Analog Devices Inc./Maxim Integrated MAX6327XR24-T

Overview

MAX6327XR24-T from Maxim Integrated is an active-high push-pull microprocessor supervisory circuit that monitors VCC supply voltage and asserts a reset signal when voltage falls below 2.40V, holding reset active for ≥100ms after recovery. It operates from 1.2V to 5.5V, draws ≤1µA supply current, and is housed in a 3-pin SC70-3 package for space-constrained portable and battery-powered systems.

For engineers reviewing the MAX6327XR24-T datasheet, MAX6327XR24-T pinout, MAX6327XR24-T application, or MAX6327XR24-T equivalent, key selection criteria include its factory-trimmed 2.40V reset threshold (±2.5% over –40°C to +85°C), active-high push-pull output, ultra-low power consumption, and immunity to fast VCC transients - critical for reliable µP reset in embedded controllers and intelligent instruments.

Technical Context

The MAX6327XR24-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 a minimum 100ms reset timeout after power-up or brownout recovery.

VCC-to-reset delay is ≤20µs for a 100mV undershoot, and the device remains fully functional down to VCC = 1.2V. The push-pull output drives high at ≥0.8·VCC (with 500µA source current) and low at ≤0.4V (with 1.2mA sink current when not asserted), enabling direct interface with µP reset inputs without external pull-ups.

Key Specifications

Pinout & Package

MAX6327XR24-T is packaged in a 3-pin SC70-3 (X3-2 outline), measuring 2.0mm × 2.1mm × 0.95mm, with gull-wing leads optimized for high-density PCB layouts and reflow compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6327XR24-T, the MAX6327UR24-T offers identical functionality in a larger SOT23-3 package for thermal or layout flexibility, while the TPS3124E trades ultra-low power for open-drain configurability - neither is pin-compatible, and both require board-level validation for replacement.

Availability

MAX6327XR24-T is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, smart energy meters, and IoT edge sensors requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6327XR24-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, mixed-signal, and power management ICs for industrial, automotive, and communications applications.

The MAX6326/MAX6327/MAX6328 family delivers ultra-low-power, factory-trimmed reset supervision for microprocessor-based systems where reliability, small size, and battery longevity are critical.

FAQ

What is the exact reset threshold voltage of the MAX6327XR24-T and how does it vary with temperature?

The MAX6327XR24-T has a nominal reset threshold of 2.40V at +25°C, with a tolerance of ±1.5%. Over the full operating temperature range of –40°C to +85°C, the threshold varies by ±2.5%, meaning the actual trip point stays within 2.34V to 2.46V. This stability is achieved using a precision bandgap reference and 40ppm/°C tempco design, ensuring predictable brownout response in varying environmental conditions. The MAX6327XR24-T is specified to maintain this performance without external calibration.

Does the MAX6327XR24-T require any external components to function as a reset supervisor?

No, the MAX6327XR24-T requires no external components to perform its core reset supervision function. Its factory-trimmed 2.40V threshold, internal timing capacitor, and push-pull output eliminate the need for resistors, capacitors, or trimming potentiometers. The device operates with only VCC, GND, and connection to the µP's reset input. This integration reduces BOM cost, PCB area, and design validation effort - a key advantage confirmed in the MAX6327XR24-T datasheet's "No External Components" feature listing.

What is the maximum supply voltage the MAX6327XR24-T can tolerate, and what happens below its minimum operating voltage?

The MAX6327XR24-T supports a VCC range of 1.2V to 5.5V. Absolute maximum rating is 6V, but operation above 5.5V is not guaranteed. Below 1.2V, the device may not assert reset correctly; however, it is guaranteed to hold a valid reset state down to VCC = 1.0V at room temperature and 1.2V across the full –40°C to +85°C range. This ensures fail-safe behavior during deep brownout - the MAX6327XR24-T will keep the µP held in reset until sufficient voltage is restored, preventing erratic execution.

How does the MAX6327XR24-T handle fast voltage transients on the VCC line?

The MAX6327XR24-T incorporates built-in transient immunity: its reset comparator ignores fast negative-going VCC glitches up to 100µs in duration when the overdrive (VTH – VCC) is 200mV. As overdrive increases, the allowable glitch width decreases per the "Maximum Transient Duration vs. Reset Threshold Overdrive" curve in the datasheet. This design prevents false resets caused by switching noise or ESD-induced dips - a verified behavior of the MAX6327XR24-T confirmed in Typical Operating Characteristics plots and Applications Information section.

Is the MAX6327XR24-T pin-compatible with other members of the MAX632x family, such as the MAX6326 or MAX6328?

Yes, the MAX6327XR24-T shares identical SC70-3 pinout (GND, RESET, VCC) and footprint with all MAX6326/MAX6327/MAX6328 variants, including MAX6326XR24-T and MAX6328XR24-T. However, output logic differs: MAX6327XR24-T provides active-high push-pull, while MAX6326XR24-T is active-low push-pull and MAX6328XR24-T is active-low open-drain. Swapping requires verifying µP reset pin polarity and drive strength - the MAX6327XR24-T cannot be substituted without circuit review due to its unique active-high assertion.