STM32F398VE datasheet(118/151 Pages) STMICROELECTRONICS

118 / 151 page

Electrical characteristics

STM32F398VE

118/151

DocID027227 Rev 2

Figure 35. 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 65

. Otherwise the reset will not be taken into account by the device.

6.3.16

NPOR pin characteristics

The NPOR pin input driver uses CMOS technology. It is connected to a permanent pull-up

resistor, RPU (see Table 66) connected to VDDA supply.

Unless otherwise specified, the parameters given in Table 66 are derived from tests

performed under ambient temperature and VDDA supply voltage conditions summarized in

Table 18

Table 66. NPOR pin characteristics

Symbol(1)

1. Guaranteed by design, not tested in production.

Parameter

Conditions

Min

Typ

Max

Unit

VIL(NPOR) NPOR Input low level voltage

0.475VDDA

- 0.2

VIH(NPOR) NPOR Input high level voltage

0.5VDDA

+ 0.2

Vhys(NPOR)

NPOR Schmitt trigger voltage

hysteresis

100

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 is minimal (~10% order).

VIN VSS



STM32F398VE Datasheet(PDF) 118 Page - STMicroelectronics