Analog Devices Inc./Maxim Integrated MAX6385XS35D1-T

Overview

MAX6385XS35D1-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 3.50V reset threshold (±2.5% over -40°C to +125°C), 1ms minimum reset timeout, and manual reset input (MR) with internal 63kΩ pullup. It monitors VCC in systems requiring reliable power-on reset for critical μP/μC operation under brownout or low-voltage conditions.

For engineers reviewing the MAX6385XS35D1-T datasheet, MAX6385XS35D1-T pinout, MAX6385XS35D1-T application, or MAX6385XS35D1-T equivalent, key selection criteria include reset threshold accuracy at temperature extremes, guaranteed reset assertion down to VCC = 1V, MR debounce capability without external components, and compatibility with SC70-4 footprint for space-constrained embedded designs.

Technical Context

The MAX6385XS35D1-T implements a precision bandgap-based voltage comparator for VCC monitoring, paired with a digital timeout counter that guarantees minimum 1ms reset assertion after VCC rises above 3.50V. Its MR input features built-in glitch rejection (100ns) and 1µs minimum pulse width requirement, enabling robust manual reset initiation.

Reset logic is fully static: the active-high push-pull output transitions high during fault (VCC < 3.50V or MR low) and remains asserted for ≥1ms after recovery, with output state valid down to VCC = 1V. No auxiliary voltage monitor (RESET IN) or dual-supply capability is present-this is a single-VCC supervisory device.

Key Specifications

Pinout & Package

MAX6385XS35D1-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098), measuring 2.0mm × 2.1mm × 0.95mm, suitable for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD1-T, MAX6385XS35D1-T adds MR functionality in a 4-pin SC70, enabling user-triggered reset without layout changes; versus TPS3808G33DBVR, it delivers exact 3.5V threshold alignment and shorter 1ms timeout for tighter μP boot timing control.

Availability

MAX6385XS35D1-T is available at Aetrix Electronics and suitable for industrial PLC controllers, medical patient monitors, automotive body control modules, and IoT edge sensor nodes requiring stable component supply with long-term lifecycle support.

Supply support for MAX6385XS35D1-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 supervisory circuits optimized for microprocessor reset in space- and power-constrained systems, with emphasis on AEC-Q100 qualification and wide temperature operation.

FAQ

What is the exact reset threshold voltage of the MAX6385XS35D1-T and how stable is it over temperature?

The MAX6385XS35D1-T has a factory-set reset threshold of 3.50V, specified with ±2.5% tolerance over the full operating temperature range of -40°C to +125°C. This stability is achieved using a precision bandgap reference and laser-trimmed resistors, ensuring consistent trip points in automotive and industrial environments without external calibration. The MAX6385XS35D1-T maintains this accuracy across voltage rails from 1.0V to 5.5V.

Does the MAX6385XS35D1-T require an external pullup resistor on its RESET output?

No, the MAX6385XS35D1-T features an active-high push-pull RESET output, which actively drives both high and low states. Unlike open-drain variants, it does not require an external pullup resistor - the output can directly interface with standard microprocessor RESET inputs. This simplifies schematic design and reduces component count compared to open-drain alternatives like the MAX6383 series.

Can the MAX6385XS35D1-T be used in automotive applications?

Yes - the MAX6385XS35D1-T is offered in an AEC-Q100 qualified version (denoted by /V suffix in ordering codes). While the specific part number MAX6385XS35D1-T shown here carries the RoHS-compliant "+T" suffix, automotive-grade variants (e.g., MAX6385XS35D1/V+T) are available and certified for operation in harsh automotive environments including extended temperature cycling and vibration exposure.

What is the function of the MR pin on the MAX6385XS35D1-T and how should it be used?

The MR (Manual Reset) pin on the MAX6385XS35D1-T is an active-low input that forces a reset when pulled below 0.3×VCC. It includes a 63kΩ internal pullup resistor, so it may be left unconnected if unused. To implement manual reset, connect a normally-open momentary switch between MR and GND. The MAX6385XS35D1-T requires only a 1µs minimum low pulse width and rejects glitches <100ns, eliminating need for external debounce circuitry.

How does the MAX6385XS35D1-T behave when VCC drops below 1.0V?

The MAX6385XS35D1-T guarantees correct reset output behavior down to VCC = 1.0V - meaning the RESET pin will remain in the asserted (high) state as long as VCC stays below 3.50V, even during deep brownout. Below 1.0V, operation is not specified; however, the device enters a known low-current state and releases reset only after VCC rises above 3.50V and sustains the 1ms timeout. This ensures deterministic behavior through worst-case power collapse scenarios.