Analog Devices Inc./Maxim Integrated MAX6466XR16+T

Overview

MAX6466XR16+T from Maxim Integrated is a lead-free, ultra-low-power microprocessor supervisory circuit in SC70-3 package, featuring 1.6V lower trip threshold (VTH−), 150ms minimum reset timeout, ±2.5% threshold accuracy over −40°C to +125°C, and open-drain active-low output. It monitors VCC supply voltage in battery-powered medical devices and portable electronics where reliable power-on reset and glitch immunity are critical.

For engineers reviewing the MAX6466XR16+T datasheet, MAX6466XR16+T pinout, MAX6466XR16+T application, or MAX6466XR16+T equivalent, key selection considerations include its factory-trimmed 1.6V detection threshold, guaranteed 150ms reset assertion time after VCC recovery, open-drain output compatibility with mixed-voltage logic interfaces, and 1.0µA quiescent current at 3.6V.

Technical Context

The MAX6466XR16+T implements a precision bandgap reference and comparator with internally trimmed resistor networks to set VTH− = 1.600V (±2.5%) and VTH+ = 1.672V (±2.5%), delivering 5% hysteresis (VHYST = [(VTH+) − (VTH−)] / VTH− × 100%). Its open-drain output requires an external pullup and asserts low when VCC falls below VTH−, remaining asserted for ≥150ms after VCC rises above VTH+.

This device operates across the full industrial temperature range (−40°C to +125°C) with no external components required, and features immunity to short VCC transients-e.g., it ignores falling glitches ≤18µs wide when VCC undershoots VTH− by 100mV, per Typical Operating Characteristics Figure 4.

Key Specifications

Pinout & Package

MAX6466XR16+T is housed in a 3-pin SC70-3 package (2.0mm × 2.1mm × 0.95mm), optimized for space-constrained portable designs. Pin 1 is OUT (open-drain active-low), Pin 2 is GND, and Pin 3 is VCC - matching the SC70-3 footprint of MAX6461–MAX6466 family members.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6466XR16+T, MAX6466UR16+T offers identical electrical specs in a more widely supported package, while TPS3808G16DBVR trades open-drain flexibility and ultra-low ICC for higher drive capability and different timeout behavior-making MAX6466XR16+T optimal for space- and power-constrained battery systems requiring level-shifted reset signaling.

Availability

MAX6466XR16+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered IoT endpoints, industrial handheld terminals, and automotive cabin controllers requiring stable component supply with long-term lifecycle support.

Supply support for MAX6466XR16+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, mixed-signal, and power management ICs for demanding industrial, medical, and automotive applications.

The MAX6461–MAX6466 family was engineered specifically for ultra-low-power supervisory functions in space- and energy-constrained systems, emphasizing factory-trimmed accuracy, zero-external-component operation, and robust transient immunity.

FAQ

What is the exact lower voltage threshold (VTH−) of MAX6466XR16+T and how is it specified?

The MAX6466XR16+T has a nominal lower trip threshold VTH− of 1.600V at +25°C, with guaranteed limits of 1.560V (min) to 1.640V (max) across −40°C to +125°C per Table 1a. This value is factory-trimmed and does not require external calibration. The "16" suffix in MAX6466XR16+T explicitly denotes this 1.6V threshold variant within the MAX6466 family.

Does MAX6466XR16+T provide a reset timeout period, and what is its guaranteed minimum duration?

Yes, MAX6466XR16+T is a µP supervisory circuit (not a basic voltage detector) and provides a minimum reset timeout period of 150ms. This means that once VCC rises above VTH+, the /RESET output remains asserted for at least 150ms before deasserting-ensuring sufficient time for power supply stabilization and processor initialization. The timeout is internally generated and does not depend on external capacitors.

What output configuration does MAX6466XR16+T use, and how should it be interfaced?

MAX6466XR16+T uses an open-drain, active-low output configuration. To interface, connect an external pullup resistor from the OUT pin (Pin 1) to the target logic voltage (e.g., 1.8V, 3.3V, or 5.0V). The device sinks up to 1.0mA while asserted, with VOL ≤ 0.4V at VCC ≥ 4.5V and ISINK = 9.0mA. No pullup is required if driving a CMOS input with compatible voltage levels.

How does MAX6466XR16+T handle short voltage transients on the VCC line?

MAX6466XR16+T is designed to reject short-duration VCC transients: per Figure 4 in the datasheet, it ignores falling glitches ≤18µs wide when VCC undershoots VTH− by 100mV. This immunity stems from internal filtering and comparator hysteresis, preventing spurious resets during switching noise or load-step events in DC/DC converter outputs.

Is MAX6466XR16+T compatible with lead-free PCB assembly processes?

Yes, MAX6466XR16+T is explicitly designated as lead-free via the "+T" suffix, indicating compliance with RoHS Directive 2011/65/EU. It is qualified for standard Pb-free reflow profiles (J-STD-020), with a maximum peak temperature of +260°C and 60-second liquidus time. The SC70-3 package uses matte tin terminations suitable for no-clean solder pastes.