MAX6366LKA46

Overview

The MAX6366LKA46 is a low-power microprocessor supervisory circuit manufactured by Analog Devices Inc. (Maxim Integrated). It operates within a supply voltage range of 1.2V to 5.5V and features a fixed reset threshold voltage of 4.63V with an overvoltage threshold of 4.75V. The device provides an active-low, open-drain output and includes a built-in watchdog timer with a typical timeout period of 1.28 seconds. It incorporates a battery backup switch for seamless power transition and a chip-enable input for power-down control. The component is housed in an SOT-23-8 package and supports operation across a temperature range of -40°C to +85°C.

Feature Summary

• Integrates a watchdog timer with automatic timeout reset functionality to monitor processor activity.
• Includes a battery backup switch that automatically connects an external battery when the main supply drops below the threshold.
• Features a chip-enable input pin that allows the device to be disabled during low-power sleep modes.
• Provides an active-low open-drain reset output compatible with various logic families.

Applications

• Portable electronic devices requiring extended battery life through low quiescent current operation.
• Embedded systems utilizing microcontrollers that require automated watchdog supervision.
• Battery-powered equipment needing reliable power-fail detection and backup switching.
• Industrial control modules operating within standard commercial temperature ranges.

Procurement Notes

Verify the specific suffix 'L' against official datasheets to confirm parameter alignment, as variations exist within the family. Confirm availability status directly with authorized distributors due to potential lifecycle changes. Ensure the SOT-23-8 footprint matches the target PCB design. Cross-reference the 4.63V threshold requirement with system voltage rails to prevent false triggering.

Selection Notes

Select this component when a fixed 4.63V threshold is required for system monitoring. The integrated watchdog timer eliminates the need for external timing components. The open-drain output requires an external pull-up resistor; ensure the selected resistor value suits the system voltage. Verify that the chip-enable feature is utilized or left unconnected according to the application's power management strategy.

Part Context

This part belongs to the MAX6366P/L series of low-power uP supervisory circuits. It shares functional similarities with the MAX6365 and MAX6368 but differs in output type and manual reset capabilities. The MAX6366 specifically offers an open-drain output without a manual reset pin, distinguishing it from push-pull variants in the same voltage class.

Replacement Considerations

The MAX6366PKA46+T is a direct functional substitute within the same series offering identical electrical characteristics. The MAX6366HKA46+T serves as another alternative in the lineup. Verify package compatibility and threshold voltage specifications before substituting with other supervisory ICs.