STM32F383CC datasheet(86/125 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F383xx

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DocID023367 Rev 2

Figure 19. I/O AC characteristics definition

6.3.14

NRST and NPOR pins characteristics

NRST pin characteristics

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

resistor, RPU (see Table 49).

Unless otherwise specified, the parameters given in Table 52 are derived from tests

performed under ambient temperature and VDD supply voltage conditions summarized in

Table 22.

MS32132V1

10%

50%

90%

10%

50%

90%

EXTERNAL

OUTPUT

ON 50 pF

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

when loaded by 50 pF

r(IO)out

f(IO)out

Table 52. NRST pin characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIL(NRST)(1) NRST Input low level voltage

0.3VDD + 0.07(1)

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

0.445VDD + 0.398(1)

Vhys(NRST)(1)

NRST Schmitt trigger voltage

hysteresis

-200

RPU

Weak pull-up equivalent resistor(2)

VIN = VSS

VF(NRST)(1) NRST Input filtered pulse

100

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

700

1. Guaranteed by design, not tested in production.

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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