STM32F107VC datasheet(61/103 Pages) STMICROELECTRONICS

61 / 103 page

STM32F105xx, STM32F107xx

Electrical characteristics

Doc ID 15274 Rev 6

61/104

Figure 22.

I/O AC characteristics definition

5.3.14

NRST pin characteristics

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

resistor, RPU (see Table 36).

Unless otherwise specified, the parameters given in Table 39 are derived from tests

performed under the ambient temperature and VDD supply voltage conditions summarized

in Table 9.

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 39.

NRST pin characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIL(NRST)

(1)

Guaranteed by design, not tested in production.

NRST Input low level voltage

–0.5

0.8

VIH(NRST)

(1)

NRST Input high level voltage

VDD+0.5

Vhys(NRST)

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 must be minimum

(~10% order)

VIN = VSS

VF(NRST)

(1)

NRST Input filtered pulse

100

VNF(NRST)

(1)

NRST Input not filtered pulse

VDD > 2.7 V

300

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