Analog Devices Inc./Maxim Integrated MAX6466XR34+T

Overview

MAX6466XR34+T from Maxim Integrated is a micropower supervisory circuit with open-drain active-low reset output, 3.4V lower trip threshold (VTH− = 3.349V typ), 150ms minimum reset timeout, and ±2.5% threshold accuracy over −40°C to +125°C. It monitors VCC supply voltage in battery-powered systems and asserts reset until VCC rises above VTH+ = 3.500V × 1.05 ≈ 3.675V.

For engineers reviewing the MAX6466XR34+T datasheet, MAX6466XR34+T pinout, MAX6466XR34+T application, or MAX6466XR34+T equivalent, key selection criteria include guaranteed 150ms reset pulse width, ultra-low 1.0µA supply current at 3.6V, internal 5% hysteresis, immunity to short transients, and SC70-3 lead-free packaging for space-constrained portable designs.

Technical Context

The MAX6466XR34+T implements a precision bandgap reference and comparator with factory-trimmed resistor networks to set VTH− = 3.349V (typ) and VTH+ = 3.500V × 1.05 = 3.675V (typ). Its open-drain output requires an external pullup and remains asserted low for ≥150ms after VCC exceeds VTH+, ensuring reliable µP reset deassertion timing.

This device belongs to the MAX6464–MAX6466 subgroup, distinguished from MAX6461–MAX6463 by its built-in timeout function instead of propagation-delay-only detection. It operates across 1.2V–6.0V VCC and maintains ±2.5% threshold accuracy over full industrial temperature range without external components.

Key Specifications

Pinout & Package

MAX6466XR34+T is housed in a 3-pin SC70-3 package (2.0mm × 2.1mm × 0.95mm), optimized for high-density PCB layouts in portable equipment. Pin 1 is OUT (open-drain active-low), Pin 2 is GND, and Pin 3 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6466XR34+T, the MAX6466UR34+T offers identical functionality in a mechanically distinct SOT23-3 package, while TPS3808G33DBVR trades threshold precision and ultra-low current for extended timeout-making MAX6466XR34+T optimal for 3.4V battery cutoff with minimal power overhead.

Availability

MAX6466XR34+T is available at Aetrix Electronics and suitable for precision battery monitoring, noise-immune µP reset circuits, and portable medical devices requiring stable component supply across automotive, industrial, and consumer temperature ranges.

Supply support for MAX6466XR34+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, sensing, and interface applications, with emphasis on low-power, high-reliability solutions.

The MAX6461–MAX6466 family was engineered specifically for ultra-low-power voltage supervision in battery-critical systems, delivering factory-trimmed thresholds, integrated hysteresis, and guaranteed reset timing without external components.

FAQ

What is the exact lower voltage threshold (VTH−) of MAX6466XR34+T at +25°C?

The MAX6466XR34+T has a nominal lower trip threshold of 3.4V, with a typical VTH− value of 3.349V at +25°C per Table 1a. The device guarantees VTH− between 3.315V (min) and 3.485V (max) across −40°C to +125°C, meeting ±2.5% accuracy specification. This precise factory-trimmed threshold eliminates need for external resistive dividers in 3.3V system supervision.

Does MAX6466XR34+T require an external pullup resistor on its OUT pin?

Yes, MAX6466XR34+T features an open-drain active-low output and requires an external pullup resistor to function correctly. The datasheet specifies that the pullup can connect to any voltage from 0V to 6V. For standard 3.3V logic interfacing, a 10kΩ resistor to 3.3V is typical-ensuring VOL ≤ 0.4V at ISINK = 1.0mA while minimizing standby current.

What is the minimum reset timeout period guaranteed by MAX6466XR34+T?

MAX6466XR34+T guarantees a minimum reset timeout period (tRP) of 150ms, with typical value of 260ms and maximum of 430ms across temperature. This built-in timer ensures the active-low reset signal remains asserted for ≥150ms after VCC rises above VTH+, satisfying JEDEC JESD76 and most microcontroller reset timing requirements without external RC networks.

Can MAX6466XR34+T operate with supply voltages below 1.6V?

MAX6466XR34+T is specified to operate down to VCC = 1.2V per Absolute Maximum Ratings and Electrical Characteristics tables, though its 3.4V threshold implies it is intended for systems where VCC nominally exceeds 3.4V. Below 1.2V, output sinking capability degrades; for valid operation down to 0V, a 100kΩ pull-down resistor is recommended to ensure defined logic state during brownout.

How does the internal hysteresis of MAX6466XR34+T improve system reliability?

MAX6466XR34+T incorporates 5% internal hysteresis (VHYST = [(VTH+) − (VTH−)] / VTH− × 100%), resulting in VTH+ ≈ 3.675V for its 3.4V threshold variant. This creates distinct rising and falling trip points, preventing output oscillation ("chatter") when VCC lingers near the threshold due to noise or slow ramp rates-critical for stable µP initialization in noisy or thermally varying environments.