Analog Devices Inc./Maxim Integrated MAX6326XR27-T

Overview

MAX6326XR27-T from Maxim Integrated is an ultra-low-power, active-low push-pull microprocessor supervisory circuit that monitors VCC supply voltage and asserts a reset signal when voltage drops below 2.70V (±2.5% over temperature), maintaining reset for ≥100ms after recovery. It operates from 1.2V to 5.5V, draws ≤1.0µA at 3V, and is housed in a 3-pin SC70-3 package for space-constrained portable and embedded systems.

For engineers reviewing the MAX6326XR27-T datasheet, MAX6326XR27-T pinout, MAX6326XR27-T application, or MAX6326XR27-T equivalent, this device serves as a precision power-on/brownout reset supervisor for 2.5V–5V digital systems requiring guaranteed reset assertion down to 1V VCC, transient immunity, and no external components.

Technical Context

The MAX6326XR27-T implements a factory-trimmed bandgap-based reset comparator with 6.3mV hysteresis and 40ppm/°C tempco, ensuring stable threshold behavior across -40°C to +85°C. Its internal logic guarantees correct reset state down to 1V VCC and ignores fast transients via built-in noise immunity.

It features a push-pull active-low RESET output capable of sourcing 500µA at 0.8·VCC and sinking 1.6mA at ≤0.3V - eliminating need for external pull-up resistors. The device requires no external timing components and delivers a minimum 100ms reset timeout after power-up.

Key Specifications

Pinout & Package

MAX6326XR27-T is packaged in a 3-pin SC70-3 (X3-2 outline), with 0.65mm pitch and exposed pad not connected. Pin 1 = GND, Pin 2 = RESET (active-low push-pull), Pin 3 = VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3-T and TPS3808G125DBVR, the MAX6326XR27-T provides tighter threshold accuracy (±2.5% vs ±3%), lower quiescent current (1.0µA vs 1.2–1.8µA), and eliminates external components - making it optimal for precision 3V-system reset where board space and battery life are constrained.

Availability

MAX6326XR27-T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, network edge routers, smart energy meters, and battery-backed embedded systems requiring stable component supply and long-term lifecycle support.

Supply support for MAX6326XR27-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 industrial, automotive, communications, and computing applications, with emphasis on power efficiency and integration.

The MAX6326 family delivers ultra-low-power, factory-trimmed reset supervision for microprocessor-based systems where reliability, small size, and minimal external components are essential design goals.

FAQ

What is the exact reset threshold voltage of MAX6326XR27-T and how does it vary with temperature?

The MAX6326XR27-T has a nominal reset threshold of 2.70V at +25°C, with ±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, meaning threshold drift is limited to approximately ±13.5mV across the entire temperature span - ensuring consistent brownout detection in varying environmental conditions. This specification is guaranteed by design and verified per the Electrical Characteristics table in the official datasheet.

Does MAX6326XR27-T require any external components to function?

No, the MAX6326XR27-T operates autonomously with no external components required. It integrates the voltage reference, comparator, timer, and push-pull output driver into a single SC70-3 package. Unlike open-drain supervisors, its active-low push-pull RESET output eliminates the need for an external pull-up resistor - simplifying layout, reducing BOM count, and improving noise immunity in high-density PCBs.

Can MAX6326XR27-T operate reliably at VCC voltages below 2.7V?

Yes, the MAX6326XR27-T is fully functional down to 1.2V VCC over temperature and guaranteed to maintain correct reset state (asserted or de-asserted) for VCC as low as 1.0V. This allows safe operation during deep brownout events and enables robust power-fail detection in systems where the supply may dip below the 2.70V threshold before complete collapse - a key feature for flash-safe microcontroller boot sequences.

What is the maximum transient duration the MAX6326XR27-T can ignore without issuing a false reset?

The MAX6326XR27-T suppresses false resets from negative-going VCC transients up to 100µs in duration when the overdrive (VTH – VCC) is 200mV, as shown in the Typical Operating Characteristics graph "Maximum Transient Duration vs. Reset Threshold Overdrive". At smaller overdrives (e.g., 20mV), it tolerates transients up to ~170µs - providing robust immunity against switching regulator noise and coupling spikes common in dense power systems.

Is MAX6326XR27-T pin-compatible with other members of the MAX6326/MAX6327/MAX6328 family?

Yes, all MAX6326XRxx-T, MAX6327XRxx-T, and MAX6328XRxx-T variants share identical SC70-3 pinout (GND/RESET/VCC), enabling drop-in replacement across reset threshold and output polarity variants. However, MAX6326XR27-T (push-pull active-low) is not functionally interchangeable with MAX6327XR27-T (push-pull active-high) or MAX6328XR27-T (open-drain active-low) without circuit modification - output behavior must match host processor reset pin requirements.