STM32F042X4 Datasheet, PDF (77/117 Pages) STMicroelectronics – Reset and power management

STM32F042x4 STM32F042x6
Electrical characteristics
Table 52. I/O AC characteristics⁽¹⁾⁽²⁾ (continued)
OSPEEDRy
[1:0] value⁽¹⁾
Symbol
Parameter
Fm+
configuration
(4)
-
f_max(IO)out Maximum frequency⁽³⁾
t_f(IO)out Output fall time
t_r(IO)out Output rise time
f_max(IO)out Maximum frequency⁽³⁾
t_f(IO)out Output fall time
t_r(IO)out Output rise time
t_EXTIpw
Pulse width of external
signals detected by the
EXTI controller
Conditions
C_L = 50 pF, V_DDIOx ≥ 2 V
C_L = 50 pF, V_DDIOx < 2 V
-
Min Max Unit
-
2 MHz
-
12
ns
-
34
-
0.5 MHz
-
16
ns
-
44
10
-
ns
1. The I/O speed is configured using the OSPEEDRx[1:0] bits. Refer to the STM32F0xxxx RM0091 reference manual for a
description of GPIO Port configuration register.
2. Guaranteed by design, not tested in production.
3. The maximum frequency is defined in Figure 24.
4. When Fm+ configuration is set, the I/O speed control is bypassed. Refer to the STM32F0xxxx reference manual RM0091
for a detailed description of Fm+ I/O configuration.
Figure 24. I/O AC characteristics definition






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6.3.15
NRST pin characteristics
The NRST pin input driver uses the CMOS technology. It is connected to a permanent pull-
up resistor, R_PU.
Unless otherwise specified, the parameters given in the table below are derived from tests
performed under the ambient temperature and supply voltage conditions summarized in
Table 21: General operating conditions.
Table 53. NRST pin characteristics
Symbol
Parameter
Conditions
Min
Typ
V_IL(NRST) NRST input low level voltage
-
-
-
V_IH(NRST) NRST input high level voltage
-
0.445 V_DD+0.398⁽¹⁾ -
Max
0.3 V_DD+0.07⁽¹⁾
-
Unit
V
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