Analog Devices Inc./Maxim Integrated MAX6326XR26

Overview

MAX6326XR26 from Maxim Integrated is an ultra-low-power, active-low push-pull microprocessor supervisory circuit designed to monitor 2.63V power supplies and assert a reset signal during brownout or power-up conditions. It features a factory-trimmed 2.63V reset threshold (±1.5% at +25°C), 100ms minimum reset timeout, 1µA max supply current at +25°C, and operation down to 1V VCC - making it suitable for battery-powered embedded controllers requiring reliable power-on reset in space-constrained SOT23-3 designs.

For engineers reviewing the MAX6326XR26 datasheet, MAX6326XR26 pinout, MAX6326XR26 application, or MAX6326XR26 equivalent, this device serves as a precision voltage-monitoring reset supervisor with transient immunity, no external components, and compatibility with legacy µP reset interfaces requiring active-low push-pull output.

Technical Context

The MAX6326XR26 implements a precision bandgap-based voltage comparator with hysteresis (9.5mV typical) to detect VCC falling below its 2.63V threshold and hold RESET low for ≥100ms after VCC recovers. Its internal reset timer is fully specified across –40°C to +85°C and immune to transients ≤200µs at 100mV overdrive.

This variant belongs to the MAX6326 family of push-pull active-low reset ICs, distinct from MAX6327 (active-high push-pull) and MAX6328 (open-drain). All share identical SC70-3/SOT23-3 packaging, 1µA max ICC, and 2.2V–4.63V factory-trimmable thresholds in ~100mV steps.

Key Specifications

Pinout & Package

MAX6326XR26 is housed in a 3-pin SOT23-3 package (JEDEC MO-178AA), with 1.3mm × 2.9mm footprint and 0.95mm height - optimized for high-density portable PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TR26-T and TPS3808G12QDBVRQ1, MAX6326XR26 delivers tighter threshold accuracy (±1.5% vs. ±2.5%), lower ICC (1µA vs. ≥1.2µA), and guaranteed functionality down to 1V - making it optimal for long-life portable and industrial edge devices where power and brownout margin are design-critical.

Availability

MAX6326XR26 is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial controller reset circuits, and automotive body electronics requiring stable component supply and long-term manufacturability.

Supply support for MAX6326XR26 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 consumer applications.

The MAX6326 family was engineered specifically for ultra-low-power microprocessor reset supervision in space- and energy-constrained systems - emphasizing precision voltage monitoring, minimal quiescent current, and robust transient rejection without external components.

FAQ

What is the exact reset threshold voltage of MAX6326XR26 and how tightly is it specified?

The MAX6326XR26 has a factory-trimmed reset threshold of 2.63V, with a tolerance of ±1.5% at +25°C and ±2.5% over the full –40°C to +85°C operating range. This precision eliminates need for external resistor networks and ensures consistent brownout detection across temperature and unit-to-unit variation - a key requirement for reliable MAX6326XR26 deployment in mission-critical embedded systems.

Does MAX6326XR26 require any external components to function as a reset supervisor?

No, MAX6326XR26 operates as a fully self-contained reset supervisor with no external components required. Its internal precision voltage reference, comparator, and reset timer are integrated into the die. The push-pull output drives the µP RESET line directly - unlike open-drain alternatives that mandate an external pull-up resistor - reducing BOM count, board area, and potential failure points in the MAX6326XR26 application.

What is the minimum VCC voltage at which MAX6326XR26 remains functional and asserts reset correctly?

MAX6326XR26 is guaranteed to operate correctly and assert reset down to VCC = 1.0V. This deep-brownout capability ensures reliable reset generation even during severe supply droop or ultra-low-voltage wake-up sequences - a distinguishing feature versus many competing supervisors that cease functioning below 1.2V or 1.5V. This behavior is fully characterized and specified for MAX6326XR26 across temperature.

How does the reset timeout duration of MAX6326XR26 behave across temperature and supply voltage?

The MAX6326XR26 guarantees a minimum reset timeout of 100ms after VCC rises above the 2.63V threshold, with typical values of 185ms at +25°C and up to 280ms at +85°C. This monotonic increase with temperature ensures conservative reset timing under worst-case thermal conditions - critical for robust MAX6326XR26 integration in industrial and automotive environments where µP boot timing margins are tight.

Is MAX6326XR26 pin-compatible with other members of the MAX6326/MAX6327/MAX6328 family?

Yes, MAX6326XR26 shares identical pinout (VCC, RESET, GND), package (SOT23-3/SC70-3), and footprint with all MAX6326, MAX6327, and MAX6328 variants. The only functional difference is reset polarity and output structure: MAX6326XR26 is active-low push-pull, while MAX6327 variants are active-high and MAX6328 variants are open-drain. This allows direct substitution within the same physical layout when reset logic is compatible - a verified design flexibility of the MAX6326XR26 family.