Analog Devices Inc./Maxim Integrated MAX6328XR26-T

Overview

MAX6328XR26-T from Maxim Integrated is an ultra-low-power open-drain microprocessor supervisory circuit that monitors VCC supply voltage and asserts an active-low reset signal when voltage falls below 2.63V (±2.5% over temperature), maintaining reset for ≥100ms after recovery. It operates from 1.2V to 5.5V, draws ≤1µA supply current at 3V, and is housed in a 3-pin SC70-3 package for space-constrained portable and battery-powered systems.

For engineers reviewing the MAX6328XR26-T datasheet, MAX6328XR26-T pinout, MAX6328XR26-T application, or MAX6328XR26-T equivalent, this device serves as a precision brownout detector with transient immunity, factory-trimmed reset threshold, and compatibility with bidirectional µP reset pins - critical for reliable power-on initialization and system fault recovery in embedded controllers and intelligent instruments.

Technical Context

The MAX6328XR26-T implements a precision bandgap-based reset comparator with 40ppm/°C tempco and 6.3mV hysteresis, ensuring stable threshold behavior across -40°C to +85°C. Its open-drain RESET output supports flexible pull-up configurations and interfaces directly with µPs like the Motorola 68HC11 via a single external resistor.

It features immunity to fast VCC transients (up to 100V/µs slew rate), guaranteed correct state down to 1V VCC, and no external components required. The reset timeout is internally timed and fully specified over temperature without reliance on external RC networks.

Key Specifications

Pinout & Package

MAX6328XR26-T is supplied in a 3-pin SC70-3 package (outline X3-2, land pattern 90-0208), with 0.65mm pitch and exposed pad not present. Pin 1 = GND, Pin 2 = RESET (open-drain), Pin 3 = VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6328XR26-T, MAX809TRD2-T offers higher supply current and fixed push-pull drive but lacks open-drain versatility, while TPS3808G125DBVR trades component-free operation for adjustability and extended timeout - making MAX6328XR26-T optimal for compact, ultra-low-power, and multi-device reset bus designs.

Availability

MAX6328XR26-T is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-powered data loggers, and medical point-of-care devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6328XR26-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 connectivity applications, with emphasis on reliability and integration.

The MAX6326/MAX6327/MAX6328 family delivers ultra-low-power, factory-trimmed reset supervision for microprocessor-based systems where size, battery life, and immunity to supply noise are critical design constraints.

FAQ

What is the exact reset threshold voltage of MAX6328XR26-T and how does it vary with temperature?

The MAX6328XR26-T has a 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 tempco is 40ppm/°C, meaning threshold drift is bounded and predictable - for example, at +85°C, the threshold remains within 2.564V to 2.696V per datasheet Table 1. This precision eliminates need for external trimming.

Does MAX6328XR26-T require any external components to function?

No, MAX6328XR26-T operates autonomously with no external components required. Its internal bandgap reference, comparator, and timer eliminate the need for RC networks or trimming resistors. Only an external pull-up resistor on the open-drain RESET pin is needed for proper logic-level translation - a standard design practice, not a functional dependency.

Can MAX6328XR26-T interface directly with a microcontroller that has a bidirectional reset pin?

Yes, MAX6328XR26-T's open-drain RESET output is specifically designed for direct interfacing with bidirectional µP reset pins such as those found on the Motorola 68HC11. By connecting RESET to the µP's reset pin with a single pull-up resistor, either device can assert reset - enabling coordinated system-level fault recovery without additional logic or isolation.

What is the maximum VCC slew rate that MAX6328XR26-T can tolerate without generating false resets?

MAX6328XR26-T is rated for VCC slew rates up to 100V/µs, as specified in Absolute Maximum Ratings. Its reset comparator incorporates built-in transient immunity, rejecting negative-going VCC glitches shorter than ~100µs (depending on overdrive magnitude). This ensures robust operation in electrically noisy environments like motor drives or switch-mode power supplies.

Is MAX6328XR26-T pin-compatible with other members of the MAX632x family?

Yes, MAX6328XR26-T shares identical SC70-3 pinout (GND/RESET/VCC) with all MAX6326/MAX6327/MAX6328 variants in XR package, including MAX6328XR22-T through MAX6328XR31-T. This allows drop-in replacement across threshold voltages without PCB modification - provided the open-drain output requirement is maintained in the target design.