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STM32H7 bảng dữ liệu(PDF) 145 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  32-bit Arm® Cortex®-M7 480MHz MCUs, up to 2MB flash, up to 1MB RAM, 46 com. and analog interfaces
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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STM32H7 bảng dữ liệu(HTML) 145 Page - STMicroelectronics

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DS12110 Rev 10
145/357
STM32H742xI/G STM32H743xI/G
Electrical characteristics (rev Y)
320
6.3.16
NRST pin characteristics
The NRST pin input driver uses CMOS technology. It is connected to a permanent pull-up
resistor, RPU (see Table 60: I/O static characteristics).
Unless otherwise specified, the parameters given in Table 65 are derived from tests
performed under the ambient temperature and VDD supply voltage conditions summarized
in Table 24: General operating conditions.
Figure 23. 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 60. Otherwise the reset is not taken into account by the device.
Table 65. NRST pin characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
RPU(2)
Weak pull-up equivalent
resistor(1)
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)
.
VIN = VSS
30
40
50
㏀
VF(NRST)(2)
2. Guaranteed by design.
NRST Input filtered pulse
1.71 V < VDD < 3.6 V
-
-
50
ns
VNF(NRST)(2) NRST Input not filtered pulse
1.71 V < VDD < 3.6 V
300
-
-
1.62 V < VDD < 3.6 V
1000
-
-
ai14132d
STM32
RPU
NRST(2)
VDD
Filter
Internal Reset
0.1 μF
External
reset circuit (1)



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