Analog Devices Inc./Maxim Integrated MAX6466UK29+T

Overview

MAX6466UK29+T from Maxim Integrated is a micropower supervisory circuit with open-drain active-low reset output, 2.9V lower trip threshold (VTH−), and 150ms minimum reset timeout period. It operates from 1.2V to 6V supply, draws only 1.0µA at 3.6V, and features ±2.5% threshold accuracy over −40°C to +125°C - used for reliable power-on reset in battery-powered medical sensors and portable instrumentation.

For engineers reviewing the MAX6466UK29+T datasheet, MAX6466UK29+T pinout, MAX6466UK29+T application, or MAX6466UK29+T equivalent, key selection criteria include guaranteed 150ms reset assertion after VCC recovery, open-drain compatibility with mixed-voltage logic interfaces, immunity to sub-20µs VCC transients, and lead-free SOT23-5 packaging qualified for automotive-grade temperature operation.

Technical Context

The MAX6466UK29+T implements a precision bandgap reference and comparator with internally trimmed resistor networks to set VTH− = 2.900V (±2.5%) and VTH+ = VTH− × 1.05 = 3.045V, enabling hysteresis-based glitch rejection. Its open-drain output requires an external pullup and sinks ≥1.0mA at VOL ≤ 0.4V when asserted.

Unlike voltage detectors (e.g., MAX6461–MAX6463), the MAX6466UK29+T integrates a minimum 150ms reset timeout timer that holds OUT low for ≥150ms after VCC exceeds VTH+, ensuring stable µP initialization. It is specified across the full −40°C to +125°C industrial/automotive range with no external components required.

Key Specifications

Pinout & Package

SOT23-5 package: 2.9mm × 1.6mm × 1.1mm body, lead-free (RoHS-compliant), tape-and-reel delivery. Dual GND pins (pins 2 and 3) improve thermal dissipation and reduce ground bounce.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6466UR29+T, the MAX6466UK29+T offers superior thermal performance and noise immunity via dual-GND SOT23-5 layout; versus TPS3808G18DBVR, it delivers lower ICC, open-drain flexibility, and exact 2.9V threshold alignment - critical for legacy 3.0V system compatibility.

Availability

MAX6466UK29+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered data loggers, and automotive cabin controllers requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.

Supply support for MAX6466UK29+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 - emphasizing ultra-low power, high reliability, and extended temperature operation.

The MAX6461–MAX6466 family targets space-constrained, battery-sensitive systems needing accurate, self-contained reset supervision - eliminating external resistors, capacitors, and calibration while maintaining automotive-grade robustness.

FAQ

What is the exact reset threshold voltage of the MAX6466UK29+T?

The MAX6466UK29+T has a factory-trimmed lower trip threshold (VTH−) of 2.900V with ±2.5% accuracy over −40°C to +125°C. Its upper threshold (VTH+) is 3.045V (VTH− × 1.05), providing 5% hysteresis to prevent oscillation near the trip point. These values are confirmed in Table 1a and Table 1b of the official datasheet.

Does the MAX6466UK29+T require external components to operate?

No, the MAX6466UK29+T requires no external components for basic operation. Its precision bandgap reference, comparator, trimmed resistor network, and internal hysteresis are fully integrated. Only an external pullup resistor is needed on the open-drain OUT pin to establish the high-state logic level - no timing capacitors or threshold-setting resistors are necessary.

How does the reset timeout function work in the MAX6466UK29+T?

The MAX6466UK29+T asserts its open-drain OUT pin low when VCC falls below 2.900V and holds it low for a minimum of 150ms after VCC rises above 3.045V. This guaranteed timeout ensures microcontrollers complete power-up sequencing and register initialization before release - independent of external RC networks or software delays.

Can the MAX6466UK29+T interface with a 1.8V logic system while supervising a 3.3V supply?

Yes. The MAX6466UK29+T's open-drain OUT pin can be pulled up to 1.8V (or any voltage from 0V to 6V) using an external resistor. This allows it to drive 1.8V logic inputs directly while monitoring a separate 3.3V VCC rail - eliminating level-shifters and simplifying mixed-voltage system design.

What is the maximum transient duration the MAX6466UK29+T can ignore at its 2.9V threshold?

At a 2.9V threshold (VTH−), the MAX6466UK29+T rejects VCC transients shorter than approximately 17µs when the overdrive magnitude is 100mV (i.e., VCC drops to 2.8V). This immunity is documented in the "Maximum VCC Transient Duration vs. VTH− Threshold Overdrive" graph (Figure 4) and ensures robust operation in noisy DC/DC converter environments.