L4993 데이터 시트보기 (PDF) - STMicroelectronics
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L4993 Datasheet PDF : 30 Pages
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L4993
Electrical specifications
Table 6. Reset
Pin Symbol
Parameter
Test condition Min. Typ. Max. Unit
Res
Vres_l Reset output low voltage Rext = 5kΩ to Vo,
Vo > 1V
Res
IRes_h
Reset output high leakage
current
VRes = 5V
0.4
V
1
µA
Res
R_p_u Pull up internal resistance With respect to Vo 12 25 50
kΩ
Res
Vo_th
Vo out of regulation
threshold
Vs = 6 to 31V,
Io = 1 to 150mA
6%
8%
10%
Below
Vo_ref
Vcr
Vrlth
Reset delay circuit low
threshold
Vs = 13.5V
10% 13% 16% Vo_ref
Vcr
Vrhth
Reset delay circuit high
threshold
Vs =13.5V
44% 47% 50% Vo_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)
Vo = Vo_th -100mV 100 275 1000 µs
Res
Trd Reset delay time
Vs = 13.5V,
65
Ctr = 1nF
150 ms
1. When Vo becomes lower than 4V, the reset reaction time decreases down to 2µs assuring a faster reset
condition in this particular case.
Table 7. Watchdog
Pin Symbol
Parameter
Wi
Vih Input high voltage
Wi
Vil Input low voltage
Wi Vih_hyst Input hysteresis
Wi
Ii
Pull down current
Vcw
Vwhth High threshold
Vcw
Vwlth Low threshold
Vcw
Icwc Charge current
Test condition Min. Typ. Max. Unit
Vs = 13.5V
3.5
V
Vs = 13.5V
1.5
V
Vs = 13.5V
500
mV
Vs = 13.5V
10 20 µA
Vs = 13.5V
Vs = 13.5V
Vs = 13.5V,
Vcw = 0.1V
44% 47% 50% Vo_ref
10% 13% 16% Vo_ref
4 8 14 µA
9/30
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