Analog Devices Inc./Maxim Integrated MAX6381XR29D1+T

Overview

MAX6381XR29D1+T from Maxim Integrated is a low-power microprocessor supervisory circuit in 3-pin SC70 package, featuring factory-set 2.93V reset threshold (±2.5% over -40°C to +125°C), 1ms minimum reset timeout, and active-low push-pull reset output. It monitors VCC from +1.8V to +5.0V while consuming only 3μA at +1.8V, and guarantees valid reset state down to VCC = 1V - ideal for battery-powered microcontroller power-up sequencing in portable instrumentation.

For engineers reviewing the MAX6381XR29D1+T datasheet, MAX6381XR29D1+T pinout, MAX6381XR29D1+T application, or MAX6381XR29D1+T equivalent, key selection considerations include its fixed 2.93V threshold accuracy, 1ms timeout timing, SC70 footprint compatibility with legacy MAX809/MAX810, and guaranteed operation at VCC ≥ 1V without external biasing.

Technical Context

The MAX6381XR29D1+T implements a precision voltage comparator with internal 2.93V reference and hysteresis-free threshold detection, coupled to a monolithic timer that enforces a minimum 1ms reset assertion after VCC recovers above threshold. Its push-pull output drives directly into μP reset inputs without pullup resistors, and internal logic ensures reset remains asserted during VCC transients as short as 35μs below threshold.

No manual reset (MR) or auxiliary RESET IN pins are present - this variant belongs to the base MAX6381 series (3-pin SC70, no MR, no dual-monitoring), distinguishing it from MAX6384–MAX6390 and MAX6387–MAX6389 families. The device operates across -40°C to +125°C and is RoHS-compliant (+T suffix).

Key Specifications

Pinout & Package

3-pin SC70 package (outline 21-0075, land pattern 90-0208), footprint-compatible with industry-standard low-pin-count supervisory ICs. Thermal resistance θ_JA = 340.4°C/W on multilayer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD1+T and TPS3808G18DBVR, the MAX6381XR29D1+T uniquely delivers 1ms timeout at 3μA in a 3-pin SC70 - balancing speed, power, and footprint without enabling extra pins or sacrificing thermal performance.

Availability

MAX6381XR29D1+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6381XR29D1+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 industrial, automotive, and computing applications, with emphasis on low-power, high-reliability solutions.

The MAX6381–MAX6390 family was engineered specifically for space-constrained, battery-sensitive microprocessor supervision - delivering factory-trimmed thresholds, sub-μA quiescent current, and guaranteed operation down to 1V VCC in miniature SC70 and μDFN packages.

FAQ

What is the exact reset threshold voltage of MAX6381XR29D1+T and how tightly is it specified?

The MAX6381XR29D1+T has a nominal reset threshold of 2.93V, with guaranteed tolerance of ±2.5% over the full operating temperature range (-40°C to +125°C). This specification is confirmed in the Electrical Characteristics table of the official datasheet (Rev 7, 8/20), where VTH min = 2.85V and max = 3.00V at +25°C, and ±2.5% applies across temperature. The "29" suffix in the part number explicitly denotes this 2.93V threshold.

Does MAX6381XR29D1+T include a manual reset input (MR) or auxiliary RESET IN pin?

No, MAX6381XR29D1+T does not include MR or RESET IN functionality. It belongs to the base MAX6381 series, which uses a 3-pin SC70 configuration (RESET, VCC, GND) with no additional control or monitoring inputs. The datasheet Selector Guide and Pin Configurations confirm MR is only present on MAX6384–MAX6386 and MAX6390, while RESET IN appears only on MAX6387–MAX6389 - neither feature is implemented in MAX6381XR29D1+T.

What is the minimum reset timeout period for MAX6381XR29D1+T and how is it enforced?

The MAX6381XR29D1+T has a minimum reset timeout period of 1ms (suffix "D1"), guaranteed after VCC rises above the 2.93V threshold. This is implemented via an internal monolithic timer and is specified as t_RP = 1ms (min) in the Electrical Characteristics table. The actual timeout may extend up to 2ms depending on process variation and temperature, but will never fall below 1ms - ensuring reliable μP initialization across all conditions.

Can MAX6381XR29D1+T operate reliably when VCC drops below 1.8V?

Yes, MAX6381XR29D1+T guarantees correct reset output logic state down to VCC = 1.0V, as stated in both the General Description and Absolute Maximum Ratings sections. Its push-pull output remains functional and valid (low when asserted, high when deasserted) even at 1V supply, unlike many competitors that require ≥1.8V for output integrity. This enables robust operation during deep brownout events in battery-depleted systems.

Is MAX6381XR29D1+T pin-compatible with MAX809 or MAX810 series devices?

Yes, MAX6381XR29D1+T is pin-compatible with MAX809/MAX810 in the 3-pin SC70 package, as explicitly noted in the Features section ("Pin Compatible with MAX809/MAX810/..."). Both share identical pin 1 (RESET), pin 2 (VCC), and pin 3 (GND) assignments and mechanical outline (21-0075), allowing direct PCB replacement without layout modification - provided the 1ms timeout and 3μA current meet system requirements.