Analog Devices Inc./Maxim Integrated MAX6385XS17D3-T

Overview

MAX6385XS17D3-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 1.67V reset threshold (±2.5% over –40°C to +125°C), 140ms minimum VCC reset timeout, and debounced manual reset input. It monitors single-supply rails from +1.8V to +5.0V and consumes only 3μA at +1.8V, enabling reliable power-on reset in battery-powered embedded controllers.

For engineers reviewing the MAX6385XS17D3-T datasheet, MAX6385XS17D3-T pinout, MAX6385XS17D3-T application, or MAX6385XS17D3-T equivalent, key selection criteria include its 1.67V threshold accuracy, guaranteed reset validity down to VCC = 1V, 4-pin SC70 package footprint, and compatibility with systems requiring manual reset assertion without external debounce circuitry.

Technical Context

The device implements a precision bandgap-based voltage comparator for VCC monitoring and an internal monostable timer that guarantees minimum 140ms reset assertion after VCC rises above 1.67V. Its MR input features a 63kΩ internal pullup resistor and accepts TTL/CMOS logic levels, with glitch rejection of 100ns and MR-to-RESET delay under 200ns.

Reset output state remains valid across full VCC range (1.0V–5.5V); push-pull architecture delivers VOH ≥ 0.8×VCC (at ISOURCE = 150µA, VCC ≥ 1.8V) and VOL ≤ 0.3V (at ISINK = 80µA, VCC ≥ 1.0V), ensuring robust interface with modern µP reset inputs.

Key Specifications

Pinout & Package

MAX6385XS17D3-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 1.3mm × 1.6mm × 0.95mm, optimized 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 MAX6385XS17D2-T, the MAX6385XS17D3-T provides longer reset assertion for slower peripherals; versus MAX6385LT17D3-T, it offers 30% smaller board area at the cost of higher junction-to-ambient thermal resistance.

Availability

MAX6385XS17D3-T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, and smart energy meters requiring stable component supply and long-term lifecycle support.

Supply support for MAX6385XS17D3-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, with emphasis on low-power, high-reliability solutions.

The MAX6381–MAX6390 family delivers single/dual low-voltage supervisory circuits targeting space- and power-constrained embedded systems needing guaranteed reset timing and factory-trimmed thresholds.

FAQ

What is the exact reset threshold voltage of the MAX6385XS17D3-T and how stable is it over temperature?

The MAX6385XS17D3-T has a factory-set reset threshold of 1.67V with ±2.5% accuracy over the full –40°C to +125°C operating range. Its 60ppm/°C temperature coefficient ensures minimal drift, making it suitable for automotive and industrial applications where supply rails vary significantly with ambient conditions. This specification is guaranteed-not typical-and applies to all units of MAX6385XS17D3-T.

Does the MAX6385XS17D3-T require external components to operate, and what is the role of the MR pin?

No external components are required for basic operation of the MAX6385XS17D3-T. The MR (manual reset) pin features a built-in 63kΩ pullup resistor to VCC, allowing direct connection of a normally open switch to GND to force reset. When MR is pulled low, the device asserts RESET high for the full 140ms timeout period after release-no external debounce circuitry is needed, simplifying design and reducing BOM count for MAX6385XS17D3-T implementations.

Can the MAX6385XS17D3-T guarantee correct reset output behavior at very low supply voltages?

Yes-the MAX6385XS17D3-T guarantees valid reset output state down to VCC = 1.0V. Its push-pull architecture maintains VOH ≥ 0.8×VCC and VOL ≤ 0.3V across the entire 1.0V–5.5V operating range, ensuring interoperability with µPs that retain reset pin functionality at ultra-low VCC. This capability is explicitly tested and specified-not derived from extrapolation-for every MAX6385XS17D3-T unit.

What package type and dimensions does the MAX6385XS17D3-T use, and is it RoHS-compliant?

The MAX6385XS17D3-T uses a 4-pin SC70 package (outline 21-0098) measuring 1.3mm × 1.6mm × 0.95mm with a standard 0.65mm pin pitch. The "+T" suffix confirms lead(Pb)-free and RoHS-compliant construction. This compact footprint supports high-density layouts in portable and wearable electronics where board space is constrained for MAX6385XS17D3-T integration.

How does the MAX6385XS17D3-T handle short-duration power supply transients?

The MAX6385XS17D3-T incorporates negative-going VCC transient immunity: it ignores glitches narrower than ~140µs when the supply droop exceeds 100mV below the 1.67V threshold. This behavior is characterized in the "Maximum Transient Duration vs. Reset Comparator Overdrive" graph in the datasheet. Adding a 0.1μF ceramic capacitor close to the VCC pin further enhances noise rejection-critical for reliable operation of MAX6385XS17D3-T in electrically noisy environments like motor drives or switching power supplies.