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STM32F411RET6 Fiches technique(PDF) 103 Page - STMicroelectronics

No de pièce STM32F411RET6
Description  ARM® Cortex®-M4 32b MCUFPU, 125 DMIPS, 512KB Flash, 128KB RAM, USB OTG FS, 11 TIMs, 1 ADC, 13 comm. interfaces
PDF  149 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM32F411RET6 Fiches technique(HTML) 103 Page - STMicroelectronics

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STM32F411xC STM32F411xE
Electrical characteristics
123
6.3.17
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 the ambient temperature and VDD supply voltage conditions summarized
in Table 14. Refer to Table 53: I/O static characteristics for the values of VIH and VIL for
NRST pin.
Figure 32. 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 56. Otherwise the reset is not taken into account by the device.
Table 56. NRST pin characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
RPU
Weak pull-up equivalent
resistor(1)
VIN = VSS
30
40
50
k
Ω
VF(NRST)(2) NRST Input filtered pulse
-
-
100
ns
VNF(NRST)(2) NRST Input not filtered pulse
VDD > 2.7 V
300
-
-
ns
TNRST_OUT Generated reset pulse duration
Internal Reset
source
20
-
-
µs
1. 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)
.
2. Guaranteed by design.



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