Analog Devices Inc./Maxim Integrated MAX6381XR23D2+T

Overview

MAX6381XR23D2+T from Maxim Integrated is a low-power microprocessor supervisory circuit in 3-pin SC70 package, featuring factory-set 2.31V reset threshold (±2.5% over -40°C to +125°C), 20ms minimum reset timeout, active-low push-pull reset output, and guaranteed operation down to VCC = 1V. It monitors single supply voltage in battery-powered controllers and portable instrumentation.

For engineers reviewing the MAX6381XR23D2+T datasheet, MAX6381XR23D2+T pinout, MAX6381XR23D2+T application, or MAX6381XR23D2+T equivalent, key selection criteria include reset threshold accuracy, ultra-low 3μA supply current at 1.8V, VCC transient immunity, and compatibility with critical μP power-up sequencing in space-constrained designs.

Technical Context

The MAX6381XR23D2+T implements a precision bandgap-based reset comparator with ±2.5% threshold tolerance across -40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a fixed 20ms minimum reset assertion period after VCC rises above 2.31V.

This variant belongs to the MAX6381 series with no manual reset (MR) input or auxiliary RESET IN pin - only VCC monitoring and active-low push-pull RESET output. It guarantees valid logic state for RESET down to VCC = 1V, enabling robust brownout detection in low-voltage systems.

Key Specifications

Pinout & Package

MAX6381XR23D2+T uses a 3-pin SC70 package (outline 21-0075, land pattern 90-0208) with 0.65mm pitch and 1.25mm × 0.85mm footprint - optimized for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD2+T and TPS3808G125DBVR, the MAX6381XR23D2+T delivers tighter threshold accuracy (±2.5% vs ±3.5%), lower quiescent current (3μA vs 12μA/1.5μA), and guaranteed operation to +125°C - making it optimal for space-constrained, battery-sensitive, and automotive-qualified designs requiring precise 20ms reset hold time.

Availability

MAX6381XR23D2+T is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, industrial PLC I/O submodules, and smart energy meters requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6381XR23D2+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 demanding industrial, automotive, and computing applications - emphasizing low power, high reliability, and small form factor.

The MAX6381–MAX6390 family targets ultra-low-power microprocessor supervision in battery-operated and thermally harsh environments, delivering factory-trimmed reset thresholds and guaranteed timing across extended temperature ranges.

FAQ

What is the exact reset threshold voltage of MAX6381XR23D2+T and how stable is it over temperature?

The MAX6381XR23D2+T has a nominal reset threshold of 2.31V, with ±2.5% tolerance over the full -40°C to +125°C operating range and a tempco of 60ppm/°C. This stability is confirmed in the Electrical Characteristics table and Typical Operating Characteristics graph (toc04), ensuring predictable brownout response in automotive and industrial deployments where MAX6381XR23D2+T is commonly deployed.

Does MAX6381XR23D2+T include a manual reset input (MR) or auxiliary RESET IN pin?

No, MAX6381XR23D2+T does not include MR or RESET IN functionality. As specified in the Selector Guide and Pin Configurations, only the MAX6384–MAX6390 series offer MR, and only MAX6387–MAX6389 provide RESET IN. The MAX6381XR23D2+T is a single-supply, no-MR variant with dedicated VCC monitoring and active-low push-pull RESET output - simplifying design for basic reset supervision tasks.

What package type and dimensions does MAX6381XR23D2+T use, and is it RoHS-compliant?

MAX6381XR23D2+T uses a 3-pin SC70 package (outline number 21-0075, land pattern 90-0208) measuring 1.25mm × 0.85mm with 0.65mm pin pitch. The "+T" suffix confirms lead(Pb)-free and RoHS-compliant construction, verified in the Ordering Information and Package Information sections of the datasheet - meeting global environmental compliance requirements without derating.

How does the 20ms reset timeout of MAX6381XR23D2+T compare to other variants in the family?

The "D2" suffix in MAX6381XR23D2+T specifies a 20ms minimum reset timeout, one of seven standardized delays (1ms, 20ms, 140ms, etc.) available across the MAX6381–MAX6390 family. Unlike MAX6390 which offers dual timeouts (e.g., 1120ms VCC + 140ms MR), MAX6381XR23D2+T provides a single, fixed 20ms hold time - ideal for fast-boot μPs where rapid recovery after brief brownouts is critical.

Can MAX6381XR23D2+T operate reliably at VCC = 1.0V, and what happens to the RESET output below that?

Yes, MAX6381XR23D2+T guarantees correct RESET output logic state down to VCC = 1.0V, as stated in the Absolute Maximum Ratings and Detailed Description sections. Below 1.0V, the device ceases to function predictably; however, the push-pull architecture ensures strong drive capability across its entire 1.0V–5.5V operating range - unlike open-drain variants that require external pullups and lose drive strength near VCC min.