MAX6345ZUT+

Overview

The MAX6345ZUT+ is a supervisory circuit manufactured by Analog Devices Inc./Maxim Integrated. It functions as a reset generator with an integrated power-fail comparator, housed in a compact SOT-23-5 surface-mount package. The device operates within a supply voltage range of 1.2V to 5.5V and supports a wide temperature range from -40°C to +85°C. Key electrical specifications include a typical reset delay time of 200ms and a power-fail threshold accuracy of ±1%. The component is RoHS compliant and lead-free, designed for reliable monitoring in low-power embedded systems.

Feature Summary

• Integrates a precise power-fail comparator alongside the reset function for comprehensive voltage supervision.
• Provides manual reset capability via an active-low input pin for system control flexibility.
• Features a watchdog timer with timeout detection to prevent software lockups.
• Supports multiple output configurations including open-drain and push-pull drivers.

Applications

• Portable electronic devices requiring battery level monitoring
• Embedded microcontroller systems needing brown-out protection
• Industrial control units operating in harsh thermal environments

Procurement Notes

Verify the specific suffix 'Z' indicates lead-free compliance against current manufacturer standards. Confirm the 'U' package designation matches the required SOT-23-5 footprint for PCB layout compatibility. Check for any recent product change notices (PCN) that may affect material composition or manufacturing location. Ensure the selected distributor provides valid traceability documentation for quality assurance purposes.

Selection Notes

Select this component when a combined power-fail monitor and reset generator is required in a minimal footprint. Consider the fixed reset delay time if precise timing synchronization with other system components is critical. Evaluate the manual reset input requirement against the system's control logic needs. Verify that the operating voltage range aligns with the target application's supply rails.

Part Context

This part belongs to the MAX6345 series of supervisory circuits, which are designed for single-supply microprocessor systems. The series offers various options for reset delay times and output types. The ZUT variant specifically denotes the lead-free, tape-and-reel packaged version in the small SOT-23-5 outline, suitable for high-volume automated assembly processes.

Replacement Considerations

Consult official datasheets for direct pin-compatible alternatives within the same family. Verify functional equivalence regarding reset thresholds and delay times before substitution.

FAQ

What is the purpose of the manual reset input?

The manual reset input allows external signals to force the reset output low, enabling system initialization or recovery from fault conditions independent of voltage levels.

How does the power-fail comparator differ from the reset function?

The power-fail comparator monitors the supply voltage and asserts a signal when it drops below a specific threshold, whereas the reset function generates a pulse after a defined delay following a power-up event.