Electrical characteristics
STM32F103x8, STM32F103xB
Input/output AC characteristics
The definition and values of input/output AC characteristics are given in Figure 29 and
Table 36, respectively.
Unless otherwise specified, the parameters given in Table 36 are derived from tests
performed under the ambient temperature and V supply voltage conditions summarized
DD
in Table 9.
(1)
Table 36. I/O AC characteristics
MODEx[1:0]
Symbol
Parameter
Conditions
Min Max Unit
bit value(1)
fmax(IO)out Maximum frequency(2) CL = 50 pF, VDD = 2 V to 3.6 V
2
MHz
ns
Output high to low
tf(IO)out
125(3)
10
level fall time
CL = 50 pF, VDD = 2 V to 3.6 V
Output low to high
tr(IO)out
125(3)
10
level rise time
fmax(IO)out Maximum frequency(2) CL = 50 pF, VDD = 2 V to 3.6 V
MHz
ns
Output high to low
tf(IO)out
25(3)
01
level fall time
CL = 50 pF, VDD = 2 V to 3.6 V
Output low to high
tr(IO)out
25(3)
level rise time
CL = 30 pF, VDD = 2.7 V to 3.6 V
Fmax(IO)out Maximum frequency(2) CL = 50 pF, VDD = 2.7 V to 3.6 V
CL = 50 pF, VDD = 2 V to 2.7 V
50
30
MHz
MHz
MHz
20
CL = 30 pF, VDD = 2.7 V to 3.6 V
Output high to low
level fall time
5(3)
8(3)
12(3)
5(3)
8(3)
12(3)
11
tf(IO)out
tr(IO)out
tEXTIpw
CL = 50 pF, VDD = 2.7 V to 3.6 V
CL = 50 pF, VDD = 2 V to 2.7 V
CL = 30 pF, VDD = 2.7 V to 3.6 V
CL = 50 pF, VDD = 2.7 V to 3.6 V
CL = 50 pF, VDD = 2 V to 2.7 V
ns
Output low to high
level rise time
Pulse width of
external signals
detected by the EXTI
controller
-
10
ns
1. The I/O speed is configured using the MODEx[1:0] bits. Refer to the STM32F10xxx reference manual for a
description of GPIO Port configuration register.
2. The maximum frequency is defined in Figure 29.
3. Guaranteed by design, not tested in production.
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