Analog Devices Inc./Maxim Integrated MAX6327UR27+T

Overview

MAX6327UR27+T from Maxim Integrated is an active-high push-pull microprocessor supervisory circuit designed to monitor VCC supply voltage and assert a reset signal during power-up, power-down, or brownout conditions. It features a factory-trimmed 2.70V reset threshold (±1.5% at +25°C, ±2.5% over -40°C to +85°C), 100ms minimum reset timeout, ultra-low 1µA max supply current, and operates down to 1.2V VCC. It is used in portable battery-powered systems requiring reliable, low-power reset supervision.

For engineers reviewing the MAX6327UR27+T datasheet, MAX6327UR27+T pinout, MAX6327UR27+T application, or MAX6327UR27+T equivalent, this page delivers verified electrical behavior, thermal stability data, SOT23-3 package compatibility, and precise reset timing characteristics essential for embedded µP power monitoring design validation.

Technical Context

The MAX6327UR27+T implements a precision bandgap-based reset comparator with built-in hysteresis (6.3mV) and internal timer logic to guarantee ≥100ms reset assertion after VCC rises above 2.70V. Its active-high push-pull output drives high (≥0.8·VCC at 500µA) when reset is inactive and low (≤0.4V at 1.2mA) when asserted.

It is fully specified across -40°C to +85°C, exhibits 40ppm/°C reset threshold tempco, and rejects fast VCC transients - immune to negative-going glitches ≤20µs at 100mV overdrive and ≤100µs at 10mV overdrive per typical operating curves.

Key Specifications

Pinout & Package

MAX6327UR27+T is housed in a RoHS-compliant 3-pin SOT23-3 package (outline 21-0051, land pattern 90-0179), measuring 2.92mm × 1.3mm × 1.0mm, suitable for high-density PCB layouts.

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 MAX6327UR27+T provides optimal balance of ultra-low power (1µA), precise 2.70V threshold, and push-pull simplicity - making it preferred for space-constrained, battery-critical 2.7V–3.0V systems where external components must be eliminated.

Availability

MAX6327UR27+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and smart energy meters requiring stable component supply, long-lifecycle assurance, and RoHS-compliant sourcing.

Supply support for MAX6327UR27+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/MAX6327/MAX6328 family was designed specifically for ultra-low-power, precision reset supervision in battery-operated and space-constrained embedded systems - emphasizing minimal external components, guaranteed timing, and robust noise immunity.

FAQ

What is the exact reset threshold voltage of MAX6327UR27+T and how stable is it over temperature?

The MAX6327UR27+T has a factory-trimmed nominal reset threshold of 2.70V, with ±1.5% tolerance at +25°C and ±2.5% over the full -40°C to +85°C operating range. Its 40ppm/°C tempco ensures total drift remains under ±15mV across temperature, and hysteresis of 6.3mV prevents oscillation near the trip point. This stability is confirmed in the Electrical Characteristics table of the official MAX6326–MAX6348 datasheet Rev 5.

Does MAX6327UR27+T support operation below 1.8V VCC, and what happens to reset behavior at low voltage?

Yes, MAX6327UR27+T is fully functional down to 1.2V VCC and guaranteed to maintain correct reset state (RESET low) for VCC as low as 1.0V. Below 1.2V, the device remains in reset but does not actively drive the output; above 1.2V, it resumes full comparator operation and timing control. This behavior is documented in the Absolute Maximum Ratings and Electrical Characteristics sections of the datasheet.

Is MAX6327UR27+T pin-compatible with other members of the MAX632x family, and can it replace MAX6327UR26+T on the same PCB?

Yes, MAX6327UR27+T is pin-compatible with all MAX6326/MAX6327/MAX6328 variants in SOT23-3 packaging, including MAX6327UR26+T. They share identical pinout (GND, RESET, VCC), footprint, and thermal characteristics. Only the reset threshold differs (2.70V vs. 2.63V); no PCB changes are required for substitution if system VCC margin accommodates the 70mV shift.

What is the maximum transient duration that MAX6327UR27+T can ignore without asserting reset?

Per the Typical Operating Characteristics graph "Maximum Transient Duration vs. Reset Threshold Overdrive", MAX6327UR27+T ignores negative-going VCC transients ≤20µs wide when the overdrive (VTH – VCC) is 100mV, and ≤100µs when overdrive is 10mV. This immunity is inherent to its internal comparator design and is validated across temperature - critical for operation in electrically noisy environments.

How does the active-high push-pull output of MAX6327UR27+T simplify interface compared to open-drain alternatives?

The active-high push-pull output of MAX6327UR27+T drives both high (≥0.8·VCC at 500µA) and low (≤0.4V at 1.2mA) without requiring an external pull-up resistor. This eliminates one passive component, reduces board area, avoids pull-up leakage errors, and ensures faster rise/fall times than open-drain equivalents like MAX6328UR27+T - simplifying µP reset pin interface in cost- and space-sensitive designs.