Obsolete

Product(s)

- Obsolete

Product(s)

L4989

Electrical specifications

9/19

Table 6.

Reset

Pin

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

Res

Vres_l

Reset output low voltage

Vo > 1V

0.4

V

Res

Reset output high leakage

current

1

µA

Res

Pull up internal resistance

Versus Vo

10

20

40

k

Ω

Res

Vo_th

Reset threshold voltage

Vs = 5.6 to 31V,

Io = 1 to 150mA

6%

8%

10%

Below

Vcr

Vrlth

Reset timing low threshold

Vs = 13.5V

10%

13%

Vcr

Vrhth

Reset timing high threshold Vs =13.5V

44%

47%

Vcr

Icr

Charge current

Vs = 13.5V

8

15

30

µA

Vcr

Idr

Discharge current

Vs = 13.5V

8

15

30

µA

Res

Trr_2

1.

When Vo becomes lower than 4V, the reset reaction time decreases down to 2µs assuring a faster reset

condition in this particular case.

100

250

700

µs

Res

Trd

Reset delay time

Vs = 13.5V,

Ctr = 1nF

65

115

165

ms

Table 7.

Watchdog

Pin

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

Wi

Vih

Input high voltage

Vs = 13.5V

3.5

V

Wi

Vil

Input low voltage

Vs = 13.5V

1.5

V

Wi

Vih

Input hysteresis

Vs = 13.5V

500

mV

Wi

Rwi

Pull down resistor

Vs = 13.5V

30

100

250

K

Ω

Vcw

Vwhth

High threshold

Vs = 13.5V

44%

47%

Vcw

Vwlth

Low threshold

Vs = 13.5V

10%

13%

Vcw

Icwc

Charge current

Vs = 13.5V,

Vcw = 0.1V

510

20

µA

Vcw

Icwd

Discharge current

Vs = 13.5V,

Vcw = 2.5V

1.25

2.5

5

µA

Vcw

Twop

Watchdog period

Vs = 13.5V,

Ctw = 47nF

20

40

80

ms

Res

twol

Watchdog output low time

Vs = 13.5V,

Ctw = 47nF

48

16

ms