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STM32F107RC 데이터시트(PDF) 62 Page - STMicroelectronics

부품명 STM32F107RC
상세설명  Connectivity line, ARM®-based 32-bit MCU with 64/256 KB Flash, USB OTG, Ethernet, 10 timers, 2 CANs, 2 ADCs, 14 communication interfaces
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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STM32F107RC 데이터시트(HTML) 62 Page - STMicroelectronics

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Electrical characteristics
STM32F105xx, STM32F107xx
62/108
DocID15274 Rev 10
Figure 22. 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 36).
Unless otherwise specified, the parameters given in Table 39 are derived from tests
performed under the ambient temperature and VDD supply voltage conditions summarized
in Table 9.
ai14131
tr(IO)out
50%
90%
T
tf(IO)out
Maximum frequency is achieved if (t + t ) < (2/3)T and if the duty cycle is (45-55%)
when loaded by 50 pF
r
f
EXTERNAL
OUTPUT
ON 50 pF
10%
50%
90%
10%
Table 39. 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
VDD > 2.7 V
300
-
-
ns



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