STM32U385CG datasheet(147/224 Pages) STMICROELECTRONICS

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Figure 37. Output AC characteristics definition

Maximum frequency is achieved with a duty cycle at (45 - 55%) when loaded by the

specified capacitance.

10%

50%

90%

10%

50%

90%

r(IO)out

f(IO)out

5.3.15

NRST pin characteristics

The NRST pin input driver uses the CMOS technology. It is connected to a permanent pullup 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 27

Table 92. NRST pin characteristics

Specified by design and not tested in production.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIL(NRST)

NRST input low-level voltage

0.3 x VDDIOx

VIH(NRST)

NRST input high-level voltage

0.7 x VDDIOx

Vhys(NRST)

NRST Schmitt trigger voltage hysteresis

200

RPU

Weak pull-up equivalent resistor(1)

VIN = VSS

kΩ

tF(NRST)

NRST input filtered pulse

tNF(NRST)

NRST input not-filtered pulse

1.71 V ≤ VDD ≤ 3.6 V

330

1.58 V ≤ VDD ≤ 3.6 V

1000

1. 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).

Figure 38. Recommended NRST pin protection

RPU

VDD

Internal reset

External

reset circuit(1)

NRST(2)

Filter

0.1 µF(3)

(1): The reset network protects the device against parasitic resets.

STM32U385xx

Electrical characteristics

DS14830 - Rev 2

page 147/224

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