Analog Devices Inc./Maxim Integrated MAX6327XR26+T

Overview

MAX6327XR26+T from Maxim Integrated is an active-high push-pull microprocessor supervisory circuit that monitors VCC supply voltage and asserts a reset signal when VCC drops below 2.63V, maintaining reset for ≥100ms after VCC recovers; it operates from 1.2V to 5.5V, draws ≤1µA supply current, and is housed in a 3-pin SC70 package for portable and battery-powered systems.

For engineers reviewing the MAX6327XR26+T datasheet, MAX6327XR26+T pinout, MAX6327XR26+T application, or MAX6327XR26+T equivalent, key selection considerations include its factory-trimmed 2.63V reset threshold (±2.5% over –40°C to +85°C), active-high push-pull output with 0.8·VCC VOH, 100ms minimum reset timeout, immunity to fast VCC transients, and compatibility with 2.5V/3V/3.3V/5V digital systems.

Technical Context

The MAX6327XR26+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 power-up reset pulse width and suppresses false triggers during VCC glitches up to 200µs at 200mV overdrive.

Designed for ultra-low-power operation, the device achieves ≤1µA ICC at 3V and remains functional down to VCC = 1.2V, with full specification over –40°C to +85°C. The push-pull output drives high (VOH ≥ 0.8·VCC) when reset is inactive and low (VOL ≤ 0.4V at 1.2mA) when asserted, eliminating external pull-up components.

Key Specifications

Pinout & Package

Package: 3-pin SC70-3 (outline X3-2), footprint-compatible with SOT23-3 but smaller footprint (1.25mm × 1.25mm × 0.9mm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD2+T and TPS3808G125DBVR, the MAX6327XR26+T uniquely combines active-high push-pull drive, 1µA max ICC, and SC70-3 size-enabling compact, low-power designs where reset polarity and board area are critical constraints.

Availability

MAX6327XR26+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 and long-term lifecycle support.

Supply support for MAX6327XR26+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, computing, and communications applications.

The MAX6327XR26+T belongs to Maxim's ultra-low-power µP supervisory family, engineered specifically for battery-operated and space-constrained systems requiring guaranteed reset assertion during brownout, power-up, and transient events.

FAQ

What is the exact reset threshold voltage of the MAX6327XR26+T and how does it vary with temperature?

The MAX6327XR26+T has a factory-trimmed nominal reset threshold of 2.63V at +25°C, with 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 threshold drift is limited to approximately ±10.5mV across the entire temperature span-ensuring predictable brownout response in thermal cycling environments.

Does the MAX6327XR26+T require any external components to function?

No, the MAX6327XR26+T requires zero external components. It integrates a precision voltage reference, comparator, timing capacitor, and push-pull output driver. Unlike discrete reset solutions, this eliminates the need for external resistors, capacitors, or diodes-reducing BOM count, PCB area, and qualification effort while improving reliability.

What is the maximum VCC voltage the MAX6327XR26+T can tolerate, and what happens below minimum VCC?

The MAX6327XR26+T supports VCC from 1.2V to 5.5V per specifications, with absolute maximum rating of 6V. Below 1.2V, the device is not guaranteed to assert reset correctly; however, it remains functional down to 1.0V at 0°C to +70°C per Absolute Maximum Ratings. For robust operation across –40°C to +85°C, maintain VCC ≥1.2V.

How does the MAX6327XR26+T handle fast VCC transients, and what is its immunity limit?

The MAX6327XR26+T incorporates comparator hysteresis and internal filtering to reject fast VCC transients. It ignores negative-going glitches ≤200µs in duration when the overdrive (VTH – VCC) is 200mV. As overdrive increases, allowable glitch width decreases-e.g., at 100mV overdrive, max transient duration is ~400µs-preventing false resets in noisy power environments.

Is the MAX6327XR26+T pin-compatible with other members of the MAX632x family?

Yes, the MAX6327XR26+T shares identical pinout (GND, RESET, VCC) and SC70-3 package with all MAX6326/MAX6327/MAX6328 variants. However, output polarity differs: MAX6327/MAX6347 provide active-high push-pull, while MAX6326/MAX6346 are active-low push-pull and MAX6328/MAX6348 are active-low open-drain-so direct substitution requires verification of reset polarity and drive strength requirements.