Analog Devices Inc./Maxim Integrated MAX6326XR28+T

Overview

MAX6326XR28+T from Maxim Integrated is an ultra-low-power, active-low push-pull microprocessor supervisory circuit designed to monitor 2.8V power supplies and assert a reset signal during brownout or power-up conditions. It features a factory-trimmed 2.800V reset threshold (±1.5% at +25°C), 100ms minimum reset timeout, 1µA max supply current at 3V, and guaranteed operation down to VCC = 1.2V over –40°C to +85°C. It is used in portable battery-powered systems requiring reliable, low-quiescent-power power-on reset functionality.

For engineers reviewing the MAX6326XR28+T datasheet, MAX6326XR28+T pinout, MAX6326XR28+T application, or MAX6326XR28+T equivalent, this page provides verified technical context, pin-level design meaning, real-world use scenarios, and validated alternative options for µP reset supervision in space-constrained, low-power embedded systems.

Technical Context

The MAX6326XR28+T implements a precision bandgap-based reset comparator with 40ppm/°C tempco and 6.3mV hysteresis, ensuring stable threshold behavior across temperature. Its internal timing circuit guarantees ≥100ms reset assertion after VCC rises above 2.800V, with immunity to transients ≤20µs at 100mV overdrive.

It operates as a single-function supervisor: no external components required, no configuration pins, and no enable input - only VCC, GND, and RESET. The push-pull output drives high (≥0.8·VCC) when not asserted and low (≤0.3V at 1.6mA sink) when asserted, eliminating need for external pull-up resistors.

Key Specifications

Pinout & Package

MAX6326XR28+T is housed in a 3-pin SC70-3 package (package code X3-2), footprint-compatible with SOT23-3 but 30% smaller. Pin 1 = GND, Pin 2 = RESET (active-low push-pull), Pin 3 = VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD2+T and TPS3808G33DBVR, the MAX6326XR28+T uniquely combines 2.8V precision threshold, 1µA ultra-low ICC, and guaranteed 1.2V operation in SC70-3 - making it optimal for compact, long-life, low-voltage reset supervision where minimal BOM and deterministic brownout response are critical.

Availability

MAX6326XR28+T is available at Aetrix Electronics and suitable for battery-powered IoT sensors, medical wearables, industrial PLC modules, and point-of-sale terminals requiring stable component supply and long-term manufacturability.

Supply support for MAX6326XR28+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 is a U.S.-based semiconductor company specializing in analog and mixed-signal ICs for industrial, communications, computing, and consumer applications.

The MAX6326 family is part of Maxim's ultra-low-power supervisory product line, engineered specifically for reliable, zero-calibration reset generation in space- and energy-constrained embedded systems.

FAQ

What is the exact reset threshold voltage of MAX6326XR28+T and how tightly is it specified?

The MAX6326XR28+T has a factory-trimmed nominal reset threshold of 2.800V. At +25°C, this is guaranteed within ±1.5% (2.758V to 2.842V). Over the full –40°C to +85°C operating range, the threshold remains within ±2.5% (2.730V to 2.870V). This tight tolerance eliminates need for external adjustment and ensures consistent reset behavior across temperature and unit-to-unit variation.

Does MAX6326XR28+T require any external components to function?

No, the MAX6326XR28+T requires no external components. Its internal precision voltage reference, comparator, and timing circuit operate autonomously. Unlike discrete reset solutions, it needs only VCC, GND, and the RESET output connection - no pull-up resistors, capacitors, or trimming networks - reducing bill-of-materials and PCB footprint.

What is the minimum VCC voltage at which MAX6326XR28+T guarantees correct reset output state?

The MAX6326XR28+T guarantees correct RESET output state down to VCC = 1.2V over the full –40°C to +85°C temperature range. This ensures predictable behavior during deep brownout events, allowing systems to hold processors in reset until sufficient supply voltage is restored - a key reliability feature absent in many competing supervisors.

How does the push-pull output of MAX6326XR28+T differ from open-drain alternatives like MAX6328XR28+T?

The MAX6326XR28+T features an active-low push-pull RESET output, meaning it actively drives both high (≥0.8·VCC) and low (≤0.3V at 1.6mA) states. In contrast, the MAX6328XR28+T uses an open-drain output requiring an external pull-up resistor. The push-pull architecture simplifies design, reduces component count, and improves noise immunity by eliminating reliance on external passive elements.

Is MAX6326XR28+T compatible with standard SC70-3 footprint and reflow profiles?

Yes, the MAX6326XR28+T uses the industry-standard SC70-3 package (outline 21-0075, land pattern 90-0208) and is RoHS-compliant with lead-free termination (+T suffix). It is qualified for standard Pb-free reflow profiles per JEDEC J-STD-020, and its thermal characteristics (174mW at +70°C, derating 2.7mW/°C) are fully specified for automated assembly.