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The MAX803/MAX809/MAX810 are microprocessor (P) upervisory circuits used to monitor the power supplies n P and digital systems. They provide excellent circuit eliability and low cost by eliminating external components nd adjustments when used with +5V, +3.3V, 3.0V, or +2.5V powered circuits.
These circuits perform a single function: they assert a eset signal whenever the VCC supply voltage declines elow a preset threshold, keeping it asserted for at east 140ms after VCC has risen above the reset threshold.
Reset thresholds suitable for operation with a variety f supply voltages are available.
The MAX803 has an open-drain output stage, while the AX809/MAX810 have push-pull outputs. The AX803's open-drain RESET output requires a pull-up esistor that can be connected to a voltage higher than CC. The MAX803/MAX809 have an active-low RESEToutput, while the MAX810 has an active-high RESET utput. The reset comparator is designed to ignore fast ransients on VCC, and the outputs are guaranteed to e in the correct logic state for VCC down to 1V.
Low supply current makes the MAX803/MAX809/ AX810 ideal for use in portable equipment. The AX803 is available in a 3-pin SC70 package, and the AX809/MAX810 are available in 3-pin SC70 or SOT23 ackages.
MAX810T Maximum Ratings
Terminal 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) 3-Pin SC70 (derate 2.17mW/ above +70).............174mW 3-Pin SOT23 (derate 4mW/ above +70)................320mW Operating Temperature Range 3-Pin SC70.....................................................-40 to +125 3-Pin SOT23...................................................-40 to +105 Storage Temperature Range ..........................65 to +150 Lead Temperature (soldering, 10s) .............................+300
MAX810T Features
` Precision Monitoring of +2.5V, +3V, +3.3V, and 5V Power-Supply Voltages ` Fully Specified Over Temperature ` Available in Three Output Configurations pen-Drain RESET Output (MAX803) ush-Pull RESET Output (MAX809) ush-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 Packages
MAX810T Typical Application
`Computers `Controllers `Intelligent Instruments `Critical P and C Power Monitoring `Portable/Battery-Powered Equipment `Automotive