Features: ` Precision Monitoring of +2.5V, +3V, +3.3V, and +5V Power-Supply Voltages
` Fully Specified Over Temperature
` Available in Three Output Configurations
Open-Drain RESET Output (MAX803)
Push-Pull RESET Output (MAX809)
Push-Pull RESET Output (MAX810)
` 140ms min Power-On Reset Pulse Width
` 12A Supply Current
` Guaranteed Reset Valid to VCC = +1V
` Power Supply Transient Immunity
` No External Components
` 3-Pin SC70 and SOT23 PackagesApplication`Computers
`Controllers
`Intelligent Instruments
`Critical P and C Power Monitoring
`Portable/Battery-Powered Equipment
`AutomotivePinout
SpecificationsTerminal Voltage (with respect to GND)
VCC....................................................................-0.3V to +6.0V
RESET, RESET(push-pull) .....................-0.3V to (VCC + 0.3V)
RESET (open drain)...........................................-0.3V to +6.0V
Input Current, VCC ..............................................................20mA
Output Current, RESET, RESET..........................................20mA
Rate of Rise, VCC ............................................................100V/s
Continuous Power Dissipation (TA = +70°C)
3-Pin SC70 (derate 2.17mW/°C above +70°C)............174mW
3-Pin SOT23 (derate 4mW/°C above +70°C)...............320mW
Operating Temperature Range .........................-40°C to +105°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
DescriptionThe MAX803T are microprocessor (P) supervisory circuits used to monitor the power supplies in P and digital systems. MAX803T provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with +5V, +3.3V,+3.0V, or +2.5V-powered circuits.
These circuits MAX803T perform a single function: they assert a reset signal whenever the VCC supply voltage declines below a preset threshold, keeping it asserted for at least 140ms after VCC has risen above the reset threshold.Reset thresholds suitable for operation with a variety of supply voltages are available.
The MAX803T has an open-drain output stage, while the MAX809/MAX810 have push-pull outputs. The MAX803T's open-drain RESEToutput requires a pull-up resistor that can be connected to a voltage higher than VCC. The MAX803T have an active-low RESET output, while the MAX810 has an active-high RESET output. The reset comparator is designed to ignore fast transients on VCC, and the outputs are guaranteed to be in the correct logic state for VCC down to 1V.
Low supply current makes the MAX803T ideal for use in portable equipment. The MAX803T is available in a 3-pin SC70 package, and the MAX809/MAX810 are available in 3-pin SC70 or SOT23 packages.
MAX803T Data Sheet
