MAX6338DUB

Overview

The MAX6338DUB+ is a quad voltage monitor supervisory circuit manufactured by Analog Devices Inc. (Maxim Integrated). It monitors up to four power supplies without external components, featuring factory-trimmed threshold voltages of 1.8V, 3.3V, and 5V alongside an adjustable input option. The device operates within a supply voltage range of +2.5V to +5.5V and draws a typical supply current of 35µA. It provides four independent open-drain active-low outputs with a reset timeout of less than 1ms. Accuracy is guaranteed at 2.5% over the operating temperature range of -40°C to +85°C. The component is housed in a compact 10-pin µMAX package.

Feature Summary

• Monitors four distinct voltage rails simultaneously using internal comparators without requiring external support components
• Provides four independent open-drain active-low output signals for system reset or status indication
• Offers flexible monitoring capabilities including fixed factory-trimmed thresholds and a high-impedance user-adjustable input

Applications

• Telecommunications equipment power supervision
• Desktop and notebook computer motherboard monitoring
• Data storage controller voltage tracking
• Industrial control system power integrity verification

Procurement Notes

Verify the specific suffix designation carefully during procurement, as variations such as C, D, B, and O indicate different factory-programmed threshold combinations. Confirm RoHS compliance status and lead times directly with authorized distributors, as availability may be restricted. Ensure the ordering part number matches the required voltage thresholds exactly, as these are non-adjustable hardware settings determined at manufacture.

Selection Notes

Select this component when simultaneous monitoring of multiple voltage rails is required in space-constrained designs. The adjustable input allows customization for non-standard voltage levels, while fixed options simplify design for common logic levels. Consider the low quiescent current for battery-operated applications and the small package size for dense PCB layouts. Verify that the open-drain output configuration aligns with the downstream logic requirements.

Part Context

The MAX6338 belongs to the Maxim Integrated supervisory circuit family designed for microprocessor and memory protection. It replaces discrete comparator solutions, reducing bill-of-materials complexity. The µMAX package offers a footprint advantage over traditional SOIC packages, facilitating miniaturization in modern electronic devices where board real estate is limited.

Replacement Considerations

Direct substitutes include other MAX6338 variants with different suffixes (e.g., MAX6338CUB+, MAX6338BUB+) which share the same pinout but offer different fixed threshold combinations. Cross-referencing datasheets is essential to ensure the replacement's threshold voltages match the target application's requirements.