Analog Devices Inc./Maxim Integrated MAX6385XS16D3+T

Overview

MAX6385XS16D3+T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 1.58V reset threshold (±2.5% over –40°C to +125°C), 140ms minimum VCC reset timeout, and debounced manual reset input. It monitors single supply voltage in battery-powered embedded systems where reliable power-on reset and brownout protection are critical.

For engineers reviewing the MAX6385XS16D3+T datasheet, MAX6385XS16D3+T pinout, MAX6385XS16D3+T application, or MAX6385XS16D3+T equivalent, key selection factors include its 3μA supply current at 1.8V, guaranteed reset validity down to VCC = 1V, 4-pin SC70 package footprint, and compatibility with manual reset switch integration without external debounce.

Technical Context

The MAX6385XS16D3+T implements a precision bandgap-based reset comparator with ±2.5% threshold accuracy across –40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a fixed 140ms minimum reset assertion period after VCC rises above 1.58V.

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 63kΩ internal pullup resistor-asserting reset when pulled low and holding it for 140ms after release.

Key Specifications

Pinout & Package

MAX6385XS16D3+T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 1.25mm × 1.65mm × 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 MAX6326XR16D3+T, MAX6385XS16D3+T offers simplified interface via push-pull output and integrated MR; compared with TPS3123E16DBVR, it trades higher current and looser threshold tolerance for manual reset capability and pin compatibility with existing Maxim supervisory layouts.

Availability

MAX6385XS16D3+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, critical μP and μC power monitoring, and intelligent instruments requiring stable component supply throughout product lifecycles.

Supply support for MAX6385XS16D3+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 industrial, automotive, communications, and computing applications.

The MAX6381–MAX6390 family delivers low-power, factory-trimmed reset supervision in miniature SC70/μDFN packages, targeting space- and energy-constrained embedded systems needing reliable power-on and brownout reset functionality.

FAQ

What is the exact reset threshold voltage of MAX6385XS16D3+T and how stable is it over temperature?

The MAX6385XS16D3+T has a factory-set reset threshold of 1.58V, with guaranteed accuracy of ±2.5% over the full operating temperature range of –40°C to +125°C. Its temperature coefficient is 60ppm/°C, meaning the threshold drifts less than 15mV across the entire range - sufficient for stable brownout detection in industrial-grade applications without recalibration.

Does MAX6385XS16D3+T support manual reset, and what are the electrical requirements for the MR pin?

Yes, MAX6385XS16D3+T includes a debounced manual reset (MR) input with a 63kΩ internal pullup resistor to VCC. To assert reset, drive MR below 0.3×VCC (e.g., <0.54V at VCC = 1.8V); the device holds reset active for the full 140ms timeout after MR is released. No external debounce components are needed, and MR accepts TTL/CMOS logic levels.

What package type and dimensions does MAX6385XS16D3+T use, and is it RoHS-compliant?

MAX6385XS16D3+T is supplied in a lead(Pb)-free, RoHS-compliant 4-pin SC70 package (outline 21-0098), measuring 1.25mm × 1.65mm × 0.95mm. The "+T" suffix confirms tape-and-reel packaging with RoHS compliance, and the land pattern number is 90-0187 - compatible with standard reflow soldering profiles including peak temperatures up to +260°C.

Can MAX6385XS16D3+T operate reliably at very low supply voltages, and what happens to the RESET output below 1.8V?

Yes, MAX6385XS16D3+T is fully specified down to VCC = 1.0V and guarantees correct RESET output logic state (high during reset, low otherwise) for all VCC ≥ 1V. Below 1V, the output may become indeterminate, but the 1.58V threshold ensures reset remains asserted until VCC recovers sufficiently - critical for graceful shutdown in battery-depleted scenarios.

How does the reset timeout behavior differ between power-up and manual reset events for MAX6385XS16D3+T?

MAX6385XS16D3+T uses the same 140ms minimum timeout period for both VCC-related and MR-initiated resets. When VCC rises above 1.58V, reset deasserts after ≥140ms; similarly, when MR is released, reset deasserts after ≥140ms - ensuring consistent initialization timing regardless of reset trigger source, simplifying system-level timing analysis.