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STM32F051C8T6 Datasheet, PDF (73/104 Pages) STMicroelectronics – Low- and medium-density advanced ARM-based 32-bit MCU with 16 to 64 Kbytes Flash, timers, ADC, DAC and comm. interfaces
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Electrical characteristics
STM32F051x
Input/output AC characteristics
The definition and values of input/output AC characteristics are given in Figure 20 and
Table 52, respectively.
Unless otherwise specified, the parameters given are derived from tests performed under
ambient temperature and VDD supply voltage conditions summarized in Table 20.
Table 52. I/O AC characteristics(1)
OSPEEDRy
[1:0] value(1)
x0
01
Symbol
Parameter
fmax(IO)out Maximum frequency(2)
tf(IO)out
Output high to low level
fall time
tr(IO)out
Output low to high level
rise time
fmax(IO)out Maximum frequency(2)
tf(IO)out
Output high to low level
fall time
tr(IO)out
Output low to high level
rise time
fmax(IO)out Maximum frequency(2)
11
tf(IO)out
Output high to low level
fall time
tr(IO)out
Output low to high level
rise time
FM+
configuration
(4)
fmax(IO)out Maximum frequency(2)
tf(IO)out
Output high to low level
fall time
tr(IO)out
Output low to high level
rise time
Conditions
CL = 50 pF, VDD = 2 V to 3.6 V
CL = 50 pF, VDD = 2 V to 3.6 V
CL = 50 pF, VDD = 2 V to 3.6 V
CL = 50 pF, VDD = 2 V to 3.6 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
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
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
TBD
TBD
TBD
Min Max Unit
-
2 MHz
- 125(3)
ns
- 125(3)
- 10 MHz
- 25(3)
ns
- 25(3)
- 50 MHz
- 30 MHz
- 20 MHz
-
5(3)
-
8(3)
- 12(3)
ns
-
5(3)
-
8(3)
- 12(3)
- TBD MHz
- TBD
ns
- TBD
tEXTIpw
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.
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Doc ID 022265 Rev 3
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