MAX6855UK38D4+T

Supervisors Overview

The MAX6855UK38D4+T is a single-channel voltage supervisory circuit manufactured by Analog Devices Inc. under the Maxim Integrated brand. It operates within a supply voltage range of 1.2V to 5.5V and features a fixed reset threshold voltage of 3.8V. The device utilizes an active-high, push-pull output configuration and includes a manual reset input for system control. It incorporates a watchdog timer with a timeout period of 1.2 seconds minimum. The component is housed in a compact SOT-23-5 surface-mount package and supports operation across an extended temperature range from -40°C to +85°C.

Supervisors Feature Summary

• Integrates voltage monitoring, manual reset input, and watchdog timer functions into a single channel.
• Provides active-high push-pull reset output for reliable logic interfacing.
• Features ultra-low quiescent current consumption suitable for battery-powered applications.

Supervisors Applications

• Microprocessor (µP) power supply supervision
• Battery-operated electronic systems
• Portable consumer devices requiring low standby current

Supervisors Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels due to potential availability constraints. Confirm RoHS compliance status and lead-free packaging specifications prior to procurement. Ensure that the specific suffix D4 corresponds to the required tape-and-reel quantity and handling requirements for your manufacturing process. Cross-reference the exact part number against current Analog Devices inventory lists to confirm production status.

Supervisors Selection Notes

Select this component when an active-high reset signal is required for the target logic family. The 3.8V threshold is appropriate for monitoring 3.3V nominal rails with sufficient margin. Consider the manual reset capability if hardware-initiated system resets are necessary. Evaluate the 1.2s watchdog timeout against the maximum allowable processor execution time to ensure proper fault detection without false triggers during normal operation.

Supervisors Part Context

This device belongs to the MAX6854/MAX6855/MAX6856/MAX6858/MAX6860–MAX6869 series of nano-power µP supervisory circuits. These devices combine voltage monitoring, watchdog timer, and manual reset input functions in a 5-pin SOT23 package. They assert a reset signal whenever the monitored voltage drops below the factory-trimmed reset threshold voltage, manual reset is asserted, or the watchdog timer expires.

Supervisors Replacement Considerations

Compatible substitutes within the same series include MAX6855 variants with different threshold voltages such as MAX6855UK34D4+T (3.4V) or MAX6855UK19D4+T (1.9V). For alternative manufacturers, verify equivalent pinout, electrical characteristics, and package dimensions before substitution. Ensure any replacement maintains the active-high output polarity and manual reset functionality if these features are critical to the design.