Analog Devices Inc./Maxim Integrated MAX6466UK26+T

Overview

MAX6466UK26+T from Maxim Integrated is a micropower supervisory circuit with open-drain active-low reset output, 2.6V lower trip threshold (VTH−), and 150ms minimum reset timeout period. It monitors system supply voltage in battery-powered devices, provides noise-immune reset assertion during brownout, and operates over −40°C to +125°C with ±2.5% threshold accuracy. Designed for portable medical equipment and cellular handsets requiring ultra-low quiescent current.

For engineers reviewing the MAX6466UK26+T datasheet, MAX6466UK26+T pinout, MAX6466UK26+T application, or MAX6466UK26+T equivalent, key selection criteria include guaranteed 150ms reset timeout, 1.0µA supply current at 3.6V, internal 5% hysteresis, and SOT23-5 open-drain compatibility with mixed-voltage logic interfaces.

Technical Context

The MAX6466UK26+T implements a precision bandgap reference and comparator with internally trimmed resistor networks to set VTH− = 2.600V (±2.5%) and VTH+ = 2.730V (VTH− × 1.05). Its open-drain output requires an external pullup and asserts low when VCC falls below VTH−, remaining low for ≥150ms after VCC rises above VTH+.

This device belongs to the MAX6464–MAX6466 µP supervisory subgroup and features immunity to short voltage transients (e.g., ≤18µs glitch at 200mV overdrive), no external components required, and full specification across automotive-grade temperature range (−40°C to +125°C).

Key Specifications

Pinout & Package

MAX6466UK26+T is housed in a 5-pin SOT23 package (JEDEC MO-178AA), with pins 1–5 assigned as OUT, GND, GND, VCC, and N.C. Both GND pins must be connected to system ground for proper operation and thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6466UK26+T, the MAX6466UR26+T offers identical electrical behavior in a smaller SOT23-3 package but sacrifices thermal robustness and ground-noise rejection; the TPS3808G18DBVR differs fundamentally in threshold, output architecture, and current consumption - requiring schematic and layout changes.

Availability

MAX6466UK26+T is available at Aetrix Electronics and suitable for portable medical devices, cellular handsets, industrial sensor nodes, and automotive telematics modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6466UK26+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 connectivity applications, with emphasis on high-reliability, low-power solutions.

The MAX6461–MAX6466 family was developed specifically for ultra-low-power voltage monitoring and µP reset generation in space- and energy-constrained systems such as wearables, medical sensors, and automotive ECUs.

FAQ

What is the exact voltage threshold of MAX6466UK26+T?

The MAX6466UK26+T has a factory-trimmed lower trip threshold (VTH−) of 2.600V ±2.5% over −40°C to +125°C, with corresponding upper threshold (VTH+) of 2.730V (VTH− × 1.05). This is confirmed in Table 1a of the datasheet under suffix "26", and applies specifically to the MAX6466UK26+T variant within the MAX6464–MAX6466 supervisory subgroup.

Does MAX6466UK26+T require external components for basic operation?

No, MAX6466UK26+T requires no external components for core supervision functionality. However, its open-drain output mandates an external pullup resistor to define the high-state voltage level - typically connected to the target logic rail (e.g., 1.8V or 3.3V). No capacitors, resistors for threshold setting, or trimming circuits are needed.

What is the function of Pin 5 (N.C.) on MAX6466UK26+T?

Pin 5 of MAX6466UK26+T is designated N.C. (No Connection) and is electrically isolated from internal circuitry. It must remain unconnected in the PCB layout. This pin exists for mechanical compatibility with the SOT23-5 package standard and does not serve any electrical function in the MAX6466UK26+T device.

How does the 150ms reset timeout of MAX6466UK26+T behave during supply recovery?

When VCC rises above VTH+ (2.730V), the MAX6466UK26+T holds its open-drain output asserted (low) for a minimum of 150ms before releasing it. This timeout is guaranteed across temperature and supply voltage, ensuring microcontrollers complete internal power-on reset sequences even if VCC stabilizes rapidly.

Can MAX6466UK26+T monitor a 1.8V supply rail?

No, MAX6466UK26+T is factory-set to monitor a 2.6V nominal rail and cannot be reconfigured. Its VTH− = 2.600V is fixed by internal resistor trimming. For 1.8V supervision, a different variant (e.g., MAX6466UK18+T) or alternate family member would be required - the MAX6466UK26+T will assert reset continuously if used on a 1.8V rail.