Analog Devices Inc./Maxim Integrated MAX6755UKLD3+

Overview

MAX6755UKLD3+ from Maxim Integrated is a low-power, single-voltage window detector IC that monitors system supply voltage (VCC) for undervoltage and overvoltage conditions, asserting a combined active-high push-pull RESET output when thresholds are violated. It features factory-trimmed 5V nominal monitoring, ±5% window tolerance (SET = GND), 100ms minimum reset timeout (D3 suffix), 10µA supply current, and operates from -40°C to +125°C in SOT23-5 package. It is used in microprocessor power supervision for servers and industrial controllers.

For engineers reviewing the MAX6755UKLD3+ datasheet, MAX6755UKLD3+ pinout, MAX6755UKLD3+ application, or MAX6755UKLD3+ equivalent, key selection criteria include its fixed 5V threshold with ±5% window, active-high push-pull reset output, 100ms timeout delay, manual reset input (MR), and compatibility with 1V–6V VCC operation - critical for reliable brownout and overvoltage protection in embedded power management.

Technical Context

The MAX6755UKLD3+ implements a precision bandgap reference and comparator-based window detection architecture with internal voltage dividers calibrated for 5V nominal VCC monitoring. Its SET pin selects ±5%, ±10%, or ±15% window hysteresis by connecting to GND, VCC, or VCC/2 respectively.

It provides a single active-high push-pull RESET output that asserts when VCC falls below UVTH (4.500V min) or rises above OVTH (5.500V max) at TA = -40°C to +125°C, with propagation delay of 20µs (typ) and guaranteed deassertion after ≥100ms once VCC returns within window. MR input enables external reset initiation with 4µs minimum pulse width and 26kΩ internal pullup.

Key Specifications

Pinout & Package

MAX6755UKLD3+ is housed in a 5-pin SOT23-5 package with exposed pad (EP) internally connected to GND. Pin 1 is VCC (power input and monitored supply), Pin 2 is GND, Pin 3 is MR (active-low manual reset), Pin 4 is RESET (active-high push-pull output), and Pin 5 is SET (threshold window select).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage monitor applications.

Compared with TLV809E50DBZR and ADM6315-5ARTZ-RL7, MAX6755UKLD3+ uniquely delivers combined undervoltage/overvoltage detection with user-selectable ±5%/±10%/±15% windows, active-high push-pull output eliminating external components, and integrated manual reset - making it optimal for robust, configurable power supervision in harsh environments.

Availability

MAX6755UKLD3+ is available at Aetrix Electronics and suitable for server CPU power supervision, industrial PLC power monitoring, and automotive infotainment head unit applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6755UKLD3+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for power management, sensing, and interface applications in industrial, automotive, and computing markets.

The MAX6754–MAX6764 family was developed specifically for high-reliability power supply monitoring, offering factory-trimmed window detectors with selectable hysteresis, ultra-low quiescent current, and extended temperature operation - targeting mission-critical embedded systems.

FAQ

What is the exact undervoltage and overvoltage threshold range for MAX6755UKLD3+ at -40°C to +125°C?

The MAX6755UKLD3+ has a factory-trimmed 5V nominal threshold with ±5% window (SET = GND). Its guaranteed undervoltage threshold (UVTH) is 4.500V to 4.625V, and overvoltage threshold (OVTH) is 5.375V to 5.500V across the full -40°C to +125°C operating range, as specified in the Electrical Characteristics table under "L, 5V" row with SET = GND.

Does MAX6755UKLD3+ support active-high reset output, and how is it implemented?

Yes, MAX6755UKLD3+ provides an active-high push-pull RESET output (Pin 4). Unlike open-drain variants, it actively drives high without requiring an external pullup resistor. It sources up to 0.8×VCC at 50µA and sinks up to 4.0mA at VCC ≥ 4.75V, making it directly compatible with standard µP reset inputs requiring active-high assertion.

How does the SET pin configure the window tolerance on MAX6755UKLD3+?

On MAX6755UKLD3+, the SET pin selects window tolerance: connect SET to GND for ±5% (4.5V–5.5V), to VCC for ±10% (4.25V–5.75V), or bias to VCC/2 for ±15% (3.75V–6.25V). This is confirmed in the Pin Description table and Functional Diagram 1, and applies specifically to the MAX6754/MAX6755/MAX6756 series.

What is the minimum VCC voltage at which MAX6755UKLD3+ maintains valid RESET output states?

MAX6755UKLD3+ guarantees correct RESET output logic states (high/low) for VCC down to 1.0V, even though accurate voltage monitoring requires VCC ≥ 1.4V. This is explicitly stated in Note 2 of the Electrical Characteristics section and enables safe brownout detection and controlled shutdown sequencing in ultra-low-voltage scenarios.

Is manual reset (MR) functionality available on MAX6755UKLD3+, and what are its electrical characteristics?

Yes, MAX6755UKLD3+ includes an active-low manual reset input (Pin 3). MR has an internal 26kΩ pullup to VCC, accepts logic-low pulses as short as 4µs, and provides 300ns transient immunity. Propagation delay from MR low-to-high is 100ms–320ms (D3 option), matching the reset timeout period, ensuring synchronized release with power recovery.