Analog Devices Inc./Maxim Integrated MAX6328XR30+T

Overview

MAX6328XR30+T from Maxim Integrated is an open-drain, active-low microprocessor supervisory circuit in SC70-3 package, designed to monitor 3.0V power supplies and assert reset when VCC falls below 3.00V (±1.5% at +25°C), with ≥100ms reset timeout after recovery. It draws ≤1µA supply current and operates from -40°C to +85°C, used in portable battery-powered systems requiring reliable brownout detection.

For engineers reviewing the MAX6328XR30+T datasheet, MAX6328XR30+T pinout, MAX6328XR30+T application, or MAX6328XR30+T equivalent, key selection criteria include reset threshold accuracy (±2.5% over temperature), open-drain output compatibility with bidirectional µP reset pins, ultra-low ICC for battery life, transient immunity up to 100µs at 100mV overdrive, and SC70-3 footprint constraints.

Technical Context

The MAX6328XR30+T implements a precision bandgap-based voltage comparator with factory-trimmed 3.00V reset threshold and 6.3mV hysteresis, ensuring stable reset assertion during VCC droop. Its internal timing circuit guarantees minimum 100ms reset pulse width after VCC rises above threshold, independent of supply ramp rate.

As an open-drain RESET output device, it requires an external pull-up resistor and interfaces directly with µPs having bidirectional reset pins (e.g., Motorola 68HC11). The comparator is immune to fast negative-going VCC transients ≤100µs duration when overdrive exceeds 100mV.

Key Specifications

Pinout & Package

MAX6328XR30+T is housed in a 3-pin SC70-3 package (outline X3-2, land pattern 90-0208), with 1.3mm × 0.8mm footprint and 0.65mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3+T and TPS3808G30DBVR, the MAX6328XR30+T uniquely combines SC70-3 size, true open-drain output, and sub-1µA ICC-making it optimal for space-constrained, battery-critical 3.0V systems where reset bus sharing is required and no additional features are needed.

Availability

MAX6328XR30+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter communication units, and automotive infotainment subsystems requiring stable component supply and long-term manufacturability.

Supply support for MAX6328XR30+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 industrial, communications, and consumer applications, with emphasis on power management and sensor interface solutions.

The MAX6326/MAX6327/MAX6328 family delivers ultra-low-power, factory-trimmed voltage supervisors targeting battery-operated and space-constrained embedded systems needing reliable, no-component reset functionality.

FAQ

What is the exact reset threshold voltage of MAX6328XR30+T and how does it vary with temperature?

The MAX6328XR30+T has a nominal reset threshold of 3.00V with ±1.5% tolerance at +25°C and ±2.5% over the full -40°C to +85°C operating range. Its temperature coefficient is 40ppm/°C, resulting in a maximum deviation of ±20mV across the temperature range - verified per Electrical Characteristics Table in the official datasheet.

Does MAX6328XR30+T require any external components to operate?

No, the MAX6328XR30+T requires no external components for basic reset supervision. Only an external pull-up resistor on the open-drain RESET pin is needed for proper logic-level assertion - no capacitors, resistors, or trimming networks are required, reducing BOM count and PCB area.

Can MAX6328XR30+T be used with microcontrollers that have bidirectional reset pins?

Yes, the MAX6328XR30+T's open-drain RESET output is specifically designed for interfacing with bidirectional µP reset pins (e.g., Motorola 68HC11). When combined with a single pull-up resistor, either the MAX6328XR30+T or the µP can assert reset - enabling flexible system-level reset coordination.

What is the minimum VCC voltage at which MAX6328XR30+T remains functional?

The MAX6328XR30+T is guaranteed to maintain correct reset state down to VCC = 1.2V over the full -40°C to +85°C temperature range. Below 1.2V, reset behavior is not specified - this ensures reliable operation during deep brownout conditions before complete power loss.

Is MAX6328XR30+T RoHS-compliant and what does the "+T" suffix indicate?

Yes, MAX6328XR30+T is RoHS-compliant and lead-free. The "+T" suffix explicitly denotes lead-free, tape-and-reel packaging per Maxim Integrated's ordering convention - replacing the legacy "-T" suffix to indicate compliance with EU RoHS Directive 2011/65/EU.