Analog Devices Inc./Maxim Integrated MAX6466UK31+T

Overview

MAX6466UK31+T from Maxim Integrated is a micropower supervisory circuit with open-drain active-low reset output, 3.1V nominal trip threshold (VTH−), 150ms minimum reset timeout period, ±2.5% threshold accuracy over −40°C to +125°C, and 1.0µA supply current at 3.6V - used for reliable power-on reset and brownout detection in battery-powered medical devices and portable instrumentation.

For engineers reviewing the MAX6466UK31+T datasheet, MAX6466UK31+T pinout, MAX6466UK31+T application, or MAX6466UK31+T equivalent, key selection criteria include guaranteed 150ms reset assertion after VCC recovery, open-drain output compatibility with mixed-voltage logic interfaces, ultra-low ICC enabling multi-year coin-cell operation, and factory-trimmed 3.1V threshold with 5% hysteresis (VTH+ = 3.255V).

Technical Context

The MAX6466UK31+T implements a precision bandgap reference and comparator with internally trimmed resistor networks to set fixed 3.1V falling-edge detection (VTH−) and 3.255V rising-edge release (VTH+) thresholds. Its internal 5% hysteresis prevents chatter during slow-rising or noisy supply transitions.

This device belongs to the MAX6464–MAX6466 µP supervisory subgroup and features a dedicated reset timeout circuit that holds the open-drain output asserted low for ≥150ms after VCC exceeds VTH+, independent of propagation delay - ensuring sufficient processor initialization time before system release.

Key Specifications

Pinout & Package

MAX6466UK31+T is housed in a 5-pin SOT23-5 package with exposed pad (pin 5 is GND), rated for −40°C to +125°C operation and lead-free assembly (RoHS-compliant +T suffix). Pin 1 is OUT, pin 2 is GND, pin 3 is VCC, pin 4 is N.C., and pin 5 is GND - both GND pins must be connected for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar µP supervisory applications.

Compared with MAX6466UK31+T, the TPS3808G33DBVR offers higher drive capability but lacks open-drain versatility and operates at 3.3V instead of 3.1V, while the ADM6315-31ARTZ-RL provides superior accuracy and longer timeout but is limited to +105°C - making MAX6466UK31+T optimal for extended-temperature, battery-critical designs requiring exact 3.1V detection and logic-domain isolation.

Availability

MAX6466UK31+T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, and industrial handheld scanners requiring stable component supply, long-term lifecycle support, and RoHS-compliant lead-free packaging.

Supply support for MAX6466UK31+T 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, with emphasis on ultra-low-power and high-reliability solutions.

The MAX6461–MAX6466 family was engineered specifically for battery-critical systems requiring guaranteed reset timing, minimal quiescent current, and factory-trimmed voltage thresholds - targeting portable instrumentation, wearables, and industrial edge nodes.

FAQ

What is the exact reset threshold voltage of MAX6466UK31+T and how does it vary with temperature?

The MAX6466UK31+T has a nominal lower trip threshold (VTH−) of 3.100V at +25°C, with guaranteed tolerance of ±2.5% across −40°C to +125°C. Per Table 1a, the min/max values are 3.023V and 3.178V over full temperature range. The upper release threshold (VTH+) is fixed at VTH− × 1.05 = 3.255V nominal, providing 5% hysteresis to prevent oscillation near threshold.

Does MAX6466UK31+T require external components to operate correctly?

No, MAX6466UK31+T requires no external components for basic supervisory function. It integrates a precision bandgap reference, comparator, trimmed resistive divider, and hysteresis circuit. Only an external pull-up resistor on the open-drain OUT pin is needed to define the logic-high level - typically 10kΩ to 3.3V or 5V depending on host logic domain.

How does the 150ms reset timeout period of MAX6466UK31+T behave during supply recovery?

When VCC rises above VTH+ (3.255V), MAX6466UK31+T initiates its internal timeout counter and holds the open-drain OUT pin low for a minimum of 150ms - regardless of subsequent VCC fluctuations. This ensures the microcontroller receives a clean, extended reset pulse sufficient for oscillator startup and register initialization before release.

Can MAX6466UK31+T interface with a 1.8V microcontroller reset input?

Yes, MAX6466UK31+T's open-drain output allows direct interface with 1.8V logic. Connect the OUT pin to the µC's /RESET input and use a pull-up resistor to 1.8V. When asserted, OUT sinks current to GND (VOL ≤ 0.4V at 9mA), delivering a valid logic low; when released, the 1.8V pull-up defines a safe logic high without risk of overvoltage.

What is the supply current consumption of MAX6466UK31+T across its full operating range?

MAX6466UK31+T draws 1.0µA typical supply current (ICC) at VCC = 3.6V and TA = +25°C. Over −40°C to +125°C and VCC = 1.2V to 6.0V, ICC remains ≤3.5µA (max at +85°C to +125°C, VCC = 5.0V). This ultra-low ICC enables multi-year operation on standard coin cells without duty cycling.