STM32U595AI datasheet(268/377 Pages) STMICROELECTRONICS

268 / 377 page

Electrical characteristics

STM32U59xxx

268/377

DS13633 Rev 1

5.3.15

NRST pin characteristics

The NRST pin input driver uses the CMOS technology. It is connected to a permanent

pull-up resistor, RPU.

Unless otherwise specified, the parameters given in the table below are derived from tests

performed under the ambient temperature and supply voltage conditions summarized

in Table 32.

Figure 36. 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 the above table.

Otherwise the reset is not taken into account by the device.

3. The external capacitor on NRST must be placed as close as possible to the device.

Table 91. NRST pin characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIL(NRST) NRST input low-level voltage

0.3 × VDDIOx

VIH(NRST) NRST input high-level voltage

0.7 × VDDIOx

Vhys(NRST)

NRST Schmitt trigger voltage

hysteresis

200

RPU

Weak pull-up equivalent resistor(2)

VIN = VSS

kΩ

tF(NRST)

NRST input filtered pulse

tNF(NRST) NRST input not-filtered pulse

1.71 V ≤ VDD ≤ 3.6 V

330

1.58 V ≤ VDD ≤ 3.6 V

1000

Specified by design. Not tested in production.

2. The pull-up is designed with a true resistance in series with a switchable PMOS. This PMOS contribution to the series

resistance is minimal (~10% order)

MS19878V3

RPU

VDD

Internal reset

External

reset circuit

(1)

NRST

(2)

Filter

0.1 μF

STM32U595AI Datenblatt(PDF) 268 Page - STMicroelectronics

STM32U595AI Datenblatt(HTML) 268 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datenblatt Download

Link URL