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DS10668 Rev 6 83/126
STM32L031x4/6 Electrical characteristics
96
Input/output AC characteristics
The definition and values of input/output AC characteristics are given in Figure 27 and
Table 55, respectively.
Unless otherwise specified, the parameters given in Table 55 are derived from tests
performed under ambient temperature and V
DD
supply voltage conditions summarized in
Table 20.
Table 55. I/O AC characteristics
(1)
OSPEEDRx
[1:0] bit value
(1)
Symbol Parameter Conditions Min Max
(2)
Unit
00
f
max(IO)out
Maximum frequency
(3)
C
L
= 50 pF, V
DD
= 2.7 V to 3.6 V - 400
kHz
C
L
= 50 pF, V
DD
= 1.65 V to 2.7 V - 100
t
f(IO)out
t
r(IO)out
Output rise and fall time
C
L
= 50 pF, V
DD
= 2.7 V to 3.6 V - 125
ns
C
L
= 50 pF, V
DD
= 1.65 V to 2.7 V - 320
01
f
max(IO)out
Maximum frequency
(3)
C
L
= 50 pF, V
DD
= 2.7 V to 3.6 V - 2
MHz
C
L
= 50 pF, V
DD
= 1.65 V to 2.7 V - 0.6
t
f(IO)out
t
r(IO)out
Output rise and fall time
C
L
= 50 pF, V
DD
= 2.7 V to 3.6 V - 30
ns
C
L
= 50 pF, V
DD
= 1.65 V to 2.7 V - 65
10
F
max(IO)out
Maximum frequency
(3)
C
L
= 50 pF, V
DD
= 2.7 V to 3.6 V - 10
MHz
C
L
= 50 pF, V
DD
= 1.65 V to 2.7 V - 2
t
f(IO)out
t
r(IO)out
Output rise and fall time
C
L
= 50 pF, V
DD
= 2.7 V to 3.6 V - 13
ns
C
L
= 50 pF, V
DD
= 1.65 V to 2.7 V - 28
11
F
max(IO)out
Maximum frequency
(3)
C
L
= 30 pF, V
DD
= 2.7 V to 3.6 V - 35
MHz
C
L
= 50 pF, V
DD
= 1.65 V to 2.7 V - 10
t
f(IO)out
t
r(IO)out
Output rise and fall time
C
L
= 30 pF, V
DD
= 2.7 V to 3.6 V - 6
ns
C
L
= 50 pF, V
DD
= 1.65 V to 2.7 V - 17
Fm+
configuration
(4)
f
max(IO)out
Maximum frequency
(3)
C
L
= 50 pF, V
DD
= 2.5 V to 3.6 V
-1MHz
t
f(IO)out
Output fall time - 10
ns
t
r(IO)out
Output rise time - 30
f
max(IO)out
Maximum frequency
(3)
C
L
= 50 pF, V
DD
= 1.65 V to 3.6 V
-350KHz
t
f(IO)out
Output fall time - 15
ns
t
r(IO)out
Output rise time - 60
-t
EXTIpw
Pulse width of external
signals detected by the
EXTI controller
-8-ns
1. The I/O speed is configured using the OSPEEDRx[1:0] bits. Refer to the line reference manual for a description of GPIO Port
configuration register.
2. Guaranteed by design.
3. The maximum frequency is defined in Figure 27.
4. When Fm+ configuration is set, the I/O speed control is bypassed. Refer to the line reference manual for a detailed
description of Fm+ I/O configuration.
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