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STM32F102XB датащи(PDF) 57 Page - STMicroelectronics

номер детали STM32F102XB
подробное описание детали  Medium-density USB access line, ARM-based 32b MCU with 64/128KB Flash, USB FS, 6 timers, ADC & 8 com. interfaces
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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STM32F102XB датащи(HTML) 57 Page - STMicroelectronics

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STM32F102x8, STM32F102xB
Electrical characteristics
79
Figure 24. 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 ambient temperature and VDD supply voltage conditions summarized in
Table 8.
ai14131c
10%
90%
50%
tr(IO)out
OUTPUT
EXTERNAL
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 50pF
T
tf(IO)out
Table 37. 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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