STM32L432KB datasheet(107/149 Pages) STMICROELECTRONICS

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STM32L432KB STM3L432KC

Electrical characteristics

142

Figure 18. I/O AC characteristics definition(1)

1. Refer to Table 58: I/O AC characteristics.

6.3.15

NRST pin characteristics

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

up resistor, RPU.

Unless otherwise specified, the parameters given in the table below are derived from tests

performed under the ambient temperature and supply voltage conditions summarized in

Table 20: General operating conditions.

Table 59. NRST pin characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIL(NRST)

NRST input low level

voltage

0.3ₓVDDIOx

VIH(NRST)

NRST input high level

voltage

-0.7ₓVDDIOx

Vhys(NRST)

NRST Schmitt trigger

voltage hysteresis

200

RPU

Weak pull-up

equivalent resistor(2)

VIN = VSS

kΩ

VF(NRST)

NRST input filtered

pulse

VNF(NRST)

NRST input not filtered

pulse

1.71 V ≤ VDD ≤ 3.6 V

350

Guaranteed by design.

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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