Analog Devices Inc./Maxim Integrated MAX6326XR30-T

Overview

MAX6326XR30-T from Maxim Integrated is an ultra-low-power, active-low push-pull microprocessor supervisory circuit that monitors 3.0V power supplies and asserts a reset signal when VCC drops below 2.955V (min) to 3.045V (max), holding reset for ≥100ms after recovery. It operates from 1.2V to 5.5V, draws ≤1.0µA supply current at 3V, and is housed in a 3-pin SC70-3 package for portable and battery-powered systems requiring reliable brownout protection.

For engineers reviewing the MAX6326XR30-T datasheet, MAX6326XR30-T pinout, MAX6326XR30-T application, or MAX6326XR30-T equivalent, key selection criteria include its factory-trimmed 3.0V reset threshold with ±1.5% room-temperature tolerance, 100ms minimum reset timeout, push-pull active-low output, SC70-3 footprint compatibility, and immunity to fast VCC transients up to 100V/µs slew rate.

Technical Context

The MAX6326XR30-T implements a precision bandgap-based voltage comparator with hysteresis (6.3mV) to detect VCC droop relative to its 3.0V nominal threshold. Its internal reset timer guarantees ≥100ms assertion after power-up or brownout recovery, independent of external components.

It features transient immunity via internal filtering that rejects negative-going VCC glitches up to 200mV overdrive for durations under ~150µs (per Typical Operating Characteristics). The push-pull output drives low (≤0.3V at 1.6mA) during reset and high (≥0.8·VCC) otherwise, eliminating need for external pull-up resistors.

Key Specifications

Pinout & Package

Package: SC70-3 (3-pin, 1.25mm × 0.85mm × 0.55mm body, 0.65mm pitch).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3-T and TPS3808G30DBVR, the MAX6326XR30-T delivers superior ultra-low-power performance (1.0µA vs. ≥1.5µA), guaranteed functionality down to 1.2V VCC, and a compact SC70-3 push-pull solution-making it optimal for battery longevity, deep-brownout resilience, and minimal BOM count in portable and industrial edge nodes.

Availability

MAX6326XR30-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter communication units, and automotive body control modules requiring stable component supply with long-term lifecycle support.

Supply support for MAX6326XR30-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, medical, communications, and consumer applications.

The MAX6326 family targets ultra-low-power microprocessor supervision in battery-operated and space-constrained systems, emphasizing sub-µA quiescent current, factory-trimmed accuracy, and minimal external component count.

FAQ

What is the exact reset threshold voltage range for MAX6326XR30-T at room temperature?

The MAX6326XR30-T has a factory-trimmed reset threshold of 3.000V nominal, with a guaranteed range of 2.955V to 3.045V at +25°C (±1.5%). This tolerance ensures precise 3.0V supply monitoring without calibration, critical for systems where marginal voltage drop must trigger reset before functional failure occurs. The MAX6326XR30-T maintains this specification across its full operating temperature range.

Does MAX6326XR30-T require any external components to function?

No, the MAX6326XR30-T requires zero external components. Its internal precision voltage reference, comparator, reset timer, and push-pull output driver are fully integrated. Unlike open-drain supervisors, the MAX6326XR30-T's push-pull output eliminates the need for an external pull-up resistor-reducing BOM count, PCB area, and potential noise coupling paths in sensitive analog or RF sections.

What is the minimum VCC voltage at which MAX6326XR30-T guarantees correct reset state?

The MAX6326XR30-T guarantees correct reset assertion and deassertion behavior down to VCC = 1.2V over the full -40°C to +85°C temperature range. This capability allows the MAX6326XR30-T to remain functional during deep brownout conditions-such as battery depletion or LDO dropout-ensuring the host µP stays held in reset until supply is truly stable, a key reliability feature absent in many competing supervisors rated only to 1.8V.

How does MAX6326XR30-T handle fast transients on the VCC line?

The MAX6326XR30-T incorporates internal filtering to reject fast negative-going VCC transients. Per its Typical Operating Characteristics, it ignores glitches ≤200mV in amplitude and <150µs in duration-preventing spurious resets during switching regulator noise, motor commutation spikes, or ESD events. This transient immunity is inherent to the MAX6326XR30-T's design and requires no external RC network.

Is MAX6326XR30-T pin-compatible with other common reset ICs like MAX809?

The MAX6326XR30-T uses the SC70-3 package (X3-2 outline) and shares identical pinout (GND, RESET, VCC) with MAX809 variants in SC70-3, enabling direct PCB replacement in many layouts. However, due to differences in reset timeout timing and transient response characteristics, system validation is recommended. The MAX6326XR30-T's lower ICC and extended VCC range provide functional advantages beyond mere pin compatibility.