Analog Devices Inc./Maxim Integrated MAX6383LT29D3+

Overview

MAX6383LT29D3+ from Maxim Integrated is a low-power, open-drain active-low microprocessor supervisory circuit designed to monitor +2.93V supply rails in embedded systems. It features ±2.5% reset threshold accuracy over -40°C to +125°C, 140ms minimum reset timeout, 3µA supply current at +1.8V, and guaranteed valid reset output down to VCC = 1V. It is used in portable battery-powered equipment requiring reliable power-on reset and brownout protection.

For engineers reviewing the MAX6383LT29D3+ datasheet, MAX6383LT29D3+ pinout, MAX6383LT29D3+ application, or MAX6383LT29D3+ equivalent, key selection criteria include its 2.93V factory-set reset threshold, 140ms timeout, open-drain output requiring external pull-up, SC70-3/µDFN-6 package options, and compatibility with low-voltage µP reset inputs in space-constrained designs.

Technical Context

The MAX6383LT29D3+ implements a precision bandgap-based voltage comparator with internal hysteresis to detect VCC falling below 2.93V (±2.5% over temperature), triggering an open-drain RESET assertion. Its internal timer ensures the reset signal remains active for ≥140ms after VCC recovers above threshold.

As part of the MAX6381–MAX6390 family, it shares BiCMOS process technology (647 transistors), negative-going VCC transient immunity up to ~35µs at 100mV overdrive, and operates across 1.0V–5.5V supply range - enabling use in ultra-low-power systems where reset validity must be maintained down to VCC = 1V.

Key Specifications

Pinout & Package

MAX6383LT29D3+ is available in 3-pin SC70 (X3-2) and 6-pin µDFN (L611-1) packages. Both variants feature identical pin functions: Pin 1 = RESET (open-drain active-low), Pin 2 = VCC, Pin 3 = GND (SC70); Pins 1–6 follow standard µDFN layout with RESET, VCC, GND, and two N.C. terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3+T, MAX6383LT29D3+ offers extended temperature support and tighter thermal drift control; compared with TPS3808G33DBVR, it provides guaranteed reset validity at ultralow VCC but requires external pull-up and has higher quiescent current.

Availability

MAX6383LT29D3+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and automotive body control units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6383LT29D3+ 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 power, sensing, and interface applications in industrial, automotive, and communications markets.

The MAX6381–MAX6390 family was engineered specifically for low-voltage, low-power microprocessor reset supervision - emphasizing nanoscale BiCMOS efficiency, factory-trimmed thresholds, and robust transient immunity in space-constrained embedded systems.

FAQ

What is the factory-set reset threshold voltage for MAX6383LT29D3+?

The MAX6383LT29D3+ has a factory-set reset threshold of 2.93V, with ±2.5% accuracy over the full operating temperature range of -40°C to +125°C. This value is laser-trimmed during production and does not require external components. The '29' suffix in the part number directly corresponds to the 2.93V threshold per Maxim's ordering guide.

Does MAX6383LT29D3+ include a manual reset input (MR)?

No, MAX6383LT29D3+ does not include a manual reset input. It belongs to the MAX6381/MAX6382/MAX6383 subgroup, which lacks MR functionality. Only MAX6384–MAX6386 and MAX6390 variants integrate a debounced MR pin. For manual reset capability, consider MAX6384LT29D3+ or MAX6390LT29D3+ instead.

What package options are available for MAX6383LT29D3+?

MAX6383LT29D3+ is offered in two RoHS-compliant, lead-free packages: 3-pin SC70 (package code X3-2) and 6-pin µDFN (package code L611-1). Both packages support the full -40°C to +125°C temperature range and share identical electrical specifications. The SC70 variant is optimal for minimal footprint; the µDFN offers enhanced thermal performance in high-density layouts.

What is the minimum reset timeout period for MAX6383LT29D3+?

The minimum reset timeout period for MAX6383LT29D3+ is 140ms, denoted by the 'D3' suffix in the part number. This is guaranteed over temperature and supply voltage. The internal timer begins counting when VCC rises above 2.93V and holds RESET low for ≥140ms before releasing, ensuring sufficient time for µP clock stabilization and memory initialization.

Can MAX6383LT29D3+ operate with supply voltages below 2.93V?

Yes, MAX6383LT29D3+ operates from 1.0V to 5.5V and guarantees correct RESET logic state down to VCC = 1.0V. While the reset function triggers when VCC falls below 2.93V, the device continues to assert RESET reliably even as VCC decays further - critical for orderly shutdown in battery-powered systems. This behavior is validated per Electrical Characteristics table (VCC ≥ 1.0V, ISINK = 80µA).