STM32L082KB datasheet(89/132 Pages) STMICROELECTRONICS

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DS10688 Rev 7

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STM32L082xx

Electrical characteristics

109

Figure 23. 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 , except when it is internally driven low (see Table 60).

Unless otherwise specified, the parameters given in Table 60 are derived from tests

performed under ambient temperature and VDD supply voltage conditions summarized in

Table 23.

Maximum frequency is achieved with a duty cycle at (45 - 55%) when loaded by the

specified capacitance.

10%

50%

90%

10%

50%

90%

r(IO)out

f(IO)out

Table 60. NRST pin characteristics

Symbol

Parameter

Conditions

Min

Typ

Max Unit

VIL(NRST)(1)

1. Guaranteed by design.

NRST input low level voltage

VSS

-0.8

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

1.4

VDD

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)

2. 200 mV minimum value

-mV

RPU

Weak pull-up equivalent

resistor(3)

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%.

VIN = VSS

VF(NRST)(1) NRST input filtered pulse

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

350

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