STM32L4S5AI datasheet(184/275 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32L4S5xx, STM32L4S7xx and STM32L4S9xx

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DocID030322 Rev 2

Figure 33. I/O AC characteristics definition(1)

1. Refer to Table 69: I/O AC characteristics.

6.3.18

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 22: General operating conditions.

MS32132V2

10%

50%

90%

10%

50%

90%

Maximum frequency is achieved if (t + t (≤ 2/3)T and if the duty cycle is (45-55%)

when loaded by the specified capacitance.

r(IO)out

f(IO)out

Table 70. NRST pin characteristics(1)

Guaranteed by design.

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)

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

kΩ

VF(NRST)

NRST input filtered

pulse

VNF(NRST)

NRST input not filtered

pulse

1.71 V ≤ VDD

≤ 3.6 V

350

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