STM32L15XRC datasheet(88/136 Pages) STMICROELECTRONICS

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Electrical characteristics

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DocID022799 Rev 12

Figure 19. I/O AC characteristics definition

6.3.14

NRST pin characteristics

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

resistor, RPU (see Table 46)

Unless otherwise specified, the parameters given in Table 46 are derived from tests

performed under the conditions summarized in Table 14.

Table 46. NRST pin characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIL(NRST)(1)

NRST input low level

voltage

0.3 VDD

VIH(NRST)(1)

NRST input high

level voltage

-0.39VDD+0.59

VOL(NRST)(1)

NRST output low

level voltage

IOL = 2 mA

2.7 V < VDD < 3.6 V

0.4

IOL = 1.5 mA

1.65 V < VDD < 2.7 V

Vhys(NRST)(1)

NRST Schmitt trigger

voltage hysteresis

10%VDD(2)

-mV

RPU

Weak pull-up

equivalent resistor(3)

VIN = VSS

VF(NRST)(1)

NRST input filtered

pulse

VNF(NRST)(3)

NRST input not

filtered pulse

-350

1. Guaranteed by design.

2. With a minimum of 200 mV.

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

resistance is around 10%.

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