Analog Devices Inc./Maxim Integrated MAX6466UR22+T

Overview

MAX6466UR22+T from Maxim Integrated is a micropower supervisory circuit with active-low open-drain output, 2.2V lower trip threshold (VTH−), and minimum 150ms reset timeout period. It monitors VCC supply voltage in battery-powered systems, asserts reset during undervoltage conditions, and holds reset for ≥150ms after recovery-ensuring reliable µP initialization. Designed for portable medical devices and cellular handsets requiring ultra-low quiescent current (1.0µA) and ±2.5% threshold accuracy over −40°C to +125°C.

For engineers reviewing the MAX6466UR22+T datasheet, MAX6466UR22+T pinout, MAX6466UR22+T application, or MAX6466UR22+T equivalent, key selection criteria include its 2.2V detection threshold, 150ms minimum timeout, open-drain output stage, SC70-3 package compatibility, and immunity to short VCC transients-critical for robust power-on reset in space-constrained, low-power embedded designs.

Technical Context

The MAX6466UR22+T implements a precision bandgap reference and comparator with internally trimmed resistor networks to set VTH− = 2.200V (±2.5% over temperature) and VTH+ = VTH− × 1.05 = 2.310V. Its internal 5% hysteresis prevents output chatter near threshold transitions.

This device belongs to the MAX6464–MAX6466 subgroup, featuring a guaranteed minimum reset timeout of 150ms after VCC rises above VTH+, unlike the MAX6461–MAX6463 voltage detectors which lack timeout functionality. The open-drain output requires an external pullup and supports logic-level interfacing independent of VCC.

Key Specifications

Pinout & Package

MAX6466UR22+T is housed in a 3-pin SC70-3 package (2.0mm × 2.1mm × 0.9mm), optimized for ultra-compact 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 MAX6466XR22+T, the MAX6466UR22+T delivers identical supervision functionality in the same SC70-3 package with standardized reel packaging, while the TPS3808G125DBVR trades compactness and exact threshold match for added flexibility via /MR-making MAX6466UR22+T optimal for cost- and space-sensitive 2.2V brownout detection.

Availability

MAX6466UR22+T is available at Aetrix Electronics and suitable for portable medical devices, cellular handsets, and industrial IoT edge nodes requiring stable component supply, long-term lifecycle support, and lead-free compliance.

Supply support for MAX6466UR22+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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and consumer applications.

The MAX6461–MAX6466 family was designed specifically for ultra-low-power voltage monitoring and µP reset generation in battery-operated and thermally demanding systems-emphasizing minimal ICC, factory-trimmed thresholds, and robust transient immunity without external components.

FAQ

What is the exact voltage threshold of MAX6466UR22+T and how accurate is it over temperature?

The MAX6466UR22+T has a nominal lower trip threshold (VTH−) of 2.200V at +25°C, with guaranteed accuracy of ±2.5% across the full −40°C to +125°C operating range. This corresponds to a minimum VTH− of 2.145V and maximum of 2.255V under worst-case conditions, as confirmed in Table 1a of the datasheet. The upper threshold VTH+ is fixed at VTH− × 1.05 = 2.310V (±2.5%).

Does MAX6466UR22+T require external components to function?

No, MAX6466UR22+T requires no external components for basic operation. Its precision bandgap reference, comparator, and trimmed resistor network are fully integrated. Only an external pullup resistor is needed on the open-drain OUT pin to establish the logic-high level-typically 10kΩ to 100kΩ depending on rise-time and bus capacitance requirements.

Can MAX6466UR22+T be used with a 1.8V logic system while monitoring a 3.3V supply?

Yes, MAX6466UR22+T supports this configuration. Its open-drain OUT pin can be pulled up to 1.8V (or any voltage from 0V to 6V), while VCC is connected to the 3.3V supply being monitored. This enables level-shifting without additional interface circuitry-confirmed in the Applications Information section and Figure 1 of the datasheet.

What is the minimum reset timeout period of MAX6466UR22+T and is it adjustable?

The MAX6466UR22+T guarantees a minimum reset timeout period of 150ms after VCC rises above VTH+, with typical values up to 260ms and maximum up to 430ms (per Electrical Characteristics table). This timeout is fixed and internally generated-no external capacitors or resistors are used or supported for adjustment.

How does MAX6466UR22+T handle short voltage transients on the VCC line?

MAX6466UR22+T is immune to short-duration VCC transients: for a 200mV overdrive (i.e., VCC dip to VTH− − 200mV), it tolerates pulses up to ~15µs without asserting reset, as shown in Figure 4 (MAX6461 toc04). This built-in glitch rejection eliminates need for external RC filters in noisy switch-mode power supply environments.