L4993 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

L4993

Low drop voltage regulator

STMicroelectronics 

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Electrical specifications

L4993

Table 7. Watchdog (continued)

Pin Symbol

Parameter

Test condition Min. Typ. Max. Unit

Vcw

Icwd Discharge current

Vs = 13.5V,

Vcw = 2.5V

Vcw

Twop Watchdog period

Vs = 13.5V,

Ctw = 47nF

Res

twol Watchdog output low time Vs = 13.5V,

Ctw = 47nF

1.0 2.13 4.5 µA

25 50 90 ms

6 10.5 22 ms

Table 8. Watchdog Enable

Pin Symbol

Parameter

Test condition Min. Typ. Max. Unit

WEn WEn_low Enable input low voltage

WEn WEn_high Enable input high voltage

WEn WEn_hyst Enable input hysteresis

WEn

Ileak Pull down current

WEn = 5V

1

V

3

V

500 800 1100 mV

2 8 20 µA

10/30

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