STM32F372R8 datasheet(87/128 Pages) STMICROELECTRONICS

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STM32F37x

Electrical characteristics

Doc ID 022691 Rev 3

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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.

ai14131

10%

90%

50%

tr(IO)out

OUTPUT

EXT ERNAL

ON 50pF

Maximum fr equency is achieved if (tr + tf) 2/3)T and if the duty cycle is (45-55%)

10%

50%

90%

when loaded by 50pF

tr(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

0.445

VDD+

0.398

(1)

Data based on design simulation only. Not tested in production.

Vhys(NRST)

(1) NRST Schmitt trigger voltage

hysteresis

200

RPU

Weak pull-up equivalent resistor(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



VF(NRST)

(1)

NRST Input filtered pulse

100

VNF(NRST)

(1)

NRST Input not filtered pulse

500

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