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DS1818 Schematic ( PDF Datasheet ) - Dallas Semiconductor

Teilenummer DS1818
Beschreibung 3.3V EconoReset
Hersteller Dallas Semiconductor
Logo Dallas Semiconductor Logo 




Gesamt 5 Seiten
DS1818 Datasheet, Funktion
www.DataSheet4U.com
www.dalsemi.com
DS1818
3.3V EconoReset with Pushbutton
FEATURES
Automatically restarts a microprocessor after
power failure
Monitors pushbutton for external override
Maintains reset for 150 ms after VCC returns
to an in-tolerance condition
Reduces need for discrete components
Precision temperature-compensated voltage
reference and voltage sensor
Accurate 5%, 10% or 20% power monitoring
Low-cost TO-92 or space saving surface
mount SOT-23 packages available
Efficient open-drain output with internal
5.5 k=pull-up resistor
Operating temperature -40°C to +85°C
PIN ASSIGNMENT
3
12
SOT-23 PACKAGE
123
123
TO-92 PACKAGE
See Mech.
Drawings Section
PIN DESCRIPTION
TO-92
1 RST
2 VCC
3 GND
Active Low Reset Output
Power Supply
Ground
SOT-23
1 RST
2 VCC
3 GND
Active Low Reset Output
Power Supply
Ground
DESCRIPTION
The DS1818 EconoReset uses a precision temperature-compensated reference and comparator circuit to
monitor the status of the power supply (VCC). When an out-of-tolerance condition is detected, an internal
power-fail signal is generated which forces reset to the active state. When VCC returns to an in-tolerance
condition, the reset signal is kept in the active state for approximately 150 ms to allow the power supply
and processor to stabilize.
The DS1818 also monitors a pushbutton on the reset output. If the reset line is pulled low, a reset is
generated upon release and the DS1818 output will be held in reset output low for typically 150 ms.
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