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STM32F302X8 bảng dữ liệu(PDF) 91 Page - STMicroelectronics

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STM32F302X8 bảng dữ liệu(HTML) 91 Page - STMicroelectronics

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STM32F302x6 STM32F302x8
Electrical characteristics
117
Figure 23. I/O AC characteristics definition
1. See Table 55: I/O AC characteristics.
6.3.15
NRST pin characteristics
The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up
resistor, RPU (see Table 53).
Unless otherwise specified, the parameters given in Table 56 are derived from tests
performed under ambient temperature and VDD supply voltage conditions summarized in
Table 23.
MS34942V1
10%
90%
50%
tr(IO)out
External
output on CL
Maximum frequency is achieved if (tr + tf) ≤ 2/3)T and if the duty cycle is (45-55%)
10%
50%
90%
when loaded by CL
T
tf(IO)out
(see note 1).
Table 56. NRST pin characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VIL(NRST)(1) NRST Input low level voltage
-
-
-
0.3VDD+
0.07(1)
V
VIH(NRST)(1) NRST Input high level voltage
-
0.445VDD+
0.398(1)
--
Vhys(NRST) NRST Schmitt trigger voltage hysteresis
-
-
200
-
mV
RPU
Weak pull-up equivalent resistor(2)
VIN = VSS
25
40
55
k
Ω
VF(NRST)(1) NRST Input filtered pulse
-
-
-
100(1)
ns
VNF(NRST)(1) NRST Input not filtered pulse
-
500(1)
--
ns
1. Guaranteed by design.
2. The pull-up is designed with a true resistance in series with a switchable PMOS. This PMOS contribution to the series
resistance must be minimum
(~10% order)
.



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