Analog Devices Inc./Maxim Integrated MAX6756UKWD3

Overview

The MAX6756UKWD3 from Maxim Integrated is a low-power, single-voltage window detector IC that monitors system supply voltage (VCC) for undervoltage and overvoltage conditions, asserting an active-low open-drain RESET output when thresholds are violated. It features factory-trimmed 3.3V nominal monitoring, ±10% window (SET = VCC), 100ms minimum reset timeout (D3 suffix), manual reset input (MR), and operates from -40°C to +125°C in SOT23-5 package. It is used in microprocessor power supervision for telecom and industrial embedded systems.

For engineers reviewing the MAX6756UKWD3 datasheet, MAX6756UKWD3 pinout, MAX6756UKWD3 application, or MAX6756UKWD3 equivalent, key selection criteria include its fixed 3.3V monitoring point, ±10% window tolerance, 100ms reset timeout, open-drain output drive capability, and compatibility with noisy 3.3V rail environments requiring robust transient immunity.

Technical Context

The MAX6756UKWD3 implements a precision internal bandgap reference and dual comparators to detect VCC falling below UVTH or rising above OVTH. Its SET pin configures threshold hysteresis to ±5%, ±10%, or ±15%; for this part, SET = VCC selects ±10%. The device uses a 20µs propagation delay architecture for fast fault response and guarantees correct output state down to VCC = 1.0V.

It integrates a manual reset input (MR) with 26kΩ internal pullup and 4µs minimum pulse width, enabling external system-initiated resets. The open-drain RESET output supports flexible logic-level interfacing and wired-OR configurations, with VOL ≤ 0.3V at ISINK = 100µA and leakage < 1µA when deasserted.

Key Specifications

Pinout & Package

MAX6756UKWD3 is housed in a 5-pin SOT23-5 package with exposed pad (not electrically connected). Pin 1 is VCC, Pin 2 is GND, Pin 3 is MR, Pin 4 is RESET, and Pin 5 is SET. All pins support operation across the full -40°C to +125°C range.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6755UKWD3 and TLV809K33DBZR, the MAX6756UKWD3 uniquely provides combined UV/OV window detection with open-drain output flexibility and ±10% hysteresis-critical for systems where both overvoltage and undervoltage faults must trigger identical reset behavior without level-shifting components.

Availability

MAX6756UKWD3 is available at Aetrix Electronics and suitable for telecom power supervision, industrial PLC I/O modules, automotive body control units, and server management controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6756UKWD3 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 demanding industrial, automotive, and communications systems.

The MAX6754–MAX6764 family was engineered specifically for high-reliability power supply monitoring, delivering factory-trimmed voltage thresholds, configurable hysteresis, and robust transient immunity in miniature packages for space-constrained embedded systems.

FAQ

What is the exact undervoltage and overvoltage threshold range for MAX6756UKWD3?

The MAX6756UKWD3 has a nominal 3.3V monitoring point with ±10% window tolerance (SET = VCC), resulting in a guaranteed undervoltage threshold (UVTH) of 2.97V to 3.053V and overvoltage threshold (OVTH) of 3.63V to 3.713V across -40°C to +125°C. These values are factory-trimmed and specified in the Electrical Characteristics table under "T, 3.3V" row with SET = VCC condition.

Does MAX6756UKWD3 support dual-voltage monitoring?

No, MAX6756UKWD3 is a single-voltage window detector monitoring only VCC. Dual-voltage variants (e.g., MAX6760–MAX6762) include VCC2 pin and separate UV/OV outputs; MAX6756UKWD3 lacks VCC2 and provides only one combined RESET output for both UV and OV events.

What is the function of the SET pin on MAX6756UKWD3?

On MAX6756UKWD3, the SET pin selects the window hysteresis: tied to VCC (as indicated by the 'W' suffix in the part number decoding), it configures ±10% threshold deviation. SET must be hard-wired to VCC or GND (for ±5%) - floating or resistor-divider biasing is not supported for this variant.

Can MAX6756UKWD3 operate with VCC below 3.3V?

Yes, MAX6756UKWD3 functions with VCC as low as 1.0V, though its internal reference and comparators remain accurate only when VCC ≥ 1.4V. Below 1.4V, RESET stays asserted in its last valid state - a design feature enabling fail-safe behavior during deep brownouts.

Is the RESET output of MAX6756UKWD3 compatible with 1.8V logic systems?

Yes, the open-drain RESET output of MAX6756UKWD3 is fully compatible with 1.8V logic. When externally pulled to 1.8V, it asserts low ≤ 0.3V (ISINK = 100µA) and presents < 1µA leakage when deasserted, meeting standard 1.8V CMOS input thresholds without level-shifting circuitry.