Analog Devices Inc./Maxim Integrated MAX6385XS26D3

Overview

MAX6385XS26D3 from Maxim Integrated is a low-power, active-high push-pull microprocessor supervisory circuit with factory-set 2.63V reset threshold, 140ms minimum reset timeout, manual reset input (MR), and 4-pin SC70 package. It monitors VCC in battery-powered and low-voltage embedded systems, asserts RESET when VCC drops below 2.63V, and holds reset for ≥140ms after VCC recovers. Designed for reliable power-up/brownout detection in portable instrumentation.

For engineers reviewing the MAX6385XS26D3 datasheet, MAX6385XS26D3 pinout, MAX6385XS26D3 application, or MAX6385XS26D3 equivalent, key selection criteria include its ±2.5% threshold accuracy over –40°C to +125°C, guaranteed valid output down to VCC = 1V, 3µA supply current at 1.8V, MR debounced internal pullup (63kΩ), and immunity to negative-going VCC transients.

Technical Context

The MAX6385XS26D3 implements a precision bandgap-based voltage comparator with ±2.5% reset threshold tolerance across full temperature range, paired with a monotonic RC timer for deterministic 140ms reset assertion after VCC recovery. Its active-high push-pull RESET output drives directly into µP reset inputs without external pullup.

It integrates a debounced manual reset input (MR) with internal 63kΩ pullup to VCC, enabling momentary switch interfacing without external components. The device operates from 1.0V to 5.5V supply and guarantees correct logic state of RESET down to VCC = 1V - critical for ultra-low-voltage brownout detection.

Key Specifications

Pinout & Package

MAX6385XS26D3 is housed in a lead-free 4-pin SC70 package (package code X4-1), measuring 1.25mm × 0.85mm × 0.55mm, suitable for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6385LT26D3, the MAX6385XS26D3 saves 0.6mm² board area and simplifies assembly for ultra-compact designs; versus TPS3126E18DBVR, it delivers application-specific 2.63V threshold and integrated MR - eliminating two external components and enabling direct switch integration.

Availability

MAX6385XS26D3 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart metering subsystems, and wearable fitness trackers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6385XS26D3 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, automotive, and communications markets.

The MAX6381–MAX6390 family was designed specifically for low-power, precision voltage supervision in space- and energy-constrained embedded systems - delivering factory-trimmed thresholds, sub-µA quiescent current, and robust glitch immunity in miniature packages.

FAQ

What is the exact reset threshold voltage of the MAX6385XS26D3?

The MAX6385XS26D3 has a factory-set reset threshold of 2.63V, with guaranteed tolerance of ±2.5% over the full operating temperature range of –40°C to +125°C. This value is laser-trimmed during production and does not require external configuration. The "26" suffix in MAX6385XS26D3 explicitly denotes the 2.63V threshold per Maxim's ordering guide.

Does the MAX6385XS26D3 support manual reset, and how is it implemented?

Yes, the MAX6385XS26D3 features an active-low manual reset input (MR) on Pin 3. It includes an internal 63kΩ pullup resistor to VCC, allowing direct connection of a normally open momentary switch between MR and GND. No external components are needed - releasing the switch automatically initiates a 140ms reset timeout period, matching the VCC reset timing.

What package type and dimensions does the MAX6385XS26D3 use?

The MAX6385XS26D3 uses a lead-free 4-pin SC70 package (package code X4-1), with outline dimensions of 1.25mm × 0.85mm × 0.55mm. Its compact size and gull-wing leads support fine-pitch reflow assembly, making it ideal for high-density portable PCBs where board space is at a premium.

Can the MAX6385XS26D3 operate reliably at very low supply voltages?

Yes, the MAX6385XS26D3 guarantees correct RESET output logic state down to VCC = 1.0V. This ensures deterministic brownout response even during deep undervoltage events. Its operating range extends from 1.0V to 5.5V, and supply current remains as low as 3µA at 1.8V - enabling use in ultra-low-power applications like coin-cell–powered sensors.

How does the MAX6385XS26D3 handle short VCC transients or noise?

The MAX6385XS26D3 provides inherent immunity to negative-going VCC transients: it will not assert reset for glitches ≤35µs wide when the overdrive (VTH – VCC) is 100mV. This is achieved through internal filtering and comparator hysteresis. For enhanced immunity, Maxim recommends placing a 0.1µF ceramic capacitor close to the VCC pin.