STM32L151VBT6DTR datasheet(82/121 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32L151x6/8/B, STM32L152x6/8/B

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Doc ID 17659 Rev 8

Figure 18.

I/O AC characteristics definition

6.3.13

NRST pin characteristics

The NRST pin input driver uses CMOS technology.

Unless otherwise specified, the parameters given in Table 45 are derived from tests

performed under ambient temperature and VDD supply voltage conditions summarized in

Table 14.

ai14131b

10%

90%

50%

tr( IO)out

External

Output

on 50pF

Maximum frequency is achieved if (tr + tf) ≤ 2/3)T and if the duty cycle is (45-55%)

10%

50%

90%

when loaded by 50 pF

tf(IO)out

Table 45.

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

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)

200 mV minimum value

RPU

Weak pull-up equivalent

resistor(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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