Analog Devices Inc./Maxim Integrated MAX6756UKRD3

Overview

MAX6756UKRD3 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 1.8V nominal detection, ±15% window select via SET pin, 100ms minimum reset timeout, and operates from -40°C to +125°C in SOT23-5 package. Used in microprocessor power supervision for DC-DC converters and embedded controllers.

For engineers reviewing the MAX6756UKRD3 datasheet, MAX6756UKRD3 pinout, MAX6756UKRD3 application, or MAX6756UKRD3 equivalent, key selection criteria include its 1.8V ±15% window, open-drain RESET output with 100ms timeout, manual reset input (MR), low 10µA supply current, and guaranteed operation down to VCC = 1.0V - critical for battery-backed and automotive-grade power monitoring designs.

Technical Context

The MAX6756UKRD3 implements a precision internal voltage reference with comparator-based window detection logic, where UVTH and OVTH thresholds are derived from a factory-trimmed resistor divider scaled to 1.8V nominal. The SET pin configures hysteresis as ±5%, ±10%, or ±15% by biasing to GND, VCC, or VCC/2 respectively.

It integrates a 100ms minimum timeout circuit triggered on VCC crossing UVTH or OVTH, with propagation delay of 20µs (typ) for fast fault response. MR asserts RESET immediately and holds it for tMR_P (100–320ms) after release, while RESET remains valid even as VCC drops to 1.0V - enabling reliable brownout recovery in low-voltage systems.

Key Specifications

Pinout & Package

MAX6756UKRD3 is housed in a 5-pin SOT23-5 package with exposed pad (EP) internally connected to GND. 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 full -40°C to +125°C range.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar single-supply window detection applications.

Compared with TLV809E18DBZR and MAX6315US29D3+, the MAX6756UKRD3 uniquely delivers true window supervision (UV+OV) on a 1.8V rail with ±15% adjustability, manual reset, and guaranteed sub-1.0V VCC operation - making it the only option among the three qualified for safety-critical dual-threshold monitoring in compact, low-power embedded systems.

Availability

MAX6756UKRD3 is available at Aetrix Electronics and suitable for microprocessor power supervision, automotive body electronics, and industrial PLC modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6756UKRD3 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 demanding industrial, automotive, and communications applications.

The MAX6754–MAX6764 family was engineered specifically for robust, low-power voltage monitoring in space-constrained embedded systems - delivering factory-trimmed accuracy, wide temperature operation, and flexible window configuration without external components.

FAQ

What is the exact undervoltage and overvoltage threshold for MAX6756UKRD3?

The MAX6756UKRD3 has a factory-trimmed nominal VCC threshold of 1.8V (suffix 'W'). With SET biased to VCC/2 for ±15% window, UVTH is 1.53V (min) and OVTH is 2.07V (max) at +25°C, with ±0.7% hysteresis. These values shift predictably over temperature, maintaining functional window integrity across -40°C to +125°C.

Does MAX6756UKRD3 support overvoltage detection on supplies other than VCC?

No. The MAX6756UKRD3 is a single-voltage window detector that monitors only VCC. Dual-voltage variants (e.g., MAX6760–MAX6762) support VCC2 monitoring, but MAX6756UKRD3 lacks VCC2 pin and associated circuitry - its functionality is strictly limited to the VCC supply rail.

How does the manual reset (MR) pin interact with the 100ms timeout on MAX6756UKRD3?

When MR is pulled low, MAX6756UKRD3 immediately asserts the open-drain RESET output. After MR returns high, RESET remains asserted for the full D3 timeout period (100–320ms), independent of VCC status. This ensures reset persistence during manual recovery sequences, even if VCC stabilizes before timeout completes.

Can MAX6756UKRD3 operate with VCC below 1.8V, and what happens to RESET output?

Yes. MAX6756UKRD3 operates with VCC as low as 1.0V. While detection accuracy degrades below 1.4V (per datasheet Note 2), the RESET output remains logically valid and correctly asserted/deasserted down to 1.0V - enabling fail-safe brownout handling in deep undervoltage conditions.

Is the SET pin on MAX6756UKRD3 compatible with direct connection to VCC/2 using a resistor divider?

Yes. The SET pin accepts a bias voltage of VCC/2 to enable ±15% window mode. Its input bias current is ±1µA, so a high-impedance divider (e.g., two 100kΩ resistors) introduces negligible error. The internal SET input-voltage range (0.1×VCC + 0.51V to 0.9×VCC – 0.51V) accommodates this configuration across full VCC range.