Analog Devices Inc./Maxim Integrated MAX6384LT26D3+T

Overview

MAX6384LT26D3+T from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 2.63V reset threshold, 140ms minimum VCC reset timeout, and active-low push-pull reset output. It monitors +1.8V to +5.0V supply rails, consumes only 3μA at +1.8V, and guarantees valid reset state down to VCC = 1V. Used in portable battery-powered equipment for reliable power-up sequencing and brownout protection.

For engineers reviewing the MAX6384LT26D3+T datasheet, MAX6384LT26D3+T pinout, MAX6384LT26D3+T application, or MAX6384LT26D3+T equivalent, key selection criteria include reset threshold accuracy (±2.5% over –40°C to +125°C), manual reset input with internal 63kΩ pullup, SC70-4 package compatibility, and immunity to negative-going VCC transients.

Technical Context

The MAX6384LT26D3+T implements a precision bandgap-based voltage comparator for VCC monitoring and an internal monostable timer for fixed 140ms reset assertion after VCC recovery. Its reset logic asserts on VCC falling below 2.63V and holds reset active for ≥140ms after VCC rises above threshold.

It features a debounced active-low manual reset input (MR) with 1μs minimum pulse width support and 100ns glitch rejection. The MR pin includes an internal 63kΩ pullup resistor and operates with TTL/CMOS-compatible logic levels, enabling direct connection to momentary switches without external debounce circuitry.

Key Specifications

Pinout & Package

MAX6384LT26D3+T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm, suitable for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6384LT26D3+T, MAX6326XR26D3+T removes MR functionality while maintaining identical reset timing and threshold, whereas TPS3808G33DBVR shifts threshold upward by 300mV and extends timeout-both require schematic and layout review for functional equivalence.

Availability

MAX6384LT26D3+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 MAX6384LT26D3+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, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.

The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy reset supervision for battery-operated and harsh-environment microprocessor systems, emphasizing threshold stability, transient immunity, and minimal board area.

FAQ

What is the exact reset threshold voltage of MAX6384LT26D3+T and how tightly is it specified?

The MAX6384LT26D3+T has a factory-set reset threshold of 2.63V, guaranteed over –40°C to +125°C with ±2.5% tolerance (i.e., 2.56V to 2.69V). This specification is confirmed in the Electrical Characteristics table of the official datasheet and reflects worst-case variation across temperature and process corners-not typical or room-temperature-only values. The MAX6384LT26D3+T uses laser-trimmed internal resistors to achieve this accuracy without external components.

Does MAX6384LT26D3+T support manual reset, and what are the electrical requirements for the MR pin?

Yes, MAX6384LT26D3+T includes a dedicated MR (manual reset) input with an internal 63kΩ pullup resistor to VCC. To assert reset, drive MR below 0.3×VCC (for VTH < 4V) for ≥1μs; the device guarantees 100ns glitch rejection. MR accepts TTL/CMOS logic levels and can interface directly with a normally open momentary switch tied to GND-no external pullup or debounce circuitry is required. This MR functionality is confirmed in the Pin Description and Features sections of the MAX6384LT26D3+T datasheet.

What package type and dimensions does MAX6384LT26D3+T use, and is it RoHS-compliant?

MAX6384LT26D3+T is supplied in a 4-pin SC70 package (outline number 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm. The "+T" suffix explicitly denotes lead(Pb)-free and RoHS-compliant construction. Thermal resistance is θJA = 322.6°C/W on a multilayer board. This package is verified in the Ordering Information and Package Information sections of the MAX6384LT26D3+T datasheet.

Can MAX6384LT26D3+T operate reliably during severe supply voltage droops, and down to what VCC level does reset remain valid?

Yes, MAX6384LT26D3+T guarantees correct RESET output logic state down to VCC = 1.0V, as stated in both Absolute Maximum Ratings and Electrical Characteristics. Its internal regulator and comparator architecture maintains functionality during deep brownouts. Below 1.0V, reset behavior is not specified. This 1.0V minimum operating voltage is a key differentiator versus many competing supervisors and is fully documented in the MAX6384LT26D3+T datasheet's Operating Voltage Range specification.

How does the 140ms reset timeout of MAX6384LT26D3+T compare to other timing options in the MAX6381–MAX6390 family?

The "D3" suffix in MAX6384LT26D3+T specifies a 140ms minimum VCC reset timeout period, one of seven discrete delays available (1ms, 20ms, 140ms, 280ms, 560ms, 1120ms, 1200ms). This value is guaranteed over temperature and process variation, with typical performance ranging 140–280ms. Unlike MAX6390 variants, MAX6384LT26D3+T applies the same 140ms timeout to both VCC recovery and MR release-no separate manual reset timeout is implemented. This is confirmed in the Reset Timeout Period table and Selector Guide.