STM32F103C8 datasheet(68/105 Pages) STMICROELECTRONICS

68 / 105 page

Electrical characteristics

STM32F103x8, STM32F103xB

68/105

Doc ID 13587 Rev 15

Figure 30.

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 35).

Unless otherwise specified, the parameters given in Table 38 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

External

Output

on 50pF

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

10%

50%

90%

when loaded by 50 pF

tr(IO)out

Table 38.

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

300

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