STM32L072CB datasheet(100/160 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32L072xx

100/160

DS10689 Rev 5

Figure 28. 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 63).

Unless otherwise specified, the parameters given in Table 63 are derived from tests

performed under ambient temperature and VDD supply voltage conditions summarized in

Table 26.

ai14131d

10%

90%

50%

tr(IO)out

OUTPUT

EXTERNAL

ON CL

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

when loaded by CL specified in the table “

I/O AC characteristics”.

10%

50%

90%

tf(IO)out

Table 63. 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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