STM32F101ZC datasheet(85/112 Pages) STMICROELECTRONICS

85 / 112 page

STM32F101xC, STM32F101xD, STM32F101xE

Electrical characteristics

Doc ID 14610 Rev 8

85/112

Figure 43.

I/O AC characteristics definition

5.3.15

NRST pin characteristics

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

resistor, RPU (see Table 46).

Unless otherwise specified, the parameters given in Table 49 are derived from tests

performed under ambient temperature and VDD supply voltage conditions summarized in

Table 10.

Figure 44.

Recommended NRST pin protection

The reset network protects the device against parasitic resets.

The user must ensure that the level on the NRST pin can go below the VIL(NRST) max level specified in

Table 49. Otherwise the reset will not be taken into account by the device.

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 49.

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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