Datasheet

Electrical characteristics STM32F051x
74/105 Doc ID 022265 Rev 3
Input/output AC characteristics
The definition and values of input/output AC characteristics are given in Figure 20 and
Table 5 2 , respectively.
Unless otherwise specified, the parameters given are derived from tests performed under
ambient temperature and V
DD
supply voltage conditions summarized in Table 2 0 .
Table 52. I/O AC characteristics
(1)
OSPEEDRy
[1:0] value
(1)
Symbol Parameter Conditions Min Max Unit
x0
f
max(IO)out
Maximum frequency
(2)
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)
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)
FM+
configuration
(4)
f
max(IO)out
Maximum frequency
(2)
TBD - TBD MHz
t
f(IO)out
Output high to low level
fall time
TBD - TBD
ns
t
r(IO)out
Output low to high level
rise time
TBD - TBD
t
EXTIpw
Pulse width of external
signals detected by the
EXTI controller
10 - ns
1. The I/O speed is configured using the OSPEEDRx[1:0] bits. Refer to the RM0091 reference manual for a description of
GPIO Port configuration register.
2. The maximum frequency is defined in Figure 20.
3. Guaranteed by design, not tested in production.
4. The I/O speed configuration is bypassed in FM+ I/O mode. Refer to the STM32F05xxx reference manual RM0091 for a
description of FM+ I/O mode configuration.