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L4979D Datasheet(PDF) 9 Page - STMicroelectronics |
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L4979D Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 22 page L4979D, L4979MD Electrical specifications Doc ID 10262 Rev 9 9/22 Res R_p_u Internal pull-up resistance With respect to Vo 12 25 50 k Res Vo_th Reset threshold voltage Vs = 5.6 to 31 V Io = 1 to 150 mA 6% below Vo_ref 8% below Vo_ref 10% below Vo_ref Vcr Vrhth Reset timing high threshold Vs = 13.5 V 44% Vo_ref 47% Vo_ref 50% Vo_ref Vcr Vrlth Reset timing low threshold Vs = 13.5 V 10% Vo_ref 13% Vo_ref 16% Vo_ref Vcr Icr Charge current Vs = 13.5 V 8 17 30 µA Vcr Idr Discharge current Vs = 13.5 V 8 17 30 µA Res trr_2 Reset delay time(1) Vo =Vo_th - 100 mV 100 250 700 µs Res trd Reset pulse delay Vs = 13.5 V; Ctr = 1 nF 65 150 ms 1. When Vo becomes lower than 4 V, the reset reaction time decreases down to 2 µs assuring a faster reset condition in this particular case. Table 8. Watchdog Pin Symbol Parameter Test condition Min. Typ. Max. Unit Wi Vih Input high voltage Vs = 13.5 V 3.5 V Wi Vil Input low voltage Vs = 13.5 V 1.5 V Wi Vih Input hysteresis Vs = 13.5 V 300 mV Wi Ii Pull down current Vs = 13.5 V 10 20 µA Vcw Vwhth High threshold Vs = 13.5 V 2.20 2.35 2.50 V Vcw Vwlth Low threshold Vs = 13.5 V 0.50 0.65 0.80 V Vcw Icwc Charge current Vs = 13.5 V; Vcw = 0.1 V 4 7.5 14 µA Vcw Icwd Discharge current Vs = 13.5 V; Vcw = 2.5 V 1.0 2.4 4.5 µA Vcw Twop Watchdog period Vs = 13.5 V; Ctw =47nF 25 50 90 ms Res twol Watchdog output low time Vs = 13.5 V; Ctw =47nF 6 10 22 ms Table 9. Enable Pin Symbol Parameter Test condition Min. Typ. Max. Unit En Ven_l Enable input low voltage 1 V En Ven_h Enable input high voltage 3 V En Ven_hy Enable input hysteresis 700 1000 1100 mV En I_leak Pull down current En = 5 V 2 10 20 µA Table 7. Reset (continued) Pin Symbol Parameter Test condition Min. Typ. Max. Unit |
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