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OPERATING DC SUPPLY VOLTAGE RANGE
5.6V TO 31V
VERY LOW QUIESCENT CURRENT WITH
WATCHDOG DISABLED
PRECISION OUTPUT VOLTAGE (3%)
LOW-DROP VOLTAGE
(180mV typ at I
o
= 150mA)
RESET CIRCUIT SENSING THE OUTPUT
VOLTAGE DOWN TO 1V
PROGRAMMABLE RESET DELAY WITH
EXTERNAL CAPACITOR
WATCHDOG DISABLE INPUT
PROGRAMMABLE WATCHDOG TIMER WITH
EXTERNAL CAPACITOR
THERMAL SHUTDOWN AND SHORT
CIRCUIT PROTECTION
WIDE TEMPERATURE RANGE (T
j
= -40擄C TO
150擄C)
SO8
SO20
ORDERING NUMBERS:
L4989D (SO8)
L4989 (SO20)
BLOCK DIAGRAMt
Vs
Vi
Vo
Co
Start up
1.25V
Voltage
Reference
Wi
Vcw
Ctw
WE
watchdog
gnd
100mV
+
_
Res
Vcr
Ctr
Reset
March 2004
This is preliminary information on a new product now in development. Details are subject to change without notice.
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