STM32F373C8 datasheet(89/131 Pages) STMICROELECTRONICS

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STM32F37xxx

Electrical characteristics

114

Figure 21. I/O AC characteristics definition

6.3.15

NRST characteristics

NRST pin characteristics

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

resistor, RPU (see Table 52).

Unless otherwise specified, the parameters given in Table 55 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 55. 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

500

1. Data based on design simulation only, 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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