Analog Devices Inc./Maxim Integrated MAX6466XR46+T

Overview

MAX6466XR46+T from Maxim Integrated is a lead-free, ultra-low-power microprocessor supervisory circuit in SC70-3 package, featuring 4.6V lower trip threshold (VTH−), 150ms minimum reset timeout, ±2.5% threshold accuracy over −40°C to +125°C, and open-drain active-low output. It monitors system supply voltage in battery-powered medical devices and portable instrumentation where reliable power-on reset and glitch immunity are critical.

For engineers reviewing the MAX6466XR46+T datasheet, MAX6466XR46+T pinout, MAX6466XR46+T application, or MAX6466XR46+T equivalent, key selection criteria include guaranteed 150ms reset assertion after VCC recovery, 1.0µA supply current at 3.6V, internal 5% hysteresis, and compatibility with logic supplies up to 6V via external pullup-enabling robust reset generation without external timing components.

Technical Context

The MAX6466XR46+T implements a precision bandgap reference and comparator with internally trimmed resistor networks to set VTH− = 4.531V (min) / 4.600V (typ) / 4.669V (max) at +25°C, and VTH+ = 4.735V (min) / 4.807V (typ) / 4.879V (max). 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 MAX6466XR46+T integrates a minimum 150ms reset timeout period-ensuring the reset signal remains active for ≥150ms after VCC rises above VTH+, independent of propagation delay. It achieves 17µs typical propagation delay on VCC fall and operates down to 1.2V supply while maintaining full −40°C to +125°C specification compliance.

Key Specifications

Pinout & Package

MAX6466XR46+T is housed in a 3-pin SC70-3 package (2.0mm × 2.1mm, 0.65mm 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 MAX6466XR46+T, MAX6465XR46+T offers identical supervision functionality but simplifies interface design for active-high reset inputs, while TPS3808G33DBVR serves 3.3V applications with longer timeout but higher current and incompatible pinout-making MAX6466XR46+T optimal for 4.6V brownout detection in space- and power-constrained 5V systems.

Availability

MAX6466XR46+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered data loggers, industrial handheld scanners, and low-power IoT edge nodes requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6466XR46+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 management, sensing, and interface applications, with emphasis on high-reliability, low-power solutions.

The MAX6461–MAX6466 family was engineered specifically for ultra-low-power microprocessor reset supervision in battery-critical systems-delivering factory-trimmed thresholds, integrated timeout, and nanoscale leakage performance without external components.

FAQ

What is the exact VTH− threshold voltage for MAX6466XR46+T at +25°C?

The MAX6466XR46+T has a nominal lower trip threshold (VTH−) of 4.600V at +25°C, with a guaranteed range of 4.531V (min) to 4.669V (max) per Table 1a. This value is factory-trimmed and specified over the full −40°C to +125°C operating range with ±2.5% accuracy.

Does MAX6466XR46+T require an external pullup resistor on the OUT pin?

Yes, MAX6466XR46+T uses an open-drain active-low output configuration, so an external pullup resistor is mandatory to establish a defined logic-high state when the output is not asserted. The pullup can connect to any voltage rail from 0V to 6V, enabling flexible level-shifting in mixed-voltage systems.

What is the minimum reset timeout period guaranteed for MAX6466XR46+T?

The MAX6466XR46+T guarantees a minimum reset timeout period of 150ms. Once VCC rises above VTH+, the OUT pin remains asserted (low) for at least 150ms before releasing, ensuring sufficient time for microprocessor initialization and peripheral stabilization without external timing components.

Can MAX6466XR46+T operate with supply voltages below 1.6V?

Yes, MAX6466XR46+T operates from 1.2V to 6.0V per Absolute Maximum Ratings and Electrical Characteristics. However, its 4.6V threshold function is only meaningful when VCC ≥ 4.6V; below that, the device remains in reset. The 1.2V lower limit ensures functionality during deep brownout or startup sequences.

How does the internal hysteresis of MAX6466XR46+T improve system reliability?

The MAX6466XR46+T incorporates 5% internal hysteresis (VTH+ = VTH− × 1.05), creating distinct rising and falling trip points. This prevents output oscillation ("chatter") when VCC lingers near the threshold due to noise or slow ramp rates-critical for stable reset assertion in noisy power environments like DC/DC converters.