STM32F303 datasheet(92/133 Pages) STMICROELECTRONICS

92 / 133 page

Electrical characteristics

STM32F302xx/STM32F303xx

92/133

Doc ID 023353 Rev 5

Figure 23.

I/O AC characteristics definition

6.3.15

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

0.445VDD+

0.398(1)

Vhys(NRST)

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

Guaranteed by design, not tested in production.

The pull-up is designed with a true resistance in series with a switchable PMOS. This PMOS contribution to the series

resistance must be minimum

(~10% order)

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