Analog Devices Inc./Maxim Integrated MAX6327UR22-T

Overview

MAX6327UR22-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 falls below 2.20V (±2.5% over temperature), maintains reset for ≥100ms after VCC recovers, operates down to 1.2V VCC, draws ≤1.0µA supply current at 3V, and is housed in a 3-pin SOT23-3 package for portable power monitoring applications.

For engineers reviewing the MAX6327UR22-T datasheet, MAX6327UR22-T pinout, MAX6327UR22-T application, or MAX6327UR22-T equivalent, this device serves as a precision, ultra-low-power reset supervisor for battery-powered µP systems requiring guaranteed reset assertion during brownout, power-up, and power-down events with factory-trimmed 2.2V threshold and transient immunity.

Technical Context

The MAX6327UR22-T implements a precision bandgap-based reset comparator with 40ppm/°C tempco and 6.3mV hysteresis to ensure stable threshold behavior across -40°C to +85°C. Its active-high push-pull output drives high (≥0.8·VCC) when asserted and low (≤0.4V at 1.2mA sink) when deasserted, eliminating external pull-up components.

It features built-in immunity to fast VCC transients-rejecting negative glitches up to 200µs at 200mV overdrive-and guarantees correct reset state down to VCC = 1.2V, enabling reliable operation in deep brownout conditions common in Li-ion and coin-cell powered systems.

Key Specifications

Pinout & Package

MAX6327UR22-T is packaged in a 3-pin SOT23-3 surface-mount package with 1.3mm × 2.9mm footprint, 0.95mm height, and standard JEDEC MO-178AC outline.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD2-T and TPS3808G01DBVR, the MAX6327UR22-T uniquely combines 2.20V precision threshold, active-high push-pull drive, guaranteed 1.2V operation, and sub-1µA ICC in one SOT23-3 package-making it optimal for space-constrained, long-life battery applications demanding deterministic low-voltage reset behavior.

Availability

MAX6327UR22-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter battery backup circuits, and automotive body control units requiring stable component supply with full traceability and lifecycle support.

Supply support for MAX6327UR22-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 and mixed-signal ICs for power, sensing, and interface applications, with emphasis on high-reliability, low-power solutions for industrial and portable markets.

The MAX6327UR22-T belongs to the MAX6326/MAX6327/MAX6328 family of ultra-low-power µP supervisory circuits, engineered specifically for battery-powered and energy-sensitive systems requiring guaranteed reset functionality without external components.

FAQ

What is the exact reset threshold voltage of MAX6327UR22-T and how does it vary with temperature?

The MAX6327UR22-T has a nominal reset threshold of 2.20V at +25°C, with factory trimming to ±1.5% tolerance at room temperature and ±2.5% over the full -40°C to +85°C operating range. Its temperature coefficient is 40ppm/°C, resulting in a maximum drift of ±22mV across the industrial temperature span-ensuring predictable brownout response in varying environmental conditions. This specification is fully guaranteed in the datasheet's Electrical Characteristics table.

Does MAX6327UR22-T require any external components to function as a reset supervisor?

No, the MAX6327UR22-T requires zero external components. It integrates a precision voltage reference, comparator, reset timer, and push-pull output driver in a single SOT23-3 package. Unlike discrete reset solutions, it eliminates the need for external resistors, capacitors, or pull-up networks-reducing PCB area, BOM cost, and assembly complexity while improving reliability in portable and space-constrained designs.

Can MAX6327UR22-T operate reliably when the supply voltage drops below 2.0V?

Yes, the MAX6327UR22-T is fully specified to operate and assert reset correctly down to VCC = 1.2V, well below 2.0V. This capability is guaranteed across temperature and ensures deterministic reset behavior during deep brownout events-critical for preserving data integrity in battery-powered systems where supply voltage may sag significantly before complete failure.

How does the active-high push-pull output of MAX6327UR22-T differ from open-drain alternatives?

The MAX6327UR22-T's active-high push-pull output actively drives high (≥0.8·VCC) when reset is asserted and low (≤0.4V) when released-requiring no external pull-up resistor. In contrast, open-drain supervisors like MAX6328UR22-T need a pull-up to define the high state, adding component count and potential noise susceptibility. This makes MAX6327UR22-T ideal for direct connection to µP reset inputs expecting active-high signaling.

Is MAX6327UR22-T compatible with lead-free soldering processes?

Yes, MAX6327UR22-T is available in lead-free packaging. The "-T" suffix denotes tape-and-reel packaging, and lead-free compliance is achieved by specifying "+T" instead of "-T" at order time. The device supports standard reflow profiles including JEDEC J-STD-020 moisture sensitivity level 1 and withstands lead-free soldering temperatures up to +300°C for 10 seconds, as confirmed in the Absolute Maximum Ratings table.