Analog Devices Inc./Maxim Integrated MAX6385XS17D3

Overview

MAX6385XS17D3 from Maxim Integrated is a low-power, active-high push-pull microprocessor supervisory circuit with factory-set 1.67V reset threshold, 140ms minimum reset timeout, and manual reset input (MR). It monitors VCC in systems operating from +1.8V to +5.0V, consumes only 3µA at +1.8V, and guarantees valid reset output down to VCC = 1V. It is used in portable battery-powered equipment requiring reliable power-on reset and brownout protection.

For engineers reviewing the MAX6385XS17D3 datasheet, MAX6385XS17D3 pinout, MAX6385XS17D3 application, or MAX6385XS17D3 equivalent, key selection criteria include its 1.67V threshold accuracy (±2.5% over –40°C to +125°C), MR debounce capability, SC70-4 package footprint, and compatibility with dual-voltage monitoring architectures.

Technical Context

The MAX6385XS17D3 implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy across –40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a guaranteed-minimum 140ms reset assertion after VCC rises above 1.67V or after MR release.

It features an internally pulled-up manual reset input (63kΩ pullup) that asserts reset on logic-low transition and maintains reset for the full 140ms timeout after MR returns high. The active-high push-pull RESET output drives high during reset and guarantees correct logic state down to VCC = 1V.

Key Specifications

Pinout & Package

MAX6385XS17D3 is housed in a lead-free 4-pin SC70 package (X4-1), measuring 2.0mm × 2.1mm × 0.95mm, suitable 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 MAX809S, MAX6385XS17D3 adds MR functionality in the same family footprint while reducing timeout to 140ms for faster recovery; compared with TPS3808G16, it cuts supply current by 75% at 1.8V and uses a smaller SC70-4 package, lowering system-level power and size.

Availability

MAX6385XS17D3 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 across extended temperature ranges and long production lifecycles.

Supply support for MAX6385XS17D3 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 power, sensing, and interface applications in industrial, automotive, and computing markets.

The MAX6381–MAX6390 family delivers ultra-low-power, factory-trimmed supervisory circuits optimized for battery-critical and thermally demanding embedded systems where reset reliability and minimal footprint are essential.

FAQ

What is the exact reset threshold voltage of MAX6385XS17D3 and how accurate is it over temperature?

The MAX6385XS17D3 has a factory-set reset threshold of 1.67V with ±2.5% accuracy over the full operating temperature range of –40°C to +125°C. This specification is guaranteed by design and ensures consistent brownout detection across automotive and industrial thermal profiles without requiring calibration. The 60ppm/°C tempco further limits drift to less than 20mV over the entire range.

Does MAX6385XS17D3 require an external pullup resistor on the MR pin?

No, MAX6385XS17D3 includes an internal 63kΩ pullup resistor on the MR pin, eliminating the need for an external component. This simplifies PCB layout and reduces BOM count. The MR pin is active-low and asserts reset when pulled to GND; leaving it unconnected defaults to VCC via the internal pullup, ensuring safe default operation.

What is the minimum VCC voltage at which MAX6385XS17D3 guarantees correct RESET output logic state?

MAX6385XS17D3 guarantees valid RESET output logic state down to VCC = 1.0V. Below this voltage, the internal circuitry may not maintain defined output levels. This feature ensures deterministic reset behavior during deep brownout conditions common in battery-depleted systems, preventing undefined MCU states during critical power transitions.

Can MAX6385XS17D3 be used in a system monitoring two independent voltage rails?

No, MAX6385XS17D3 monitors only the VCC rail and does not include the RESET IN auxiliary input found in MAX6387–MAX6389 variants. For dual-rail monitoring, consider MAX6387XS17D3 (which adds a +1.27V-referenced auxiliary comparator) or implement a second supervisory device. The MAX6385XS17D3 is strictly a single-supply monitor with manual reset capability.

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

MAX6385XS17D3 uses a lead-free 4-pin SC70 package (X4-1), with nominal dimensions of 2.0mm × 2.1mm × 0.95mm. It is RoHS-compliant and marked with a "+" suffix per Maxim's ordering convention. The small outline supports high-density layouts in portable and wearable electronics where board space is at a premium.