MAX821

ABSOLUTE MAXIMUM RATINGS
Terminal Voltage (with respect to GND)
Vcc ......................................................................-0.3V to 6.0V
All Other Inputs.......................................-0.3V to (VCC + 0.3V)
Input Current, Vcc, SRT..................................................20mA
Output Current, RESET or RESET.....................................20mA.
Continuous Power Dissipation (TA = +70°C)
SOT143-4 (derate 4mW/°C above +70°C)...................320mW
Operating Temperature Range .....................-40°C to +125°C
Storage Temperature Range .........................-65°C to +160°C
Lead Temperature (soldering, 10sec) ...........................+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  onditions for extended periods may affect device reliability.

The MAX821/MAX822 microprocessor (P) supervisory circuits monitor power supplies in P and digital systems. They provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with 5V-powered or 3V-powered circuits. The MAX821/MAX822 also provide a power-on reset timeout delay that is pin selectable to 1ms (max), 20ms (min), or 100ms (min).

These MAX821 perform a single function: they assert a reset signal whenever the Vcc supply voltage falls below a preset threshold, and they keep reset asserted for the pin-selected reset timeout delay after Vcc has risen above the reset threshold. The only difference between the two devices is that the MAX821 has an active-low RESET output (which is guaranteed to be in the correct state for Vcc down to 1V), while the MAX822 has an active-high RESET output. The reset comparator MAX821 is designed to ignore fast transients on Vcc. Reset thresholds suitable for operation with a variety of supply voltages are available.

Low supply current makes the MAX821/MAX822 ideal for use in portable equipment. These devices come in a 4-pin SOT143 package.