Analog Devices Inc./Maxim Integrated MAX6466XR18+T

Overview

MAX6466XR18+T from Maxim Integrated is a lead-free, ultra-low-power microprocessor supervisory circuit in SC70-3 package, featuring 1.8V lower trip threshold (VTH− = 1.800V typ), 150ms minimum reset timeout period, and open-drain active-low output. It monitors system supply voltage in battery-powered portable medical devices and cellular phones, asserting reset until VCC rises above VTH+ = 1.890V (5% hysteresis).

For engineers reviewing the MAX6466XR18+T datasheet, MAX6466XR18+T pinout, MAX6466XR18+T application, or MAX6466XR18+T equivalent, this page delivers verified electrical specs, thermal performance across −40°C to +125°C, output stage behavior under load, transient immunity data, and real-world design guidance for reset timing integrity and logic-level interfacing.

Technical Context

The MAX6466XR18+T implements a precision bandgap reference with internally trimmed resistor networks to set fixed 1.8V detection threshold and 5% internal hysteresis (VTH+ = VTH− × 1.05). Its comparator architecture ensures stable output assertion during slow-rising/falling VCC transitions without external components.

As a µP supervisory variant (not voltage detector), it integrates a guaranteed minimum 150ms reset timeout after VCC exceeds VTH+, independent of propagation delay. The open-drain output requires an external pullup and supports interface to logic supplies up to +6V, enabling level-shifting between disparate voltage domains.

Key Specifications

Pinout & Package

MAX6466XR18+T is housed in a 3-pin SC70-3 package (2.0mm × 2.1mm × 0.95mm), 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 MAX6466XR18+T, the MAX6466UR18+T offers identical functionality in a more widely supported SOT23-3 package but occupies ~40% more board area, while the TPS3808G18DBVR provides higher drive capability at the cost of increased quiescent current and loss of open-drain flexibility for shared reset buses.

Availability

MAX6466XR18+T is available at Aetrix Electronics and suitable for portable medical devices, cellular phone power sequencing, and industrial handheld terminals requiring stable component supply with guaranteed long-term availability and lead-free compliance.

Supply support for MAX6466XR18+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, with emphasis on ultra-low-power and high-reliability solutions.

The MAX6461–MAX6466 family was engineered specifically for battery-critical systems requiring dependable, zero-calibration reset supervision across extreme temperatures - targeting portable, medical, and industrial edge devices.

FAQ

What is the exact voltage threshold and hysteresis of MAX6466XR18+T?

The MAX6466XR18+T has a lower trip threshold (VTH−) of 1.755V (min) to 1.845V (max) over −40°C to +125°C, with typical value 1.800V at +25°C. Its upper threshold (VTH+) is VTH− × 1.05, yielding 1.843V (min) to 1.937V (max), resulting in 4.5% to 6.0% hysteresis. These values are factory-trimmed and do not require external calibration.

Does MAX6466XR18+T require an external pullup resistor on the OUT pin?

Yes, MAX6466XR18+T features an open-drain active-low output and requires an external pullup resistor to establish a defined logic-high state when not asserted. The pullup may connect to any supply from 0V to +6V, enabling level-shifting; resistor value must balance VOL specification (≤0.4V at 9mA sink) and rise-time requirements.

What is the guaranteed minimum reset timeout period for MAX6466XR18+T?

The MAX6466XR18+T guarantees a minimum reset timeout period of 150ms after VCC rises above VTH+. This is distinct from propagation delay and ensures the /RESET signal remains asserted long enough for microcontrollers like ARM Cortex-M series to complete internal initialization, even under worst-case temperature and voltage conditions.

Can MAX6466XR18+T operate with supply voltages below 1.6V?

No - MAX6466XR18+T is specified for operation from +1.2V to +6.0V, but its 1.8V threshold function is only guaranteed when VCC ≥ 1.2V. Below 1.2V, the internal bandgap reference and comparator may become unstable; the device does not monitor or assert reset reliably below this absolute minimum supply voltage.

How does MAX6466XR18+T handle short voltage transients on VCC?

MAX6466XR18+T is immune to short falling transients: at 100mV overdrive (i.e., VCC = VTH− − 0.1V), it rejects pulses up to ~15µs duration, per the Typical Operating Characteristics graph. This prevents false resets from switching noise or ESD-induced dips, ensuring robust operation in electrically noisy portable environments.