L4993

Electrical specifications

9/30

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

R_p_u

Pull up internal resistance

With respect to Vo

12

25

50

k

Ω

Res

Vo_th

Vo out of regulation

threshold

Vs = 6 to 31V,

Io = 1 to 150mA

6%

8%

10%

Below

Vcr

Vrlth

Reset delay circuit low

threshold

Vs = 13.5V

10%

13%

16%

Vcr

Vrhth

Reset delay circuit high

threshold

Vs =13.5V

44%

47%

50%

Vcr

Icr

Charge current

Vs = 13.5V

8

17.6

30

µA

Vcr

Idr

Discharge current

Vs = 13.5V

8

17.6

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.

275

1000

µs

Res

Trd

Reset delay time

Vs = 13.5V,

Ctr = 1nF

65

150

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_hyst

Input hysteresis

Vs = 13.5V

500

mV

Wi

Ii

Pull down current

Vs = 13.5V

10

20

µA

Vcw

Vwhth

High threshold

Vs = 13.5V

44%

47%

50%

Vcw

Vwlth

Low threshold

Vs = 13.5V

10%

13%

16%

Vcw

Icwc

Charge current

Vs = 13.5V,

Vcw = 0.1V

4

8

14

µA