Low-Power, SC70/SOT µP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay

The MAX6340/MAX6421–MAX6426 low-power microprocessor supervisor circuits monitor system voltages from 1.6V to 5V. These devices perform a single function: they assert a reset signal whenever the VCC supply voltage falls below its reset threshold. The reset output remains asserted for the reset timeout period after VCC rises above the reset threshold. The reset timeout is externally set by a capacitor to provide more flexibility.

The MAX6421/MAX6424 have an active-low, push-pull reset output. The MAX6422 has an active-high, push-pull reset output and the MAX6340/MAX6423/MAX6425/MAX6426 have an active-low, open-drain reset output. The MAX6421/MAX6422/MAX6423 are offered in 4-pin SC70 or SOT143 packages. The MAX6340/MAX6424/MAX6425/MAX6426 are available in 5-pin SOT23-5 packages.

Applications

* Automotive * Battery-Powered Computers/Controllers * Computers * Critical µP Monitoring * Embedded Controllers * Intelligent Instruments * Medical Equipment * Portable Equipment * Set-Top Boxes

* Monitor System Voltages from 1.6V to 5V

* Capacitor-Adjustable Reset Timeout Period

* Low Quiescent Current (1.6µA typ)

* Three RESET Output Options

* Push-Pull Active-Low RESET

* Push-Pull RESET

* Open-Drain Active-Low RESET

* Guaranteed Reset Valid to VCC = 1V