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DS1812-10-DS1812-5
5V EconoReset with Active High Push-Pull Output
FEATURESAutomatically restarts a microprocessor after
power failureMaintains reset for 150 ms after VCC returnsto an in-tolerance conditionReduces need for discrete componentsPrecision temperature-compensated voltage
reference and voltage sensorLow-cost TO-92, or space saving surfacemount SOT-23 packages availablePush-pull active high outputOperating temperature -40°C to +85°C
PIN ASSIGNMENT
PIN DESCRIPTION
TO-921 RST Active High Reset Output
2 VCC Power Supply
3 GND Ground
SOT-23RST Active High Reset Output
2 VCC Power Supply3 GND Ground
DESCRIPTIONThe DS1812 EconoReset uses a precision temperature 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.
DS1812
5V EconoReset with Active
High Push-Pull OutputSOT-23 PACKAGE
See Mech. Drawing
1 2 3
1 2 3
TO-92 PACKAGE
See Mech.
Drawings
DS1812
OPERATION - POWER MONITORThe DS1812 provides the function of detecting out-of-tolerance power supply conditions and warning a
processor-based system of impending power failure. When VCC is detected as out-of-tolerance, the RST
signal is asserted. On power-up, RST is kept active for approximately 150 ms after the power supply has
reached the selected tolerance. This allows the power supply and microprocessor to stabilize before RST
is released.
BLOCK DIAGRAM (CMOS OUTPUT) Figure 1
APPLICATION EXAMPLE Figure 2
DS1812
TIMING DIAGRAM: POWER-UP Figure 3
TIMING DIAGRAM: POWER-DOWN Figure 4
DS1812
ABSOLUTE MAXIMUM RATINGS*Voltage on VCC Pin Relative to Ground -0.5V to +7.0V
Voltage on RST Relative to Ground -0.5V to VCC +0.5V
Operating Temperature -40°C to +85°C
Storage Temperature -55°C to +125°C
Soldering Temperature 260°C for 10 secondsThis is a stress rating only and functional operation of the device at these or any other conditionsabove those indicated in the operation sections of this specification is not implied. Exposure to
absolute maximum rating conditions for extended periods of time may affect reliability.
RECOMMENDED DC OPERATING CONDITIONS (-40°C to +85°C)
DC ELECTRICAL CHARACTERISTICS (-40°C to +85°C; VCC=1.2V to 5.5V)
AC ELECTRICAL CHARACTERISTICS (-40°C to +85°C; VCC=1.2V to 5.5V)
DS1812
NOTES:1. All voltages are referenced to ground.
2. Measured with VCC ≥ 2.7 volts.
3. Measured with RST output open.
4. tR = 5 μs.
PART MARKING CODES“A”, “B”, &“C” represent the device type.
810 - DS1810
811 - DS1811
812 - DS1812813 - DS1813
815 - DS1815
816 - DS1816
817 - DS1817
818 - DS1818
“D” represents the device tolerance.
A -5%
B -10%
C -15%D -20%
SOT-23 PACKAGE
This datasheet has been :
www.ic-phoenix.com
Datasheets for electronic components.
