STM32F378CC datasheet(88/131 Pages) STMICROELECTRONICS

88 / 131 page

Electrical characteristics

STM32F378xx

88/131

DocID025608 Rev 4

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.

NPOR pin characteristics

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

resistor to the VDDA, RPU (see Table 50).

Unless otherwise specified, the parameters given in Table 54 are derived from tests

performed under ambient temperature and VDDA supply voltage conditions summarized in

Table 22.

Table 54. NPOR pin characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIL(NPOR)(1)

1. Guaranteed by design.

NPOR Input low level voltage

0.475VDDA

- 0.2

VIH(NPOR)(1) NPOR Input high level voltage

0.5VDDA

+ 0.2

Vhys(NPOR)(1)

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

STM32F378CC Datasheet(PDF) 88 Page - STMicroelectronics