Analog Devices Inc./Maxim Integrated MAX6384XS42D2-T

Overview

MAX6384XS42D2-T from Maxim Integrated is a low-power microprocessor supervisory circuit with factory-set 4.20V reset threshold, 20ms minimum V_CC 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 V_CC = 1V. Used in portable battery-powered equipment requiring reliable power-on reset and brownout protection.

For engineers reviewing the MAX6384XS42D2-T datasheet, MAX6384XS42D2-T pinout, MAX6384XS42D2-T application, or MAX6384XS42D2-T equivalent, key selection criteria include its 4.20V ±2.5% threshold accuracy over –40°C to +125°C, debounced manual reset input with internal 63kΩ pullup, 4-pin SC70 package, and compatibility with dual-voltage monitoring systems via external resistor-divider configurations.

Technical Context

The MAX6384XS42D2-T implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy across temperature, paired with a monolithic RC timer for deterministic 20ms reset assertion after V_CC recovery. Its reset logic asserts on V_CC falling below 4.20V and holds active for ≥20ms after V_CC rises above threshold.

It integrates a debounced manual reset (MR) input with 1μs minimum pulse width support and 100ns glitch rejection, driven by an internal 63kΩ pullup resistor. MR-to-reset delay is 200ns, and the device maintains guaranteed reset output validity even as V_CC drops to 1V - critical for controlled shutdown in low-voltage embedded systems.

Key Specifications

Pinout & Package

MAX6384XS42D2-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098), footprint-compatible with industry-standard land pattern 90-0187. Thermal resistance θ_JA = 322.6°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 MAX6384XS42D2-T, MAX6326XR42D2+T requires layout changes for pullup routing and alters reset drive strength, while TPS3808G33DBVR cannot monitor 4.2V rails and omits MR functionality - making MAX6384XS42D2-T the sole option supporting 4.20V threshold, MR input, and push-pull drive in 4-pin SC70.

Availability

MAX6384XS42D2-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and smart home hub power management requiring stable component supply and long-term lifecycle assurance.

Supply support for MAX6384XS42D2-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 power, sensing, and connectivity applications, with emphasis on high-reliability industrial and automotive markets.

The MAX6381–MAX6390 family delivers ultra-low-power, factory-trimmed supervisory circuits optimized for battery-operated and thermally demanding embedded systems requiring guaranteed reset behavior across wide voltage and temperature ranges.

FAQ

What is the exact reset threshold voltage of MAX6384XS42D2-T and how stable is it over temperature?

The MAX6384XS42D2-T has a nominal reset threshold of 4.20V, with guaranteed tolerance of ±2.5% over the full operating temperature range of –40°C to +125°C. This stability is achieved through laser-trimmed bandgap references and matched transistor pairs in Maxim's BiCMOS process, ensuring consistent brownout detection without external calibration. The MAX6384XS42D2-T maintains this accuracy even under rapid thermal cycling conditions common in automotive under-hood applications.

Does MAX6384XS42D2-T support manual reset, and what are the electrical requirements for the MR pin?

Yes, MAX6384XS42D2-T includes a debounced manual reset (MR) input with an internal 63kΩ pullup resistor to V_CC. To assert reset, MR must be driven below 0.3 × V_CC (for V_TH < 4V) for ≥1μs. The input rejects glitches shorter than 100ns and exhibits 200ns propagation delay from MR low to RESET# assertion. The MAX6384XS42D2-T allows direct connection to a normally-open momentary switch between MR and GND - no external components required.

What package type and pin count does MAX6384XS42D2-T use, and is it RoHS-compliant?

MAX6384XS42D2-T uses a 4-pin SC70 package (outline 21-0098), with land pattern 90-0187, and carries the "+T" suffix indicating lead(Pb)-free/RoHS-compliant construction. Its compact 1.3mm × 1.6mm footprint and 0.65mm pitch make it suitable for space-constrained portable designs. The package supports reflow soldering per JEDEC J-STD-020 (peak 260°C) and has θ_JA = 322.6°C/W on multilayer boards - verified per JESD51-7.

How does MAX6384XS42D2-T behave during severe supply transients, and what protection does it offer?

MAX6384XS42D2-T provides robust immunity to negative-going V_CC transients: it will not assert reset for pulses up to 350μs wide when the overdrive (V_TH – V_CC) is 100mV. This is enabled by internal hysteresis and comparator slew-rate limiting. For enhanced immunity, Maxim recommends placing a 0.1μF ceramic capacitor as close as possible to the V_CC pin. The MAX6384XS42D2-T also guarantees valid reset output down to V_CC = 1V - preventing metastability during uncontrolled power collapse.

Can MAX6384XS42D2-T monitor a second voltage rail, and if not, what are the alternatives in the same family?

No, MAX6384XS42D2-T does not support auxiliary voltage monitoring - it monitors only V_CC. For dual-rail supervision, select MAX6387XS42D2-T (4-pin SC70) or MAX6387LT42D2-T (6-pin μDFN), which feature a dedicated RESET IN pin comparing against an internal 1.27V reference. These allow user-defined thresholds via external resistor dividers and assert reset if either V_CC or RESET IN falls below its respective threshold - all while retaining the same 4.20V V_CC threshold and 20ms timeout of the MAX6384XS42D2-T.