STM32L151VD datasheet(100/140 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32L151xD STM32L152xD

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Doc ID 022027 Rev 6

Figure 25.

I/O AC characteristics definition

6.3.14

NRST pin characteristics

The NRST pin input driver uses CMOS technology.

Unless otherwise specified, the parameters given in Table 53 are derived from tests

performed under ambient temperature and VDD supply voltage conditions summarized in

Table 14.

ai14131

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

tr(IO)out

Table 53.

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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