Analog Devices Inc./Maxim Integrated MAX6385XS32D3-T

Overview

MAX6385XS32D3-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 3.20V ±2.5% reset threshold, and 140ms minimum VCC reset timeout. It monitors single supply voltage (1.0V to 5.5V), consumes only 3μA at 1.8V, and guarantees valid reset state down to VCC = 1V - used in portable battery-powered equipment for reliable power-up sequencing.

For engineers reviewing the MAX6385XS32D3-T datasheet, MAX6385XS32D3-T pinout, MAX6385XS32D3-T application, or MAX6385XS32D3-T equivalent, key selection criteria include reset threshold accuracy over -40°C to +125°C, manual reset input with internal 63kΩ pullup, immunity to negative-going VCC transients, and compatibility with SC70-4 packaging for space-constrained embedded designs.

Technical Context

This device implements a precision bandgap-based reset comparator with ±2.5% threshold accuracy across temperature, paired with a monolithic timer generating a guaranteed-minimum 140ms reset assertion after VCC recovery. The active-high push-pull output drives directly into μP reset inputs without external pullups.

It features a debounced manual reset input (MR) with 1μs minimum pulse width support and 100ns glitch rejection, internally pulled up to VCC via 63kΩ. MR-to-reset delay is 200ns, and reset assertion remains valid even as VCC drops to 1V - enabling robust operation during brownout conditions.

Key Specifications

Pinout & Package

MAX6385XS32D3-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 MAX6385XS32D3-T, the MAX6385XS32D3+T offers identical supervision performance with updated environmental compliance, while the TPS3808G33DBVR trades manual reset and push-pull simplicity for tighter threshold tolerance and broader supply range - making it suitable only where MR is unused and layout allows SOT-23-5 placement.

Availability

MAX6385XS32D3-T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, industrial controllers, medical handsets, and automotive body control modules requiring stable component supply and long-term lifecycle support.

Supply support for MAX6385XS32D3-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 power, sensing, and interface applications, with emphasis on low-power, high-reliability solutions.

The MAX6381–MAX6390 family delivers single-supply microprocessor reset supervision with ultra-low current, factory-trimmed thresholds, and multiple output configurations - engineered for battery longevity and robustness in portable, industrial, and automotive systems.

FAQ

What is the exact reset threshold voltage of MAX6385XS32D3-T and how tightly is it specified?

The MAX6385XS32D3-T has a factory-set reset threshold of 3.20V, guaranteed between 3.12V (min) and 3.28V (max) at +25°C, and maintained within ±2.5% (i.e., 3.12V to 3.28V) over the full –40°C to +125°C operating temperature range. This specification is confirmed in the Electrical Characteristics table of the official datasheet and applies specifically to the XS32 suffix variant.

Does MAX6385XS32D3-T include a manual reset input, and what is its default configuration?

Yes, MAX6385XS32D3-T includes an active-low manual reset input (MR) with an internal 63kΩ pullup resistor to VCC. When left unconnected, MR remains high and does not trigger reset; pulling MR low for ≥1μs forces reset assertion for the full 140ms timeout period. This feature is explicitly documented in the Pin Description and Features sections for the MAX6385 series.

What package type and dimensions does MAX6385XS32D3-T use, and is it RoHS-compliant?

MAX6385XS32D3-T uses a 4-pin SC70 package (outline 21-0098), measuring 2.0mm × 2.1mm × 0.95mm. The "+T" suffix confirms it is lead(Pb)-free and RoHS-compliant per Maxim Integrated's ordering conventions. Land pattern number 90-0187 is specified for PCB layout, and thermal resistance θJA is 322.6°C/W on multilayer board.

How does the reset output behave during deep undervoltage conditions, and down to what VCC level is it guaranteed?

The MAX6385XS32D3-T reset output is guaranteed to maintain correct logic state - high during reset, low otherwise - down to VCC = 1.0V. Below this, output behavior is not specified. This guarantee is explicitly stated in the Absolute Maximum Ratings and Detailed Description sections, ensuring deterministic reset assertion during severe brownout events before total power loss.

Is MAX6385XS32D3-T pin-compatible with older Maxim reset ICs like MAX809 or MAX6326?

Yes, MAX6385XS32D3-T is pin-compatible with MAX809, MAX810, MAX803, MAX6326, MAX6327, MAX6328, MAX6346, MAX6347, MAX6348, and MAX6711/MAX6712/MAX6713 - as confirmed in the Features section of the datasheet. All share the same 4-pin SC70 pinout (VCC, RESET, MR, GND), enabling drop-in replacement without PCB redesign.