Analog Devices Inc./Maxim Integrated MAX6385XS19D1-T

Overview

MAX6385XS19D1-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 1.9V 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 from +1.8V to +5.0V and guarantees valid reset state down to VCC = 1V - used in battery-powered controllers and portable instrumentation for reliable power-up/brownout protection.

For engineers reviewing the MAX6385XS19D1-T datasheet, MAX6385XS19D1-T pinout, MAX6385XS19D1-T application, or MAX6385XS19D1-T equivalent, key selection criteria include its 1.9V threshold accuracy, 1ms timeout timing, MR debounce capability, and compatibility with 4-pin SC70 layout constraints in space-constrained embedded systems.

Technical Context

The MAX6385XS19D1-T implements a precision bandgap-based voltage comparator monitoring VCC against a fixed 1.9V threshold, with ±2.5% tolerance across −40°C to +125°C. Its internal timer initiates a guaranteed-minimum 1ms reset assertion after VCC falls below threshold or MR is pulled low.

It features an active-high push-pull RESET output capable of sourcing 800µA at VCC ≥ 4.5V (VOH ≥ 0.8×VCC) and sinking 3.2mA (VOL ≤ 0.4V), plus a debounced MR input with 1µs minimum pulse width and 100ns glitch rejection - enabling direct interface with mechanical switches or logic without external RC networks.

Key Specifications

Pinout & Package

MAX6385XS19D1-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 - optimized for high-density PCB layouts in portable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6385XS19D1-T, the MAX6385XS19D2-T extends reset duration for slower-booting systems, while TPS3808G19DBVR trades MR functionality for lower quiescent current and different packaging - neither is pin-compatible, requiring layout revision and timing validation.

Availability

MAX6385XS19D1-T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, industrial PLC I/O modules, and automotive body control units requiring stable component supply and long-term production continuity.

Supply support for MAX6385XS19D1-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 demanding industrial, automotive, and computing applications.

The MAX6381–MAX6390 family delivers low-power, high-accuracy μP reset supervision with configurable thresholds and timeouts - engineered specifically for reliability-critical embedded systems where supply integrity directly impacts functional safety.

FAQ

What is the exact reset threshold voltage of MAX6385XS19D1-T and how stable is it over temperature?

The MAX6385XS19D1-T has a factory-set nominal reset threshold of 1.90V, with guaranteed tolerance of ±2.5% over the full operating range of −40°C to +125°C. This corresponds to a minimum threshold of 1.85V and maximum of 1.95V at temperature extremes, ensuring robust brownout detection without calibration. The device achieves this stability via laser-trimmed bandgap references and low-tempco design - confirmed in the Electrical Characteristics table on page 3 of the datasheet.

Does MAX6385XS19D1-T support manual reset, and what are the electrical requirements for the MR pin?

Yes, MAX6385XS19D1-T includes a debounced manual reset input (MR) with an internal 63kΩ pullup resistor to VCC. To assert reset, MR must be driven below 0.3×VCC (e.g., <0.57V at VCC = 1.9V). The input accepts TTL/CMOS logic levels and tolerates pulses as short as 1µs. No external components are needed - a normally open switch from MR to GND suffices. Glitch rejection is rated at 100ns, making it suitable for noisy environments.

What is the function and drive capability of the RESET output on MAX6385XS19D1-T?

The RESET output of MAX6385XS19D1-T is an active-high push-pull driver. When asserted (reset active), it drives low; when deasserted, it drives high. It sources up to 800µA at VCC ≥ 4.5V (VOH ≥ 0.8×VCC) and sinks up to 3.2mA (VOL ≤ 0.4V), eliminating the need for external pullup resistors. This direct-drive capability simplifies interface to standard CMOS microcontroller reset inputs and ensures clean signal edges without rise-time degradation.

Can MAX6385XS19D1-T operate reliably at very low supply voltages, and what is its minimum functional VCC?

Yes, MAX6385XS19D1-T guarantees correct RESET output logic state down to VCC = 1.0V - critical for battery-depleted or brownout conditions. Its internal circuitry remains fully functional across the full specified operating range of +1.0V to +5.5V. At VCC = 1.0V, the RESET output still meets VOH ≥ 0.8×VCC and VOL ≤ 0.3V specifications, ensuring interoperability with 1.2V/1.8V logic families even during deep undervoltage events.

What package type and footprint does MAX6385XS19D1-T use, and are thermal characteristics documented?

MAX6385XS19D1-T uses a 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm. Thermal resistance is documented as θJA = 322.6°C/W and θJC = 115°C/W on a multilayer board (JEDEC JESD51-7 method). This compact RoHS-compliant package supports high-density layouts and is compatible with standard reflow profiles, including peak soldering temperature up to +260°C.