Analog Devices Inc./Maxim Integrated MAX6381XR28D2-T

Overview

MAX6381XR28D2-T from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 2.80V reset threshold, 20ms minimum reset timeout, active-low open-drain reset output, and operation down to VCC = 1.0V. It monitors single supply voltage in battery-powered embedded systems, ensuring reliable μP reset during brownout or power-up sequencing in portable instrumentation and industrial controllers.

For engineers reviewing the MAX6381XR28D2-T datasheet, MAX6381XR28D2-T pinout, MAX6381XR28D2-T application, or MAX6381XR28D2-T equivalent, key selection criteria include its ±2.5% reset threshold accuracy over –40°C to +125°C, 3μA supply current at 1.8V, SC70-3 package footprint, and compatibility with dual-voltage monitoring systems requiring auxiliary reset inputs.

Technical Context

The MAX6381XR28D2-T implements a precision bandgap-based reset comparator with 60ppm/°C tempco and guarantees valid reset assertion down to VCC = 1.0V. Its internal timer enforces a fixed 20ms minimum reset timeout after VCC rises above 2.80V, independent of temperature or supply variation.

This variant belongs to the MAX6381–MAX6390 family's open-drain active-low subgroup (MAX6383/MAX6386/MAX6389/MAX6390), lacks manual reset (MR) and auxiliary RESET IN inputs, and uses a 3-pin SC70 package with pins assigned as VCC, GND, and RESET.

Key Specifications

Pinout & Package

MAX6381XR28D2-T is housed in a 3-pin SC70 package (outline 21-0075, land pattern 90-0208) with exposed pad not connected internally. Pin assignments are validated per Maxim's official pin description table and typical operating circuit.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6381XR28D2-T, MAX809TRD2-T offers higher reset voltage and longer timeout in identical packaging, while TPS3808G12DBVR trades fixed timing for configurability and adds an enable input-both require layout changes and do not match the 2.80V/20ms specification set.

Availability

MAX6381XR28D2-T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, critical μP and μC power monitoring, and intelligent instruments requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6381XR28D2-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 high-performance analog and mixed-signal ICs for industrial, automotive, and computing applications with emphasis on power efficiency and reliability.

The MAX6381–MAX6390 product line delivers single/dual low-voltage supervisory circuits optimized for battery-powered and thermally demanding embedded systems where precision reset timing and ultra-low ICC are critical.

FAQ

What is the exact reset threshold voltage of MAX6381XR28D2-T and how tightly is it specified?

The MAX6381XR28D2-T has a factory-set nominal reset threshold of 2.80V, with guaranteed tolerance of ±2.5% over the full operating temperature range of –40°C to +125°C. This corresponds to a min/max range of 2.73V to 2.87V at +25°C and 2.70V to 2.87V across temperature, as confirmed in the Electrical Characteristics table under VTH parameter.

Does MAX6381XR28D2-T support manual reset (MR) or auxiliary voltage monitoring (RESET IN)?

No, MAX6381XR28D2-T does not include manual reset (MR) or auxiliary RESET IN functionality. It belongs to the MAX6381/MAX6382/MAX6383 subgroup, which features only VCC monitoring and open-drain (MAX6383) or push-pull outputs. MR is present only on MAX6384–MAX6386 and MAX6390; RESET IN is exclusive to MAX6387–MAX6389.

What is the minimum supply voltage at which MAX6381XR28D2-T guarantees correct reset output logic state?

MAX6381XR28D2-T guarantees valid reset output logic state down to VCC = 1.0V, as explicitly stated in both the Absolute Maximum Ratings and Detailed Description sections. Below 1.0V, reset behavior is not characterized; above 1.0V, the open-drain RESET pin correctly pulls low when asserted and floats high when deasserted.

What package type and footprint does MAX6381XR28D2-T use, and is it RoHS-compliant?

MAX6381XR28D2-T uses the 3-pin SC70 package (outline number 21-0075, land pattern 90-0208), measuring 1.25mm × 0.85mm. The "+T" suffix confirms it is lead(Pb)-free and RoHS-compliant, per Maxim's ordering information footnote indicating "+ denotes a lead(Pb)-free/RoHS-compliant package."

How does the 20ms reset timeout of MAX6381XR28D2-T compare to other variants in the MAX6381–MAX6390 family?

The "D2" suffix in MAX6381XR28D2-T specifies a 20ms minimum reset timeout, one of seven standard delays (1ms, 20ms, 140ms, 280ms, 560ms, 1120ms, 1200ms). This value is fixed by internal capacitor sizing and is guaranteed over temperature; it is shorter than D3 (140ms) and longer than D1 (1ms), making it suitable for fast-boot μPs with minimal initialization overhead.