Analog Devices Inc./Maxim Integrated MAX6385XS37D2-T

Overview

MAX6385XS37D2-T from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit with factory-set 3.70V reset threshold, 20ms minimum reset timeout, and manual reset input (MR), designed for reliable power-up/power-down monitoring in low-voltage embedded systems operating from +1.8V to +5.0V supply. It consumes only 3μA at +1.8V and guarantees valid reset output down to VCC = 1V.

For engineers reviewing the MAX6385XS37D2-T datasheet, MAX6385XS37D2-T pinout, MAX6385XS37D2-T application, or MAX6385XS37D2-T equivalent, key selection criteria include its active-high push-pull reset output, ±2.5% threshold accuracy over -40°C to +125°C, MR debounce capability, 4-pin SC70 package footprint, and compatibility with dual-voltage or battery-powered systems requiring precise brownout detection.

Technical Context

The MAX6385XS37D2-T implements a precision voltage comparator with internal 3.70V reference and a monostable timer that asserts RESET high for ≥20ms after VCC rises above threshold or after MR release. Its MR input features an internal 63kΩ pullup resistor and accepts TTL/CMOS logic levels.

It operates across full industrial temperature range (-40°C to +125°C) with guaranteed functionality down to VCC = 1V, supports negative-going VCC transient immunity up to 100mV overdrive, and maintains ±2.5% reset threshold accuracy across temperature without external components.

Key Specifications

Pinout & Package

MAX6385XS37D2-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 space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6385XS37D2-T, MAX6385XS37D3-T extends reset hold time for demanding boot sequences, while TLV809E33DBZR trades MR functionality and threshold precision for lower cost and smaller size in basic 3.3V monitoring roles.

Availability

MAX6385XS37D2-T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, portable medical sensors, and dual-voltage FPGA systems requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6385XS37D2-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 communications applications, emphasizing low power, high reliability, and small form factor.

The MAX6381–MAX6390 family delivers ultra-low-power microprocessor supervisory circuits with factory-trimmed thresholds, multiple reset timeout options, and MR support - engineered specifically for robust power monitoring in space- and energy-constrained embedded systems.

FAQ

What is the exact reset threshold voltage of MAX6385XS37D2-T and how accurate is it over temperature?

The MAX6385XS37D2-T has a factory-set nominal reset threshold of 3.70V, with guaranteed accuracy of ±2.5% over the full operating temperature range of -40°C to +125°C. This specification ensures reliable brownout detection for 3.3V I/O rails without requiring external calibration or trimming components. The MAX6385XS37D2-T achieves this stability using on-chip BiCMOS trimming and temperature-compensated reference design.

Does MAX6385XS37D2-T support manual reset, and what is the internal pullup resistance value?

Yes, MAX6385XS37D2-T includes a dedicated active-low manual reset input (MR) with an internal 63kΩ pullup resistor to VCC. This allows direct connection of a momentary switch to GND without external components. The MR input accepts standard TTL/CMOS logic levels and features built-in glitch rejection (100ns) and debouncing, making the MAX6385XS37D2-T suitable for field-service reset functions in industrial and automotive applications.

What package type and pin count does MAX6385XS37D2-T use, and is it RoHS-compliant?

MAX6385XS37D2-T is packaged in a 4-pin SC70 (SOT-323) outline, measuring 2.0mm × 2.1mm × 0.95mm, with land pattern number 90-0187. The "+T" suffix confirms it is lead(Pb)-free and RoHS-compliant. This compact RoHS-compliant package enables high-density PCB layouts in portable and automotive electronics where space and environmental compliance are critical requirements for the MAX6385XS37D2-T.

What is the minimum reset timeout period for MAX6385XS37D2-T, and how is it implemented?

The MAX6385XS37D2-T provides a minimum reset timeout period of 20ms, denoted by the "D2" suffix in its part number. This timeout is generated by an internal monostable timer that begins counting when VCC rises above the 3.70V threshold or when the MR input is released. The 20ms duration ensures sufficient hold time for microprocessor initialization and peripheral stabilization before releasing the active-high RESET signal - a key timing requirement verified in the MAX6385XS37D2-T electrical characteristics table.

Can MAX6385XS37D2-T operate reliably at very low supply voltages, and down to what VCC level is reset output guaranteed?

Yes, MAX6385XS37D2-T guarantees correct reset output logic state down to VCC = 1.0V, as specified in its absolute maximum ratings and electrical characteristics. This capability ensures deterministic behavior during deep brownout conditions where other supervisors may fail. The MAX6385XS37D2-T maintains valid active-high RESET assertion even as supply voltage collapses, enabling safe system shutdown and preventing undefined microprocessor states - a critical feature for battery-powered and safety-critical applications.