STM32F101XF datasheet(85/117 Pages) STMICROELECTRONICS

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STM32F101xF, STM32F101xG

Electrical characteristics

Figure 41. 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 47).

Unless otherwise specified, the parameters given in Table 50 are derived from tests

performed under ambient temperature and VDD supply voltage conditions summarized in

Table 10.

Table 50. NRST pin characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIL(NRST)(1)

1. Guaranteed by design.

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)

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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