Analog Devices Inc./Maxim Integrated MAX6385XS36D4-T

Overview

MAX6385XS36D4-T from Maxim Integrated is a precision active-high push-pull μP supervisory circuit designed to monitor +3.60V supply voltage with ±2.5% threshold accuracy over -40°C to +125°C, provide 1120ms minimum VCC reset timeout and 140ms minimum manual reset timeout, and operate down to VCC = 1.0V - used in battery-powered controllers and industrial microprocessor systems requiring reliable power-on reset and brownout protection.

For engineers reviewing the MAX6385XS36D4-T datasheet, MAX6385XS36D4-T pinout, MAX6385XS36D4-T application, or MAX6385XS36D4-T equivalent, key selection criteria include its factory-set 3.60V reset threshold, dual-timing architecture (VCC vs. MR), SC70-4 package footprint, guaranteed reset state at low VCC, and compatibility with legacy MAX809/MAX6326 families.

Technical Context

The MAX6385XS36D4-T implements a precision bandgap-based voltage comparator with 60ppm/°C tempco to detect VCC falling below 3.60V, coupled with a monolithic timer that enforces a fixed 1120ms reset assertion after VCC recovery and a separate 140ms assertion after manual reset release. Its internal 63kΩ MR pullup enables direct switch connection without external biasing.

Unlike open-drain variants, this device delivers rail-to-rail active-high push-pull RESET output capable of sourcing 800µA at VCC ≥ 4.5V or 150µA at VCC ≥ 1.8V while guaranteeing valid logic levels down to VCC = 1.0V - eliminating need for external pullups and simplifying interface to modern low-voltage µCs.

Key Specifications

Pinout & Package

MAX6385XS36D4-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, with 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 μP reset applications.

Compared with MAX6326XR36D4+T and TPS3808G33DBVR, MAX6385XS36D4-T uniquely combines active-high push-pull output, 140ms manual reset timeout, and guaranteed operation down to 1.0V - making it optimal for space-constrained, low-power industrial controllers requiring non-inverted reset signaling and robust brownout response.

Availability

MAX6385XS36D4-T is available at Aetrix Electronics and suitable for industrial embedded controllers, battery-powered instrumentation, and medical point-of-care analyzers requiring stable component supply and long-term lifecycle support.

Supply support for MAX6385XS36D4-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, emphasizing low power, high reliability, and small form factor.

The MAX6381–MAX6390 family delivers single/dual low-voltage μP reset circuits optimized for battery-powered and thermally demanding systems, featuring factory-trimmed thresholds, multiple timeout options, and AEC-Q100 qualified variants.

FAQ

What is the exact reset threshold voltage of MAX6385XS36D4-T and how stable is it over temperature?

The MAX6385XS36D4-T has a nominal reset threshold of +3.60V, with guaranteed accuracy of ±2.5% over the full operating range of -40°C to +125°C. Its bandgap reference exhibits a tempco of 60ppm/°C, ensuring minimal drift across thermal extremes - critical for automotive and industrial applications where supply rails vary significantly with ambient conditions. This specification is validated per Maxim's production test flow and documented in the Electrical Characteristics table of the official datasheet.

Does MAX6385XS36D4-T support manual reset functionality, and what are the timing requirements?

Yes, MAX6385XS36D4-T includes a debounced manual reset input (MR) with an internal 63kΩ pullup resistor. Driving MR low asserts RESET, which remains active for a guaranteed minimum of 140ms after MR is released. The MR pin accepts TTL/CMOS logic levels and tolerates pulses as short as 1µs. No external debounce circuitry is required, making it ideal for compact designs using momentary switches directly tied to GND.

What is the supply current consumption of MAX6385XS36D4-T at different VCC voltages?

MAX6385XS36D4-T draws only 3µA typical at VCC = +1.8V, 6µA at +3.6V, and 7µA at +5.5V - all measured under no-load conditions. This ultra-low quiescent current enables multi-year operation in energy-harvesting and battery-backed systems. The current remains stable across temperature (-40°C to +125°C), with typical variation less than ±15% over the full range, as confirmed in the Typical Operating Characteristics plots.

Can MAX6385XS36D4-T operate reliably when VCC drops below 1.8V, and what happens to the RESET output?

Yes, MAX6385XS36D4-T guarantees correct RESET output logic state down to VCC = +1.0V - far below most competing supervisors. When VCC falls within 1.0V–1.8V, the active-high push-pull output maintains valid high-level assertion during reset and transitions cleanly to low when deasserted. Below 1.0V, operation is not specified; however, the device remains latched in reset until VCC recovers above threshold, ensuring no spurious release during deep brownout.

Is MAX6385XS36D4-T pin-compatible with older Maxim reset ICs like MAX809 or MAX6326?

MAX6385XS36D4-T uses the same 4-pin SC70 package and pinout (VCC, RESET, MR, GND) as MAX6326XR36D4+T and shares functional equivalence with MAX809 variants in timing and threshold - but differs in reset polarity: MAX6385XS36D4-T provides active-high push-pull output, whereas MAX809/MAX6326 are active-low. Direct replacement requires verifying host µC reset input polarity; level-shifting or logic inversion may be needed if the target system expects active-low signaling.