STM32L100RB datasheet(74/103 Pages) STMICROELECTRONICS

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Electrical characteristics

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DocID024295 Rev 5

Figure 15. I/O AC characteristics definition

6.3.14

NRST pin characteristics

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

resistor, RPU (see Table 44).

Unless otherwise specified, the parameters given in Table 44 are derived from tests

performed under ambient temperature and VDD supply voltage conditions summarized in

Table 12.

Table 44. NRST pin characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIL(NRST)(1) NRST input low level voltage

0.3 VDD

VIH(NRST)(1) NRST input high level voltage

0.39 VDD+0.59

VOL(NRST)(1) NRST output low level voltage

IOL = 2 mA

2.7 V < VDD < 3.6 V

0.4

IOL = 1.5 mA

1.8 V < VDD < 2.7 V

Vhys(NRST)(1)

NRST Schmitt trigger voltage

hysteresis

10%VDD(2)

RPU

Weak pull-up equivalent

resistor(3)

VIN = VSS

VF(NRST)(1) NRST input filtered pulse

VNF(NRST)(1) NRST input not filtered pulse

350

1. Guaranteed by design.

2. 200 mV minimum value

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

resistance is around 10%.

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