Analog Devices Inc./Maxim Integrated MAX6466XR44+

Overview

MAX6466XR44+ from Maxim Integrated is a micropower supervisory circuit with open-drain active-low output, 4.4V lower trip threshold (VTH−), 150ms minimum reset timeout period, and ±2.5% threshold accuracy over −40°C to +125°C - used for reliable power-on reset and brownout detection in battery-powered medical devices and portable instrumentation.

For engineers reviewing the MAX6466XR44+ datasheet, MAX6466XR44+ pinout, MAX6466XR44+ application, or MAX6466XR44+ equivalent, key selection criteria include its 1.0µA supply current at 3.6V, internal 5% hysteresis (VTH+ = VTH− × 1.05), immunity to short voltage transients, and SC70-3 package compatibility with space-constrained PCB layouts.

Technical Context

The MAX6466XR44+ implements a precision bandgap reference and comparator with factory-trimmed resistor networks to set VTH− = 4.400V (±2.5%) and VTH+ = 4.620V (±2.5%). Its internal timeout circuit ensures reset assertion lasts ≥150ms after VCC rises above VTH+, preventing premature µP release during power ramp-up.

It uses open-drain output requiring an external pullup, enabling level-shifting across logic domains up to 6V. The device achieves transient immunity via propagation delay tuning: falling-edge response is 17µs (typ), while rising-edge response is intentionally delayed by the timeout block - not by comparator dynamics alone.

Key Specifications

Pinout & Package

MAX6466XR44+ is housed in a 3-pin SC70-3 package (2.0mm × 2.1mm × 0.95mm), optimized for ultra-compact 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 TLV803EB44DBZR and TPS3808G33DBVR, MAX6466XR44+ uniquely combines 4.4V precision threshold, open-drain output, 150ms fixed timeout, and SC70-3 packaging - making it optimal for compact, battery-critical systems needing level-shifted reset signaling.

Availability

MAX6466XR44+ is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor nodes, and automotive telematics modules requiring stable component supply, long-term lifecycle support, and lead-free compliance.

Supply support for MAX6466XR44+ 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 high-performance analog and mixed-signal ICs for power, sensing, and interface applications in industrial, automotive, and medical markets.

The MAX6461–MAX6466 family was engineered specifically for ultra-low-power voltage supervision in space- and energy-constrained portable electronics - delivering precision thresholds, guaranteed timeout, and minimal bill-of-materials impact.

FAQ

What is the exact voltage threshold of MAX6466XR44+ and how is it specified?

The MAX6466XR44+ has a factory-trimmed lower trip threshold (VTH−) of 4.400V with ±2.5% tolerance over −40°C to +125°C, and upper threshold (VTH+) of 4.620V (VTH− × 1.05). These values are confirmed in Table 1a and 1b of the datasheet, and apply specifically to the "44" suffix variant of MAX6466XR44+.

Does MAX6466XR44+ require external components to operate?

No, MAX6466XR44+ requires no external resistors or capacitors for basic operation. Its threshold, hysteresis, and 150ms timeout are fully internal. Only an external pullup resistor on the open-drain OUT pin is needed - typically 10kΩ to 100kΩ - to establish logic-high voltage level.

What is the function of the reset timeout in MAX6466XR44+?

The reset timeout in MAX6466XR44+ ensures the active-low reset signal remains asserted for ≥150ms after VCC rises above VTH+, even if VCC stabilizes quickly. This guarantees the microcontroller completes internal power-on initialization before release - a requirement for most ARM and PIC devices.

Can MAX6466XR44+ monitor voltages above 5.5V?

No, MAX6466XR44+ is rated for VCC operation from 1.2V to 6.0V absolute maximum, but its factory-set 4.4V threshold is intended for nominal 4.5V–5.0V rails. Monitoring >5.5V violates the recommended operating range and risks exceeding the ±2.5% accuracy guarantee - use MAX6466XR55+ for 5.5V rails instead.

Is MAX6466XR44+ compatible with lead-free PCB assembly processes?

Yes, MAX6466XR44+ uses lead-free packaging (as indicated by the "+" suffix per Maxim's ordering convention) and is qualified for standard Pb-free reflow profiles including JEDEC J-STD-020, with peak temperatures up to +260°C. The SC70-3 package is RoHS-compliant and halogen-free.