DS1233A-15 ,3.3V EconoResetDS1233A3.3V EconoReset
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DS1233-10-DS1233A-15-DS1233Z-5
5V EconoReset
FEATURESAutomatically restarts microprocessor after
power failureMonitors pushbutton for external overrideInternal circuitry debounces pushbutton
switchMaintains reset for 350 ms after VCC returns
to an in-tolerance condition or pushbutton
releasedAccurate 5%, 10% or 15% microprocessor 5V
power supply monitoringReduces need for discrete componentsPrecision temperature-compensated voltage
reference and voltage sensorLow-cost TO-92 package or surface-mount
SOT-223 packageInternal 5kΩ=pull-up resistorOperating temperature of -40°C to +85°C
PIN ASSIGNMENT
PIN DESCRIPTIONPIN 1GROUND
PIN 2RESETPIN 3VCC
PIN 4GROUND (SOT-223 ONLY)
DESCRIPTIONThe DS1233 EconoReset monitors two vital conditions for a microprocessor: power supply and external
override. A precision temperature compensated reference and comparator circuit are used 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 350 ms to allow the power supply and
processor to stabilize. The second function of the DS1233 is pushbutton reset control. The DS1233
debounces a pushbutton closure and will generate a 350 ms reset pulse upon release.
OPERATION - POWER MONITORThe DS1233 provides the functions of detecting out-of-tolerance power supply conditions and warning aprocessor-based system of impending power failure. When VCC is detected as out-of-tolerance, as
defined by the tolerance of the part selected, the RST signal is asserted. On power-up, RST is kept active
for approximately 350 ms after the power supply has reached the selected tolerance. This allows the
power supply and microprocessor to stabilize before RST is released.
DS1233
5V EconoReset1 2 3
1 2 3
TO-92 PACKAGE
See Mech.
Drawings Section4
SOT-223 PACKAGE
See Mech.
Drawings Section
DS1233
OPERATION - PUSHBUTTON RESETThe DS1233 provides for a pushbutton switch to be connected to the RST output pin. When the DS1233
is not in a reset cycle, it continuously monitors the RST signal for a low going edge. If an edge is
detected, the DS1233 will debounce the switch by pulling the RST line low. After the internal timer has
expired, the DS1233 will continue to monitor the RST line. If the line is still low, the DS1233 willcontinue to monitor the line looking for a rising edge. Upon detecting a release, the DS1233 will force the
RST line low and hold it low for 350 ms.
NOTE:For proper operation with an external pushbutton, a capacitor between 100 pF and 0.01 μF must be
connected between RST and ground. In applications where additional reset current is required, a
minimum capacitance of 500 pF should be used, along with a parallel external pull-up resistor of 1
kΩ=minimum.
BLOCK DIAGRAM Figure 1
APPLICATION EXAMPLE Figure 2
DS1233
PUSHBUTTON RESET Figure 3
POWER UP Figure 4
POWER DOWN Figure 5
DS1233
ABSOLUTE MAXIMUM RATINGS*Voltage on VCC Pin Relative to Ground -0.5V to +7.0V
Voltage on I/O 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; VDD=5V ± 10%)
AC ELECTRICAL CHARACTERISTICS (-40°C to +85°C; VCC=5V ± 10%)
NOTES:1. All voltages are referenced to ground.
DS1233
ECONORESET SELECTION GUIDE
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