Analog Devices Inc./Maxim Integrated MAX6327XR23+T

Overview

MAX6327XR23+T from Maxim Integrated is an active-high push-pull microprocessor supervisory circuit designed to monitor 2.32V power supplies and assert a reset signal during brownout, power-up, and power-down events. It guarantees correct operation down to 1V VCC, delivers ≤1µA supply current at 3V, maintains ≥100ms reset timeout after VCC recovery, and features factory-trimmed 2.32V reset threshold with ±1.5% accuracy at +25°C. It is used in portable battery-powered controllers requiring ultra-low-power voltage monitoring.

For engineers reviewing the MAX6327XR23+T datasheet, MAX6327XR23+T pinout, MAX6327XR23+T application, or MAX6327XR23+T equivalent, this page provides verified functional identity, SC70-3 package mapping, confirmed active-high push-pull output behavior, temperature-stable reset timing (–40°C to +85°C), and validated alternatives for 2.32V µP reset supervision.

Technical Context

The MAX6327XR23+T implements a precision bandgap-based reset comparator with 40ppm/°C tempco and 6.3mV hysteresis to reject fast VCC transients. Its internal logic ensures RESET remains high while VCC is below 2.32V and holds that state for ≥100ms after VCC rises above threshold - independent of VCC slew rate up to 100V/µs.

This device operates across full industrial temperature range (–40°C to +85°C) with guaranteed performance at VCC as low as 1.2V. The push-pull output drives high with 0.8·VCC VOH (ISOURCE = 500µA, VCC ≥ 2.1V) and low with 0.3V VOL (ISINK = 1.2mA, VCC ≥ 3.2V), enabling direct interface with 3.3V and 5V µP reset inputs without external pull-ups.

Key Specifications

Pinout & Package

MAX6327XR23+T is housed in a 3-pin SC70-3 package (outline X3-2, land pattern 90-0208), measuring 2.0mm × 2.1mm × 0.9mm with gull-wing leads. This RoHS-compliant, lead-free package supports reflow soldering and high-density placement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6327UR23+T, the MAX6327XR23+T saves 35% board area with identical function; versus MAX809TR23+T, it delivers 10× lower supply current and 0.3V deeper brownout immunity - critical for long-life and automotive-grade designs.

Availability

MAX6327XR23+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-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6327XR23+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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and computing markets.

The MAX6326/MAX6327/MAX6328 family was designed specifically for ultra-low-power microprocessor reset supervision in battery-critical and thermally constrained applications, emphasizing precision threshold accuracy, minimal ICC, and robust transient immunity.

FAQ

What is the exact reset threshold voltage of MAX6327XR23+T?

The MAX6327XR23+T has a factory-trimmed nominal reset threshold of 2.32V, with ±1.5% tolerance at +25°C and ±2.5% over the full –40°C to +85°C operating range. This value is confirmed in Table 1 of the official datasheet under suffix "R23", and applies exclusively to the MAX6327 variant's active-high push-pull output configuration. The MAX6327XR23+T does not support user adjustment.

Does MAX6327XR23+T require external components to operate?

No, the MAX6327XR23+T requires no external components - it integrates the precision voltage reference, comparator, timer, and push-pull driver on-die. Unlike discrete supervisor solutions, it needs only VCC, GND, and the RESET output connection to the microprocessor. This eliminates external resistors, capacitors, or pull-up networks, reducing BOM cost and PCB area while improving reliability. The MAX6327XR23+T achieves full functionality with zero external parts.

What is the supply current consumption of MAX6327XR23+T at 3.3V?

The MAX6327XR23+T draws ≤1.0µA maximum supply current at 3.3V and +25°C, with typical consumption of 0.5µA. This ultra-low ICC is measured under no-load conditions and is guaranteed across the full industrial temperature range. At 5.5V, ICC remains ≤1.75µA. This performance enables multi-year operation from primary lithium cells in applications such as wireless sensors and portable diagnostics where MAX6327XR23+T is deployed.

Can MAX6327XR23+T operate reliably below 2.0V VCC?

Yes, the MAX6327XR23+T is fully specified down to 1.2V VCC over –40°C to +85°C and guaranteed functional to 1.0V at +25°C. Its internal circuitry remains active and correctly asserts RESET even when VCC collapses to 1.2V - a key differentiator from competitors like MAX809 that specify only down to 1.5V. This capability ensures deterministic reset behavior during severe brownout events in systems powered by aging batteries or poorly regulated supplies, making MAX6327XR23+T suitable for mission-critical embedded supervision.

Is MAX6327XR23+T pin-compatible with MAX809 series devices?

The MAX6327XR23+T shares identical pinout (GND, RESET, VCC) and SC70-3 package dimensions with MAX809TR23+T, enabling drop-in replacement in many layouts. However, due to differences in output drive strength, reset timeout consistency, and low-VCC behavior, full functional equivalence requires validation in the target application. The MAX6327XR23+T offers superior 1µA ICC and 1.2V operation versus MAX809's 10µA and 1.5V minimum, so design review is recommended before substitution.