Analog Devices Inc./Maxim Integrated MAX6464XR44+T

Overview

MAX6464XR44+T from Maxim Integrated is a micropower supervisory circuit with active-low push-pull output, monitoring VCC at 4.40V (VTH− = 4.40V, VTH+ = 4.62V), featuring 150ms minimum reset timeout, ±2.5% threshold accuracy over −40°C to +125°C, and 1.0µA supply current at 3.6V - used in battery-powered medical devices for reliable power-on reset and brownout detection.

For engineers reviewing the MAX6464XR44+T datasheet, MAX6464XR44+T pinout, MAX6464XR44+T application, or MAX6464XR44+T equivalent, key selection criteria include guaranteed 150ms reset assertion time after VCC recovery, internal 5% hysteresis, SC70-3 package compatibility, and operation down to 1.2V supply - critical for low-voltage portable systems requiring deterministic reset behavior under transient conditions.

Technical Context

The MAX6464XR44+T implements a precision bandgap reference and comparator-based voltage monitoring architecture with factory-trimmed resistor networks defining its 4.40V lower trip point (VTH−) and 4.62V upper trip point (VTH+). Its internal hysteresis ensures stable output during supply fluctuations near threshold.

This device belongs to the MAX6464–MAX6466 subfamily configured specifically for µP reset supervision: it asserts output low upon VCC drop below VTH− and holds low for ≥150ms after VCC rises above VTH+, independent of propagation delay - a timing-critical function distinct from simple voltage detectors like the MAX6461–MAX6463.

Key Specifications

Pinout & Package

MAX6464XR44+T is housed in a 3-pin SC70-3 package (2.0mm × 2.1mm, 0.5mm pitch), optimized for space-constrained portable designs. Pin 1 is OUT, Pin 2 is GND, Pin 3 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6464UR44+T, the MAX6464XR44+T offers 30% smaller PCB area and tighter thermal resistance control; compared with TPS3808G33DBVR, it delivers exact 4.40V detection without calibration overhead or accuracy degradation from external components.

Availability

MAX6464XR44+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered IoT endpoints, and industrial handheld scanners requiring stable component supply with guaranteed long-term manufacturability and lead-free compliance.

Supply support for MAX6464XR44+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) is a U.S.-based semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.

The MAX6461–MAX6466 family was designed specifically for ultra-low-power voltage monitoring in space- and energy-constrained systems - delivering factory-trimmed thresholds, integrated hysteresis, and guaranteed reset timing without external components.

FAQ

What is the exact reset threshold voltage of the MAX6464XR44+T?

The MAX6464XR44+T has a factory-set lower trip threshold (VTH−) of 4.40V nominal at +25°C, with guaranteed range 4.290V to 4.510V over −40°C to +125°C. Its upper trip threshold (VTH+) is 4.62V nominal (VTH− × 1.05), enabling stable reset release with 5% hysteresis. This matches standard 4.5V system rails requiring precise brownout detection.

Does the MAX6464XR44+T require any external components for basic reset functionality?

No, the MAX6464XR44+T requires zero external components for core supervisory operation. Its precision bandgap reference, trimmed resistor network, comparator, and 150ms timeout circuit are fully integrated. Only decoupling capacitance (e.g., 0.1µF ceramic near VCC/GND) is recommended for noise immunity - no resistors, capacitors, or diodes are needed for threshold setting or timing.

How does the reset timeout behavior of the MAX6464XR44+T differ from voltage detector variants like MAX6461?

Unlike the MAX6461 (voltage detector with 17µs propagation delay), the MAX6464XR44+T is a µP supervisory circuit that holds its active-low output asserted for a minimum of 150ms after VCC rises above VTH+, regardless of how quickly VCC recovers. This deterministic timeout ensures microcontrollers complete full reset initialization - a requirement absent in simple detectors.

Can the MAX6464XR44+T operate from a 1.8V supply rail?

Yes, the MAX6464XR44+T operates from 1.2V to 6.0V, so it functions correctly at 1.8V. However, its 4.40V threshold means it will assert reset continuously when VCC = 1.8V - it is intended to monitor higher-voltage rails (e.g., 3.3V or 4.5V systems) while being powered from a compatible supply. Its low 1.0µA ICC enables use in auxiliary monitoring paths.

Is the SC70-3 package of the MAX6464XR44+T compatible with standard SOT23-3 reflow profiles?

Yes, the MAX6464XR44+T in SC70-3 uses JEDEC-standard reflow profiles compatible with SOT23-3. Though physically smaller (2.0mm × 2.1mm vs. 2.9mm × 1.6mm), its thermal mass and lead finish match industry norms. Reflow peak temperature (260°C max), time above liquidus (60–150s), and ramp rates align with IPC/JEDEC J-STD-020 - no process changes are required for migration from SOT23-3.