QST508AH0 datasheet(39/51 Pages) STMICROELECTRONICS

39 / 51 page

QST108

Electrical characteristics

39/51

6.8

RESET pin

TA = -40°C to 125°C, unless otherwise specified.

Table 33.

RESET pin characteristics

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Unit

VIL

Input low level voltage

VSS − 0.3

0.3x VDD

VIH

Input high level voltage

0.7 x VDD

VDD + 0.3

Vhys

Schmitt trigger voltage

hysteresis(1)

Data based on characterization results, not tested in production.

VOL

Output low level

voltage(2)

The IIO current sunk must always respect the absolute maximum rating specified in Table 22: Current

characteristics on page 31 and the sum of IIO (I/O ports and control pins) must not exceed IVSS.

VDD = 5V IIO = +2mA

200

RON

Pull-up equivalent

resistor(3)

The RON pull-up equivalent resistor is based on a resistive transistor. Specified for voltages on RESET pin

between VILmax and VDD.

VIN = VSS

VDD = 5V

VDD = 3V

90(1)

tw(RSTL)out

Generated reset pulse

duration

Internal reset sources

90(1)

μs

th(RSTL)in

External reset pulse

hold time(4)

To guarantee the reset of the device, a minimum pulse has to be applied to the RESET pin. All short pulses

applied on RESET pin with a duration below th(RSTL)in can be ignored.

μs

tg(RSTL)in Filtered glitch duration

200

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