Analog Devices Inc./Maxim Integrated MAX6465XR29+

Overview

MAX6465XR29+ from Maxim Integrated is a micropower supervisory circuit designed for reliable power-on reset and brownout detection in battery-powered systems. It features a factory-set 2.9V lower trip threshold (VTH−), 150ms minimum reset timeout period, ±2.5% threshold accuracy over −40°C to +125°C, and ultra-low 1.0µA supply current at 3.6V. It operates as an active-high push-pull reset generator in portable medical devices and low-voltage microcontroller applications.

For engineers reviewing the MAX6465XR29+ datasheet, MAX6465XR29+ pinout, MAX6465XR29+ application, or MAX6465XR29+ equivalent, key selection criteria include guaranteed reset assertion duration, hysteresis-enabled noise immunity, lead-free SC70-3 packaging, and compatibility with 1.6V–5.5V supply monitoring without external components.

Technical Context

The MAX6465XR29+ implements a precision bandgap reference and comparator with internally trimmed resistor networks to set its 2.900V nominal VTH− threshold and 3.031V VTH+ (5% hysteresis). Its internal timeout circuit ensures reset remains asserted for ≥150ms after VCC rises above VTH+, preventing premature processor release during power ramp-up.

It uses BiCMOS process technology (581 transistors) and is fully specified across −40°C to +125°C. The device rejects short voltage transients-e.g., a 100mV overdrive allows up to ~15µs glitch immunity per typical operating characteristics-and requires no external capacitors or resistors for basic reset functionality.

Key Specifications

Pinout & Package

MAX6465XR29+ is housed in a lead-free SC70-3 package (3-pin, 1.25mm × 2.0mm footprint, 0.95mm height), optimized for space-constrained portable designs. Pin 1 is OUT, Pin 2 is GND, and Pin 3 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6465XR29+, the MAX6465UR29+T offers identical supervision functionality in a more manufacturable package, while the TPS3808G33DBVR serves different voltage domains and lacks the precise 2.9V trip point needed for Li-ion endpoint detection.

Availability

MAX6465XR29+ is available at Aetrix Electronics and suitable for portable medical devices, low-power IoT end nodes, and industrial handheld terminals requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.

Supply support for MAX6465XR29+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.

The MAX6461–MAX6466 family was designed specifically for ultra-low-power, space-constrained systems requiring accurate, self-contained voltage supervision-eliminating external components while delivering robust reset behavior across extreme temperatures.

FAQ

What is the exact threshold voltage of MAX6465XR29+ and how is it trimmed?

The MAX6465XR29+ has a nominal lower trip threshold (VTH−) of 2.900V at +25°C, with ±2.5% accuracy maintained from −40°C to +125°C. This value is factory-trimmed using internal resistor networks and a precision bandgap reference-no external calibration or adjustment is required. Table 1a confirms VTH− = 2.857V (min) to 2.944V (max) at +25°C, and 2.828V to 2.973V across full temperature range.

Does MAX6465XR29+ require an external capacitor for reset timing?

No, MAX6465XR29+ does not require any external capacitor. Its 150ms minimum reset timeout period is generated entirely by internal circuitry-unlike RC-based supervisors, this eliminates component count, layout sensitivity, and temperature drift concerns. The timeout begins when VCC rises above VTH+ and guarantees reset remains asserted for ≥150ms regardless of supply ramp rate.

Can MAX6465XR29+ be used with a 1.8V supply rail?

Yes, MAX6465XR29+ operates with VCC as low as 1.2V and monitors rails from 1.6V to 5.5V, making it compatible with 1.8V systems. However, its 2.9V threshold is intended for higher rails (e.g., 3.0V/3.3V logic or Li-ion battery endpoints). For 1.8V supervision, a different suffix (e.g., MAX6465XR18+) would be required-MAX6465XR29+ asserts reset when VCC falls below 2.9V, which is above 1.8V.

What is the output drive capability of MAX6465XR29+?

MAX6465XR29+ features a push-pull active-high output capable of sourcing up to 8.0mA at VCC ≥ 4.5V (VOH ≥ 0.8×VCC) and sinking up to 9.0mA at VCC ≥ 4.5V (VOL ≤ 0.4V). At 3.3V supply, it sources ≥2.64V @ 3.0mA and sinks ≤0.3V @ 4.0mA-sufficient to directly drive standard CMOS reset inputs without external buffers.

Is MAX6465XR29+ pin-compatible with other parts in the MAX6461–MAX6466 family?

Yes, MAX6465XR29+ shares identical SC70-3 pinout (OUT, GND, VCC) with all SC70-packaged members of the MAX6461–MAX6466 family-including MAX6461XR29+, MAX6462XR29+, and MAX6464XR29+. Functionally, it differs only in reset behavior (timeout-based vs. instantaneous) and output polarity (active-high push-pull), but physical layout and soldering are interchangeable.