Datasheet

Data Sheet 8 Rev. 1.5, 2007-03-20
TLE 4268
Note: The reset output is low in range from V
Q
= 1 V to V
Q,rt
.
Watchdog
Discharge current
I
D,d
1.5 3.5 5.2 µA V
D
= 1.0 V
Charging current
I
D,c
51218µA V
D
= 1.0 V
Upper timing
threshold
V
DU
1.4 1.8 2.2 V –
Lower timing
threshold
V
DWL
0.2 0.4 0.55 V –
Watchdog period
T
WP
30 55 75 ms C
D
= 100 nF
Watchdog trigger time
T
WT
25 40 60 ms C
D
= 100 nF
Activating current
I
Q
2 8 15 mA Activates watchdog
Slew rate d
V
W
/dt5––V/µs from 20% up to
80%
V
Q
2)
1) Drop voltage = V
I
- V
Q
(measured when the output voltage has dropped 100 mV from the nominal value
obtained at 13.5 V input)
2) Watchdog pulse recognition tested with 10 kHz max. pulse frequency
Table 5 Characteristics (cont’d)
V
I
= 13.5 V; -40 °C ≤ T
j
≤ 125 °C (unless otherwise specified)
Parameter Symbol Limit Values Unit Test Condition
Min. Typ. Max.