Analog Devices Inc./Maxim Integrated MAX6383XR29D3-T

Overview

MAX6383XR29D3-T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 2.93V reset threshold (±2.5% over -40°C to +125°C), 140ms minimum reset timeout, and 3μA supply current at +1.8V. It monitors single V_CC supply in battery-powered or space-constrained embedded systems requiring reliable power-on reset and brownout protection.

For engineers reviewing the MAX6383XR29D3-T datasheet, MAX6383XR29D3-T pinout, MAX6383XR29D3-T application, or MAX6383XR29D3-T equivalent, key selection factors include its open-drain reset architecture requiring external pullup, guaranteed valid reset state down to V_CC = 1V, negative-going transient immunity, and compatibility with 3-pin SC70 footprint for ultra-compact PCB layouts.

Technical Context

This device implements a precision voltage comparator with internal 2.93V reference and an independent monostable timer that triggers on V_CC falling below threshold or manual reset assertion. The open-drain RESET output supports wired-OR configurations and level-shifting across mixed-voltage domains.

It operates across full industrial temperature range (-40°C to +125°C) with ±2.5% reset threshold accuracy and 60ppm/°C tempco, while consuming only 3μA at 1.8V - enabling use in always-on, energy-sensitive applications without compromising reset reliability.

Key Specifications

Pinout & Package

MAX6383XR29D3-T is housed in a RoHS-compliant 3-pin SC70 package (outline 21-0075, land pattern 90-0208), featuring exposed pad for thermal performance and compact 1.25mm × 0.85mm footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3-T and TPS3808G33DBVR, MAX6383XR29D3-T uniquely combines ultra-low 3μA supply current, guaranteed reset validity down to 1V, and open-drain output in the smallest SC70 footprint - making it optimal for battery-critical, mixed-voltage, or space-constrained designs where reset bus sharing is required.

Availability

MAX6383XR29D3-T is available at Aetrix Electronics and suitable for battery-powered wearables, automotive body control modules, industrial sensor nodes, and medical diagnostic handhelds requiring stable component supply throughout product lifecycles.

Supply support for MAX6383XR29D3-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.

The MAX6381–MAX6390 family delivers low-power, high-accuracy μP supervisory circuits optimized for space- and energy-constrained embedded systems requiring robust power-monitoring and reset generation.

FAQ

What is the exact reset threshold voltage of MAX6383XR29D3-T and how stable is it over temperature?

The MAX6383XR29D3-T has a factory-set nominal reset threshold of 2.93V, with guaranteed accuracy of ±2.5% over the full industrial temperature range (-40°C to +125°C). Its temperature coefficient is 60ppm/°C, meaning the threshold drifts less than ±0.3% across the entire operating range - critical for reliable brownout detection in automotive and industrial environments where ambient temperature varies widely.

Does MAX6383XR29D3-T require an external pullup resistor on the RESET pin?

Yes, MAX6383XR29D3-T features an open-drain active-low RESET output and requires an external pullup resistor to the target logic rail (e.g., 3.3V or 5V). Typical values range from 10kΩ to 100kΩ depending on bus capacitance and rise-time requirements. This architecture enables wired-OR reset busing and level translation between different voltage domains - a key advantage over push-pull alternatives like MAX809TRD3-T.

What is the minimum supply voltage at which MAX6383XR29D3-T guarantees correct reset output behavior?

MAX6383XR29D3-T guarantees valid reset output state down to V_CC = 1.0V. Below this voltage, the internal comparator and timer may not function reliably. This specification ensures deterministic reset assertion during deep brownout conditions - unlike many competing supervisors that cease operation above 1.5V - making MAX6383XR29D3-T especially suitable for ultra-low-voltage battery applications where supply can sag significantly before shutdown.

Can MAX6383XR29D3-T be used in automotive applications?

MAX6383XR29D3-T itself is not AEC-Q100 qualified; however, the MAX6383XR29D3/V+T variant is automotive-grade and qualified per AEC-Q100. The standard MAX6383XR29D3-T operates across -40°C to +125°C and meets all electrical specifications for under-hood environments, but lacks the extended reliability testing and traceability required for safety-critical automotive functions. For non-safety systems (e.g., infotainment accessories), MAX6383XR29D3-T may be deployed with customer validation.

How does the 140ms reset timeout of MAX6383XR29D3-T compare to other timing options in the MAX638x family?

The "D3" suffix in MAX6383XR29D3-T specifies a 140ms minimum reset timeout - one of seven discrete delays available (1ms, 20ms, 140ms, 280ms, 560ms, 1120ms, 1200ms). This value balances sufficient time for modern low-power MCUs to initialize flash and peripherals without excessive system startup delay. It is identical to the timeout offered by MAX6383XR29D3/V+T and differs from D2 (20ms) and D5 (280ms) variants, allowing precise matching to specific processor boot requirements.