Analog Devices Inc./Maxim Integrated MAX6383XR29D2

Overview

MAX6383XR29D2 from Maxim Integrated is a single-supply, open-drain active-low microprocessor supervisory circuit in a 3-pin SC70 package. It monitors VCC from +1.0V to +5.5V with a factory-set reset threshold of +2.93V (min) / +3.00V (nom) / +3.08V (max), guarantees valid reset output down to VCC = 1V, consumes only 3µA at +1.8V, and provides a 140ms minimum reset timeout period. It is used in portable battery-powered equipment for reliable power-on reset and brownout protection.

For engineers reviewing the MAX6383XR29D2 datasheet, MAX6383XR29D2 pinout, MAX6383XR29D2 application, or MAX6383XR29D2 equivalent, key selection criteria include its open-drain active-low reset output, ±2.5% threshold accuracy over –40°C to +125°C, 140ms reset timeout, low 3µA supply current at 1.8V, and compatibility with systems requiring guaranteed reset assertion down to VCC = 1V.

Technical Context

The MAX6383XR29D2 implements a precision voltage comparator with internal 1.27V reference for threshold detection and a monostable timer for fixed 140ms reset assertion after VCC recovery. Its open-drain RESET output requires an external pull-up resistor and remains asserted during VCC undervoltage, power-down, or brownout events.

It operates across –40°C to +125°C with 60ppm/°C reset threshold tempco and exhibits negative-going VCC transient immunity up to 35µs at 100mV overdrive. No manual reset (MR) or auxiliary RESET IN inputs are present - this variant is a basic single-monitor configuration.

Key Specifications

Pinout & Package

Package: 3-pin SC70 (X3-2), 1.25mm × 0.85mm × 0.65mm, lead-free, surface-mount.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor reset applications.

Compared with MAX809TRD2+T and TPS3808G30DBVR, the MAX6383XR29D2 uniquely combines open-drain output, 3µA supply current, and validated operation down to VCC = 1V - making it optimal for battery-backed, multi-rail, or noise-prone embedded systems where reset bus sharing and deep brownout reliability are mandatory.

Availability

MAX6383XR29D2 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter battery backup circuits, and automotive body control modules requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6383XR29D2 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 industrial, automotive, communications, and computing markets.

The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy µP supervisory circuits targeting space- and energy-constrained embedded systems where reliable power-on reset and brownout protection are non-negotiable.

FAQ

What is the exact reset threshold voltage range for MAX6383XR29D2?

The MAX6383XR29D2 has a factory-set reset threshold of +2.93V (minimum), +3.00V (nominal), and +3.08V (maximum) over the full operating temperature range of –40°C to +125°C. This corresponds to the "29" suffix in the part number and is specified with ±2.5% accuracy, ensuring consistent detection of 3.0V supply undervoltage across industrial environments.

Does MAX6383XR29D2 include a manual reset (MR) input?

No, the MAX6383XR29D2 does not include a manual reset (MR) input. Per the selector guide and pin description, MR is only present on MAX6384/MAX6385/MAX6386/MAX6390 variants. The MAX6383XR29D2 is a minimal-feature variant with only VCC, GND, and open-drain RESET pins - designed for cost- and space-sensitive applications requiring only automatic power-supply monitoring.

What is the function of the open-drain RESET output in MAX6383XR29D2?

The open-drain RESET output in MAX6383XR29D2 requires an external pull-up resistor to a defined voltage rail (e.g., 1.8V, 3.3V, or 5V). When asserted (low), it actively sinks ≥80µA while holding the reset line low; when deasserted (high), it presents high impedance, allowing other devices on the same reset bus to drive the line. This enables wired-OR reset architectures and mixed-voltage system interfacing - a key differentiator from push-pull alternatives.

Can MAX6383XR29D2 operate reliably below 1.8V supply voltage?

Yes, the MAX6383XR29D2 is fully specified to operate down to VCC = +1.0V and guarantees correct RESET output logic state (valid low/high assertion) for VCC ≥ 1V. At VCC = 1.0V, it still sinks ≥80µA with VOL ≤ 0.3V when asserted. This capability is essential for battery-fail-safe operation in systems using primary lithium or supercapacitor backup, where supply may decay well below 1.8V before shutdown.

What package and footprint does MAX6383XR29D2 use?

The MAX6383XR29D2 uses the 3-pin SC70 package (package code X3-2), measuring 1.25mm × 0.85mm × 0.65mm with a 0.65mm pin pitch. It is RoHS-compliant and lead-free. The pinout is GND (pin 1), RESET (pin 2), and VCC (pin 3) - identical to industry-standard SC70-3 supervisors, enabling drop-in replacement in existing layouts designed for compatible parts like MAX809 or TPS3808.