MAX6338CUB

Overview

The MAX6338CUB 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 thresholds for +5.0V, +3.3V, +1.8V, and adjustable settings. The device operates within a supply voltage range of 2.5V to 5.5V with a typical quiescent current of 35µA. It provides four independent active-low open-drain 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 resistors or capacitors.
• Provides four independent active-low open-drain reset outputs for flexible logic interfacing.
• Offers factory-programmed threshold options for standard voltages plus an adjustable comparator mode for custom monitoring.
• Ensures high accuracy with 2.5% threshold tolerance across the industrial temperature range.

Applications

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

Procurement Notes

Verify the specific suffix code (e.g., CUB) against the official datasheet to confirm exact threshold voltages and package type. Confirm RoHS compliance status and lead times directly with authorized distributors, as availability varies by region. Ensure the ordering part number matches the required input voltage options and output configuration before purchase.

Selection Notes

Select this component when simultaneous monitoring of four distinct power rails is required in space-constrained designs. Choose the CUB variant if its specific factory-trimmed thresholds align with the target system voltages. Consider the adjustable option if custom threshold levels are needed. Verify that the open-drain output structure fits the downstream logic requirements.

Part Context

The MAX6338 belongs to Maxim's µPower Supervisory Circuit family, designed for low-power applications. It complements other MAX633x variants that may offer watchdog timers or manual reset inputs. The µMAX package allows for high-density PCB layouts. This series is widely used in portable and battery-operated devices where power efficiency and board space are critical constraints.

Replacement Considerations

Direct substitutes include other MAX6338 variants with different suffixes for adjusted thresholds or packages. Cross-reference with MAX6339 or MAX6340 if additional features like watchdog timers are required. Verify pin compatibility and electrical specifications before substituting.