STM32F318C8 datasheet(84/125 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F318C8 STM32F318K8

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DocID026294 Rev 5

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 51

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

6.3.15

NPOR pin characteristics

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

up resistor, Rpu (see Table 52) connected to VDDA supply.

Unless otherwise specified, the parameters given in Table 52 are derived from tests

performed under ambient temperature and VDDA supply voltage conditions summarized in

Table 20

Table 52. NPOR pin characteristics

Symbol(1)

Parameter

Conditions

Min

Typ

Max

Unit

VIL(NPOR)

NPOR Input low level

voltage

0.475 VDDA - 0.2

VIH(NPOR)

NPOR Input low level

voltage

0.5 VDDA +0.2

Vhys(NPOR)

NPOR Schmitt trigger

voltage hysteresis

100

RPU

Weak pull-up equivalent

resistor(2)

VIN = VSS



1. Guaranteed 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).

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