DS1813-10 ,5V EconoReset with PushbuttonDS18135V EconoReset with Pushbuttonwww.dalsemi.com
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DS1813-10-DS1813-15
5V EconoReset with Pushbutton
FEATURESAutomatically restarts a microprocessor after
power failureMonitors pushbutton for external overrideMaintains reset for typically 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 availableEfficient open-drain output with internal
5.5 kΩ=pull-up resistorOperating 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 DS1813 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.
The DS1813 also monitors a pushbutton on the reset output. If the reset line is pulled low, a reset isgenerated upon release and will be held in reset output low for typically 150 ms.
DS1813
5V EconoReset with PushbuttonSOT-23 PACKAGE
1 2 3
1 2 3
TO-92 PACKAGE
See Mech.
Drawings Section
DS1813
OPERATION - POWER MONITORThe DS1813 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 μs after the power supply has
reached the selected tolerance. This allows the power supply and microprocessor to stabilize before RST
is released.
OPERATION - PUSHBUTTON RESETThe DS1813 provides for a pushbutton switch for manual reset control. When the DS1813 is not in a reset
cycle, a pushbutton reset can be generated by pulling the RST pin low for at least 1 ms. When the
pushbutton is held low, the RESET is forced active low and will remain active low for about 150 ms after
the pushbutton is released. See Figure 2 for an application example and Figure 3 for the timing diagram.
BLOCK DIAGRAM (OPEN-DRAIN OUTPUT) Figure 1
APPLICATION EXAMPLE Figure 2
DS1813
TIMING DIAGRAM: PUSHBUTTON RESET Figure 3
TIMING DIAGRAM: POWER-UP Figure 4
TIMING DIAGRAM: POWER-DOWN Figure 5
DS1813
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)
DS1813
NOTES:1. All voltages are referenced to ground.
2. Measured with VCC ≥ 2.7 volts.
3. A 1kΩ=external resistor may be required in some applications for proper operation of the
microprocessor reset control circuit.
4. Measured with RST output open.
5. tR = 5 μs.
6. VOH and IOH are a function of the value of RP and the associated output load conditions.
7. This 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 . . . . DS1810811 . . . . DS1811
812 . . . . DS1812
813 . . . . DS1813
815 . . . . DS1815
816 . . . . DS1816817 . . . . DS1817
818 . . . . DS1818
“D” represents the device tolerance.
A . . . . . . 5%B . . . . . . 10%
C . . . . . . 15%
D . . . . . . 20%
This datasheet has been :
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