DS1815-10 ,3.3V EconoReset with Push-Pull OutputPIN DESCRIPTIONTO-921 RST Active Low Reset Output2 V Power SupplyCC3 GND GroundSOT-231 RST Active L ..
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DS1816 ,3.3V EconoReset with Open Drain OutputPIN DESCRIPTIONTO-921 RST Active Low Reset Output2 V Power SupplyCC3 GND GroundSOT-231 RST Active L ..
DS1816R-10/T&R ,3.3V EconoReset with Open Drain OutputDS18163.3V EconoReset withOpen Drain Output
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DS1816R-20/T&R ,3.3V EconoReset with Open Drain OutputPIN DESCRIPTIONTO-921 RST Active Low Reset Output2 V Power SupplyCC3 GND GroundSOT-231 RST Active L ..
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DS1815-10
3.3V EconoReset with 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 sensorAccurate 5%, 10% or 20% power monitoringLow-cost TO-92 or space saving surface-
mount SOT-23 packages availablePush-pull output for low current operationOperating temperature -40°C to +85°C
PIN ASSIGNMENT
PIN DESCRIPTION
TO-92RST Active Low Reset Output
2 VCC Power Supply3 GND Ground
SOT-23RST Active Low Reset Output
2 VCC Power Supply
3 GND Ground
DESCRIPTIONThe DS1815 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-failsignal 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.
DS1815
3.3V EconoReset with Push-Pull OutputSOT-23 PACKAGE
1 2 3
1 2 3
TO-92 PACKAGE
See Mech.
Drawings Section
DS1815
OPERATION - POWER MONITORThe DS1815 provides the functions 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
APPLICATION DIAGRAM:
RST VALID TO 0 VOLTS V
CC ON THE DS1815 Figure 3
DS1815
TIMING DIAGRAM: POWER-UP Figure 4
TIMING DIAGRAM: POWER-DOWN Figure 5
DS1815
ABSOLUTE MAXIMUM RATINGS*
Voltage on VCC Pin Relative to Ground -0.5V to +7.0V
Voltage on RST Relative to Ground -0.5V to +5VCC +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 toabsolute 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)
DS1815
NOTES:
1. All voltages are referenced to ground.
2. Measured with VCC ≥ 2.7V.
3. Measured with RST output open.
4. Measured with 2.7V ≤ VCC ≤ 3.3V.
5. tR = 5 μs.
6. The tF value is for reference in defining values for TRPD and should not be considered a requirement
for proper operation or use of the device.
PART MARKING CODES
“A”, “B”, &“C” represent the device type.
810 . . . . DS1810
811 . . . . DS1811
812 . . . . DS1812
813 . . . . DS1813815 . . . . DS1815
816 . . . . DS1816
817 . . . . DS1817
818 . . . . DS1818
“D” represents the device tolerance.
A . . . . . . 5%
B . . . . . . 10%
C . . . . . . 15%
D . . . . . . 20%
This datasheet has been :
www.ic-phoenix.com
Datasheets for electronic components.
