STM32L053 datasheet(89/132 Pages) STMICROELECTRONICS

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STM32L053x6 STM32L053x8

Electrical characteristics

112

Figure 24. 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 , except when it is internally driven low (see Table 61).

Unless otherwise specified, the parameters given in Table 61 are derived from tests

performed under ambient temperature and VDD supply voltage conditions summarized in

Table 24.

Table 61. NRST pin characteristics

Symbol

Parameter

Conditions

Min

Typ

Max Unit

VIL(NRST)(1)

1. Guaranteed by design.

NRST input low level voltage

VSS

-0.8

VIH(NRST)(1) NRST input high level voltage

1.4

VDD

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)

2. 200 mV minimum value

-mV

RPU

Weak pull-up equivalent

resistor(3)

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%.

VIN = VSS

VF(NRST)(1) NRST input filtered pulse

VNF(NRST)(1) NRST input not filtered pulse

350

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