DS1818-10 ,3.3V EconoReset with PushbuttonPIN DESCRIPTIONTO-921 RST Active Low Reset Output2 V Power SupplyCC3 GND GroundSOT-231 RST Active L ..
DS1818-10 ,3.3V EconoReset with PushbuttonFEATURES PIN ASSIGNMENT Automatically restarts a microprocessor after3power failure Monitors push ..
DS1818-5+ ,3.3V EconoReset with PushbuttonFEATURES PIN ASSIGNMENT • Improves Reliability of Processor Operation 3 o Temperature-Compensat ..
DS1818R-10/T&R ,3.3V EconoReset with PushbuttonPIN DESCRIPTION o Fixed 3.3V Reset Threshold TO-92 o 5%, 10%, and 20% Tolerance Versions 1 RS ..
DS1818R-10+T&R ,3.3V EconoReset with PushbuttonFEATURES PIN ASSIGNMENT • Improves Reliability of Processor Operation 3 o Temperature-Compensat ..
DS1818R-10-U+ ,3.3V EconoReset with PushbuttonDS1818 3.3V EconoReset with Pushbutton BENEFITS AND
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DS1818-10
3.3V EconoReset with Pushbutton
FEATURESAutomatically restarts a microprocessor after
power failureMonitors pushbutton for external overrideMaintains reset for 150 ms after VCC returns
to 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 availableEfficient open-drain output with internal
5.5 kΩ=pull-up resistorOperating temperature -40°C to +85°C
PIN ASSIGNMENT
PIN DESCRIPTION
TO-92RSTActive Low Reset Output
2 VCC Power Supply3 GND Ground
SOT-23RSTActive Low Reset Output
2 VCC Power Supply
3 GND Ground
DESCRIPTIONThe 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 internalpower-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.
DS1818
3.3V EconoReset with PushbuttonSOT-23 PACKAGE
1 2 3
1 2 3
TO-92 PACKAGE
See Mech.
Drawings Section
DS1818
OPERATION - POWER MONITORThe DS1818 provides the functions of detecting out-of-tolerance power supply conditions and warning a
processor-based system of impending power failures. 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 (OPEN-DRAIN OUTPUT) Figure 1
APPLICATION EXAMPLE Figure 2
OPERATION - PUSHBUTTON RESETThe DS1818 provides a pushbutton switch for manual reset control. When the DS1818 is not in a reset
cycle, a pushbutton reset can be generated by pulling the RST pin low for at least 1 μs. When the
pushbutton is held low, the RST is forced active low and will remain active low for about 150 ms afterthe pushbutton is released. See Figure 2 for an application example and Figure 3 for the timing diagram.
TIMING DIAGRAM: PUSHBUTTON RESET Figure 3
DS1818
TIMING DIAGRAM: POWER-UP Figure 4
TIMING DIAGRAM: POWER-DOWN Figure 5
DS1818
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)
DS1818
NOTES:1. All voltages are referenced to ground.
2. Measured with VCC ≥ 2.7V.
3. A 1 kΩ external pull-up resistor may be required in some applications for proper operation of the
microprocessor reset control circuit.
4. Measured with RST output open.
5. Measured with 2.7V ≤ VCC ≤ 3.3V.
6. tR = 5 μs.
7. VOH and IOH are a function of the value of RP and the associated output load conditions.
8. 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-DS1812813-DS1813
815-DS1815
816-DS1816
817-DS1817
818-DS1818
“D” represents the device tolerance.5%-10%-15%D-20%
This datasheet has been :
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