STM32L100RC datasheet(76/104 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32L100RC

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DocID024995 Rev 4

Figure 14. 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 the 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

-0.39VDD+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

1.65 V < VDD < 2.7 V

Vhys(NRST)(1)

NRST Schmitt trigger

voltage hysteresis

10%VDD(2)

-mV

RPU

Weak pull-up

equivalent resistor(3)

VIN = VSS

VF(NRST)(1)

NRST input filtered

pulse

VNF(NRST)(3)

NRST input not

filtered pulse

-350

1. Guaranteed by design, not tested in production.

2. With a minimum of 200 mV.

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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