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DS1812-5+-DS1812R-5/T&R-DS1812R-5-U+
5V EconoReset with Active High Push-Pull Output
FEATURESAutomatically restarts a microprocessor after
power failureMaintains reset for 150 ms after VCC returns
to an in-tolerance conditionReduces need for discrete componentsPrecision temperature-compensated voltage
reference and voltage sensorLow-cost TO-92, or space saving surface
mount SOT-23 packages availablePush-pull active high outputOperating temperature -40C to +85C
PIN ASSIGNMENT
PIN DESCRIPTION
TO-92RST Active High Reset Output
2 VCC Power Supply
3 GND Ground
SOT-23RST Active High Reset Output
2 VCC Power Supply
3 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 Output
TOP VIEW
SOT-23 PACKAGE
See Mech.
Drawings Section
On Website1 2 3
1 2 3
BOTTOM VIEW
TO-92 PACKAGE
See Mech.
Drawings Section
On Website
DALLAS
DS1812
Econo
Reset
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 conditions
above 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 (-40C to +85C)
PARAMETERSYMBOLMINTYPMAXUNITSNOTESSupply VoltageVCC0.05.5V1
DC ELECTRICAL CHARACTERISTICS (-40C to +85C; VCC=1.2V to 5.5V)
PARAMETERSYMBOLMINTYPMAXUNITSNOTESOutput Voltage @ 0-500 AVOHVCC
-0.5V
VCC
-0.1V
Output Current @ 2.4 voltsIOH350A2
Output Current @ 0.4 voltsIOL+10mA2
Operating Current VCC < 5.5ICC3040A3
VCC Trip Point (DS1812-5)VCCTP4.504.624.75V1
VCC Trip Point (DS1812-10)VCCTP4.254.354.49V1
VCC Trip Point (DS1812-15)VCCTP4.004.134.24V1
Output CapacitanceCOUT10pF
AC ELECTRICAL CHARACTERISTICS (-40C to +85C; VCC=1.2V to 5.5V)
PARAMETERSYMBOLMINTYPMAXUNITSNOTESRESET Active TimetRST100150300ms
VCC Detect to RSTtRPD25s
VCC Slew Rate
(VCCTP (MAX) to VCCTP (MIN))300s
VCC Slew Rate
(VCCTP (MIN) to VCCTP (MAX))0ns
VCC Detect to RSTtRPU100150300ms4
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 s.
PART MARKING CODES“A”, “B”, &“C” represent the device type.
810 - DS1810
811 - DS1811
812 - DS1812
813 - 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.
