Analog Devices Inc./Maxim Integrated MAX6326XR23+

Overview

MAX6326XR23+ from Maxim Integrated is an ultra-low-power, active-low push-pull microprocessor supervisory circuit designed to monitor 2.5V–5V power supplies and assert a reset signal during brownout or power-up conditions. It features a factory-trimmed 2.32V reset threshold (±2.5% over –40°C to +85°C), 100ms minimum reset timeout, 1µA max supply current at +25°C, and operates down to 1.2V VCC. It is used in portable battery-powered systems requiring reliable, low-quiescent-power reset assertion.

For engineers reviewing the MAX6326XR23+ datasheet, MAX6326XR23+ pinout, MAX6326XR23+ application, or MAX6326XR23+ equivalent, key selection criteria include reset threshold accuracy, push-pull output drive capability, SC70-3 package footprint compatibility, and guaranteed operation down to 1.2V VCC for low-voltage microcontroller systems.

Technical Context

The MAX6326XR23+ uses a precision bandgap-based voltage comparator with hysteresis (6.3mV) to detect VCC falling below its 2.32V threshold. Its internal timing circuit ensures a minimum 100ms reset pulse width after VCC rises above threshold, independent of supply ramp rate.

It employs a push-pull output stage capable of sourcing ≥500µA at 0.8·VCC and sinking ≥1.6mA at ≤0.3V - eliminating external pull-up resistors. The device ignores fast VCC transients (<20µs at 100mV overdrive) and is fully specified across –40°C to +85°C.

Key Specifications

Pinout & Package

MAX6326XR23+ is housed in a 3-pin SC70-3 package (outline 21-0075, land pattern 90-0208), with 0.65mm pitch and exposed pad not connected. 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 MAX6326XR23+, MAX809TRD2+T trades ultra-low power for lower cost, while TPS3808G12DBVR offers programmability at the expense of higher ICC and external component dependency - making MAX6326XR23+ optimal for space- and battery-constrained embedded systems demanding guaranteed sub-1.5V operation and zero-external-component simplicity.

Availability

MAX6326XR23+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and smart meter data loggers requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6326XR23+ 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, mixed-signal, and power-management ICs for industrial, medical, and communications applications.

The MAX6326 family delivers ultra-low-power, factory-trimmed reset supervision for battery-operated and space-constrained microcontroller systems - prioritizing reliability, minimal external components, and guaranteed operation across wide voltage and temperature ranges.

FAQ

What is the exact reset threshold voltage of MAX6326XR23+ and how does it vary with temperature?

The MAX6326XR23+ has a nominal reset threshold of 2.32V at +25°C, with a tolerance of ±1.5% at room temperature and ±2.5% over the full –40°C to +85°C operating range. Its temperature coefficient is 40ppm/°C, meaning the threshold drifts by approximately ±0.0093V across the industrial temperature span - verified in the Electrical Characteristics table and Typical Operating Characteristics plots.

Does MAX6326XR23+ require any external components to function as a reset supervisor?

No, MAX6326XR23+ requires zero external components. Its push-pull active-low RESET output drives the microcontroller reset pin directly without a pull-up resistor. The internal voltage reference, comparator, and timing circuit are fully integrated - confirmed in the General Description and Features sections, which explicitly state "No External Components" as a key benefit.

What is the minimum VCC voltage at which MAX6326XR23+ guarantees correct reset assertion?

MAX6326XR23+ guarantees correct reset assertion down to 1.0V VCC at +25°C and down to 1.2V VCC across the full –40°C to +85°C temperature range. This is documented in the Absolute Maximum Ratings and Electrical Characteristics tables under "VCC Range", ensuring fail-safe behavior during deep brownout conditions.

How does the reset timeout period of MAX6326XR23+ behave across temperature?

The MAX6326XR23+ provides a minimum 100ms reset timeout after VCC rises above threshold, with typical values ranging from 100ms to 280ms depending on temperature and process variation. The datasheet specifies 100ms (min), 185ms (typ), and 280ms (max) across –40°C to +85°C - shown in the Electrical Characteristics table under "Reset Active Timeout Period".

Is MAX6326XR23+ pin-compatible with legacy Maxim reset supervisors like MAX809?

Yes, MAX6326XR23+ is pin-compatible with MAX809/MAX810 in SC70-3 and SOT23-3 packages, sharing identical 3-pin pinout (GND, RESET, VCC) and footprint dimensions. This is explicitly stated in the Applications section and Selector Guide, enabling drop-in replacement where ultra-low ICC and extended VCC range are needed.