Analog Devices Inc./Maxim Integrated MAX6326XR22-T

Overview

MAX6326XR22-T from Maxim Integrated is an ultra-low-power, active-low push-pull microprocessor supervisory circuit that monitors VCC supply voltage and asserts a reset signal when voltage falls below 2.20V (±1.5% at +25°C), holding reset active for ≥100ms after recovery. It operates from 1.2V to 5.5V over –40°C to +85°C, draws ≤1.0µA supply current at 3V, and is housed in a 3-pin SC70-3 package. It is used in portable battery-powered systems requiring reliable power-on/brownout reset.

For engineers reviewing the MAX6326XR22-T datasheet, MAX6326XR22-T pinout, MAX6326XR22-T application, or MAX6326XR22-T equivalent, key selection criteria include its factory-trimmed 2.20V reset threshold, 100ms minimum reset timeout, push-pull active-low output, SC70-3 footprint compatibility, and immunity to fast VCC transients up to 100µs at 200mV overdrive.

Technical Context

The MAX6326XR22-T implements a precision bandgap-based reset comparator with 40ppm/°C temperature coefficient and 6.3mV hysteresis, ensuring stable threshold behavior across industrial temperature range. Its internal circuitry guarantees correct reset state down to VCC = 1.0V and ignores transients shorter than 20µs at VTH – VCC = 100mV.

Designed for direct integration into µP power-monitoring paths, it requires no external components and interfaces seamlessly with bidirectional reset pins via its push-pull output-unlike open-drain variants-eliminating need for external pull-up resistors while maintaining noise immunity during power-up, power-down, and brownout events.

Key Specifications

Pinout & Package

MAX6326XR22-T is packaged in a 3-pin SC70-3 (X3-2) surface-mount package with 0.65mm pitch, optimized for space-constrained portable designs. 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 MAX6326XR22-T, MAX809TRD2-T offers higher reset voltage for robust 3.3V operation but lacks 2.20V precision for low-VCC brownout detection; TPS3808G01DBVR adds flexibility via external resistors but increases component count and power draw, making MAX6326XR22-T optimal for fixed-threshold, ultra-low-power 2.5V/3V portable designs.

Availability

MAX6326XR22-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter data loggers, and automotive body control units requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.

Supply support for MAX6326XR22-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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.

The MAX6326 family delivers ultra-low-power, precision voltage supervision for microprocessor-based systems, targeting battery-operated and space-constrained embedded devices where reliability, small size, and minimal quiescent current are critical.

FAQ

What is the exact reset threshold voltage of MAX6326XR22-T and how tightly is it specified?

The MAX6326XR22-T has a factory-trimmed nominal reset threshold of 2.20V, guaranteed to be within ±1.5% at +25°C and ±2.5% over the full –40°C to +85°C operating range. This precision ensures consistent brownout detection across temperature and unit-to-unit variation, critical for reliable operation in 2.5V digital systems where supply margins are tight.

Does MAX6326XR22-T require any external components to function?

No, the MAX6326XR22-T is fully self-contained and requires no external components. It integrates the voltage reference, comparator, timer, and push-pull output driver in a single SC70-3 package. Only a standard 0.1µF ceramic decoupling capacitor on the VCC pin is recommended for noise suppression-no resistors, capacitors, or trimming elements are needed for basic reset functionality.

How does the reset timeout behavior of MAX6326XR22-T work during power-up?

The MAX6326XR22-T asserts RESET low whenever VCC falls below 2.20V and holds it low for a minimum of 100ms after VCC rises above the threshold. The actual timeout ranges from 100ms to 280ms depending on temperature and process variation, ensuring sufficient time for microprocessor core, PLLs, and memory to stabilize before release-no external timing components are involved.

Can MAX6326XR22-T be used in systems with VCC below 2.5V, such as 1.8V logic rails?

Yes, the MAX6326XR22-T operates with VCC as low as 1.2V over temperature and maintains correct reset state down to 1.0V. While its 2.20V threshold is optimized for 2.5V/3.0V supplies, it remains functional in 1.8V systems for supervising higher-voltage auxiliary rails (e.g., 3.3V I/O or analog supplies) or as a secondary supervisor where the primary rail exceeds 2.2V.

Is MAX6326XR22-T pin-compatible with other common reset supervisors like MAX809?

Yes, the MAX6326XR22-T uses the standard 3-pin SC70-3 footprint (X3-2 outline) and shares identical pinout (GND, RESET, VCC) and electrical interface with MAX809/MAX810 series supervisors. This allows direct PCB-level replacement without layout changes, provided the reset threshold requirement (2.20V vs. MAX809's 2.63V or 2.93V) matches the target application's voltage monitoring needs.