C
L
= 10 pF, V
DD >
1.8 V - - 10
10
f
max(IO)out
Maximum frequency
(2)
C
L
= 40 pF, V
DD >
2.70 V - - 25
MHz
C
L
= 40 pF, V
DD >
1.8 V - - 20
C
L
= 10 pF, V
DD >
2.70 V - - 100
(3)
C
L
= 10 pF, V
DD >
1.8 V - - 50
(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
= 40 pF, V
DD >
2.70 V - - 6
ns
C
L
= 40 pF, V
DD >
1.8 V - - 10
C
L
= 10 pF, V
DD >
2.70 V - 4
C
L
= 10 pF, V
DD >
1.8 V - 6