Datasheet

L4993 Electrical specifications
Doc ID 13517 Rev 8 9/32
Table 6. Reset
Pin Symbol Parameter Test condition Min. Typ. Max. Unit
Res Vres_l Reset output low voltage
R
ext
= 5k to Vo,
Vo > 1V
0.4 V
Res I
Res_h
Reset output high leakage
current
V
Res
= 5V 1 µA
Res R_p_u Pull up internal resistance With respect to Vo 12 25 50 k
Res Vo_th
Vo out of regulation
threshold
Vs = 6 to 31V,
Io = 1 to 150mA
6% 8% 10%
Below
V
o_ref
Vcr Vrlth
Reset delay circuit low
threshold
Vs = 13.5V 10% 13% 16% V
o_ref
Vcr Vrhth
Reset delay circuit high
threshold
Vs =13.5V 44% 47% 50% V
o_ref
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 Reset reaction time
(1)
1. When Vo becomes lower than 4V, the reset reaction time decreases down to 2µs assuring a faster reset
condition in this particular case.
Vo = V
o_th
-100mV 100 275 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% V
o_ref
Vcw Vwlth Low threshold Vs = 13.5V 10% 13% 16% V
o_ref
Vcw Icwc Charge current
Vs = 13.5V,
Vcw = 0.1V
4 8 14 µA