Analog Devices Inc./Maxim Integrated MAX6802UR26D3

Overview

MAX6802UR26D3 from Maxim Integrated is an open-drain, active-low microprocessor supervisory circuit designed to monitor 2.63V power supplies in embedded systems. It asserts reset when V_CC falls below 2.63V, maintains reset for ≥100ms after recovery, draws only 5µA typical supply current, and operates down to V_CC = 1.0V - enabling reliable brownout detection in battery-powered controllers and automotive ECUs.

For engineers reviewing the MAX6802UR26D3 datasheet, MAX6802UR26D3 pinout, MAX6802UR26D3 application, or MAX6802UR26D3 equivalent, key selection criteria include its factory-trimmed 2.63V reset threshold, 100ms minimum timeout, open-drain output architecture for bidirectional µP reset pin interfacing, guaranteed operation to 1.0V V_CC, and SOT23-3 package compatibility with legacy supervisors.

Technical Context

The MAX6802UR26D3 implements a precision bandgap-based voltage comparator with factory-trimmed 2.63V threshold (±3% over –40°C to +125°C) and built-in hysteresis to reject fast transients up to 100µs at 20mV overdrive. Its internal timer generates a fixed ≥100ms reset pulse width after V_CC exceeds threshold, independent of external components.

This device uses BiCMOS process technology and features an open-drain RESET output capable of sinking 1.2mA at V_CC ≥ 2.5V while maintaining <0.3V low-level voltage. It requires an external pullup resistor and supports direct interface with bidirectional reset pins (e.g., Motorola 68HC11), unlike push/pull variants.

Key Specifications

Pinout & Package

MAX6802UR26D3 is housed in a 3-pin SOT23 package (U3-1 outline, land pattern 90-0179), with 1.3mm × 2.9mm footprint and 0.95mm height - optimized for space-constrained PCB layouts in portable and automotive modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3-T and TPS3808G125DBVR, the MAX6802UR26D3 uniquely combines a precise 2.63V factory-trimmed threshold, open-drain output for bidirectional reset buses, and guaranteed operation down to 1.0V - making it optimal for 2.85V–3.3V automotive and portable systems requiring glitch-immune brownout protection without external components.

Availability

MAX6802UR26D3 is available at Aetrix Electronics and suitable for automotive engine control units, portable medical instrumentation, industrial PLC I/O modules, smart energy meters, and battery-backed data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6802UR26D3 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, automotive, communications, and computing applications.

The MAX6800/MAX6801/MAX6802 family delivers ultra-low-power, pin-compatible µP supervisory circuits with factory-trimmed thresholds and fixed timeouts - engineered for cost-sensitive, space-constrained embedded systems needing reliable power-monitoring without external components.

FAQ

What is the exact reset threshold voltage for MAX6802UR26D3?

The MAX6802UR26D3 has a factory-trimmed reset threshold of 2.63V, specified with ±3% tolerance over the full –40°C to +125°C temperature range. At +25°C, the typical value is exactly 2.63V, and the datasheet guarantees operation between 2.551V (min) and 2.709V (max) across temperature. This precise threshold enables reliable brownout detection in 2.85V systems without external calibration.

Does MAX6802UR26D3 support operation down to 0V V_CC?

No, the MAX6802UR26D3 is guaranteed to maintain correct reset state only down to V_CC = 1.0V - unlike the MAX6800/MAX6801 variants which operate to 0.7V. Below 1.0V, the open-drain output's sinking capability degrades significantly, and RESET may drift to indeterminate levels due to leakage and pullup dominance. For 0V-valid reset, a MAX6801 with external pulldown is recommended instead.

What is the required external component for MAX6802UR26D3?

The MAX6802UR26D3 requires only one external component: a pullup resistor on the RESET pin. Typical values range from 10kΩ to 100kΩ, connected between RESET (pin 2) and the monitored V_CC rail (or another compatible logic rail). No capacitors, dividers, or additional ICs are needed - fulfilling the "no external components required" design goal for space- and cost-sensitive applications.

How does the 100ms reset timeout of MAX6802UR26D3 compare to other versions in the family?

The "D3" suffix in MAX6802UR26D3 denotes a factory-programmed 100ms minimum reset timeout period - the longest option available in the MAX6800/01/02 family. Other versions include D1 (1ms min) and D2 (20ms min). The 100ms timeout ensures robust initialization of complex µPs and peripherals, especially in automotive and industrial systems where power stabilization takes longer after cold crank or line recovery.

Is MAX6802UR26D3 pin-compatible with industry-standard supervisors?

Yes, the MAX6802UR26D3 uses the standard 3-pin SOT23 package and shares identical pinout (GND, RESET, V_CC) with MAX809/MAX810, MAX6326–MAX6328, and MAX6346–MAX6348. This allows direct PCB replacement in existing designs without layout changes - provided the application accepts open-drain output behavior and the 2.63V threshold meets system requirements.