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STM32F103C4T6A bảng dữ liệu(PDF) 62 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  Low-density performance line, ARM-based 32-bit MCU with 16 or 32 KB Flash, USB, CAN, 6 timers, 2 ADCs, 6 com. interfaces
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STM32F103C4T6A bảng dữ liệu(HTML) 62 Page - STMicroelectronics

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Electrical characteristics
STM32F103x4, STM32F103x6
62/90
Doc ID 15060 Rev 6
Figure 27.
I/O AC characteristics definition
5.3.14
NRST pin characteristics
The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up
resistor, RPU (see Table 35).
Unless otherwise specified, the parameters given in Table 38 are derived from tests
performed under the ambient temperature and VDD supply voltage conditions summarized
in Table 9.
ai14131
10%
90%
50%
tr(IO)out
External
Output
on 50pF
Maximum frequency is achieved if (tr + tf) 2/3)T and if the duty cycle is (45-55%)
10%
50%
90%
when loaded by 50 pF
T
tr(IO)out
Table 38.
NRST pin characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VIL(NRST)
(1)
1.
Guaranteed by design, not tested in production.
NRST Input low level voltage
–0.5
0.8
V
VIH(NRST)
(1)
NRST Input high level voltage
2
VDD+0.5
Vhys(NRST)
NRST Schmitt trigger voltage
hysteresis
200
mV
RPU
Weak pull-up equivalent resistor(2)
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)
.
VIN = VSS
30
40
50
k
Ω
VF(NRST)
(1)
NRST Input filtered pulse
100
ns
VNF(NRST)
(1)
NRST Input not filtered pulse
300
ns



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