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STM32F051R6 Arkusz danych(PDF) 75 Page - STMicroelectronics

Numer części STM32F051R6
Szczegółowy opis  Low- and medium-density advanced ARM??based 32-bit MCU with 16 to 64 Kbytes Flash, timers, ADC, DAC and comm. interfaces
PDF  104 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
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STM32F051R6 Arkusz danych(HTML) 75 Page - STMicroelectronics

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Electrical characteristics
STM32F051x
76/105
Doc ID 022265 Rev 3
6.3.14
NRST pin characteristics
The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up
resistor, RPU (see Table 50).
Unless otherwise specified, the parameters given in Table 53 are derived from tests
performed under ambient temperature and VDD supply voltage conditions summarized in
Table 20.
Figure 21.
Recommended NRST pin protection
1.
The reset network protects the device against parasitic resets.
2.
The user must ensure that the level on the NRST pin can go below the VIL(NRST) max level specified in
Table 53. Otherwise the reset will not be taken into account by the device.
Table 53.
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
–0.3
-
0.8
V
VIH(NRST)
(1)
NRST Input high level voltage
2
-
VDD+0.3
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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