Analog Devices Inc./Maxim Integrated MAX6385XS35D3-T

Overview

MAX6385XS35D3-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 3.50V reset threshold (±2.5% over –40°C to +125°C), 140ms minimum VCC reset timeout, and debounced manual reset input (MR). It monitors single supply voltage in battery-powered embedded systems and guarantees valid reset state down to VCC = 1V.

For engineers reviewing the MAX6385XS35D3-T datasheet, MAX6385XS35D3-T pinout, MAX6385XS35D3-T application, or MAX6385XS35D3-T equivalent, key selection criteria include reset polarity compatibility, MR timing behavior, SC70-4 package footprint, ±2.5% threshold accuracy across automotive temperature range, and guaranteed operation at 1.0V VCC.

Technical Context

The MAX6385XS35D3-T implements a precision bandgap-based reset comparator with 60ppm/°C tempco and internal 140ms reset timeout timer. Its MR input features a 63kΩ internal pullup resistor and supports TTL/CMOS logic levels, enabling direct switch or logic-driven reset assertion without external components.

It operates across 1.0V–5.5V VCC and asserts active-high RESET when VCC falls below 3.50V or MR is pulled low. Reset remains asserted for ≥140ms after VCC recovers above threshold or MR is released - a fixed delay independent of supply voltage or temperature variation.

Key Specifications

Pinout & Package

MAX6385XS35D3-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, 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 MAX6385XS35D2-T and TPS3808G33DBVR, MAX6385XS35D3-T provides longer reset hold time for slower-booting processors, tighter threshold tolerance at 3.50V, and integrated MR pullup - reducing component count and improving reliability in compact, battery-sensitive designs.

Availability

MAX6385XS35D3-T is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, portable medical sensors, smart energy meters, and battery-powered instrumentation requiring stable component supply across extended temperature ranges.

Supply support for MAX6385XS35D3-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 demanding industrial, automotive, and computing applications, with emphasis on low-power, high-reliability solutions.

The MAX6381–MAX6390 family delivers single/dual low-voltage supervisory circuits optimized for space-constrained, battery-operated, and automotive-grade systems requiring guaranteed reset behavior across wide voltage and temperature ranges.

FAQ

What is the exact reset threshold voltage of MAX6385XS35D3-T and how stable is it over temperature?

The MAX6385XS35D3-T has a factory-set nominal reset threshold of 3.50V, 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 threshold drift is limited to approximately ±17.5mV across the entire range - critical for consistent brownout detection in automotive and industrial environments where MAX6385XS35D3-T is deployed.

Does MAX6385XS35D3-T support manual reset, and what are the electrical requirements for the MR pin?

Yes, MAX6385XS35D3-T includes a debounced manual reset input (MR) with an internal 63kΩ pullup resistor to VCC. To assert reset, drive MR below 0.3×VCC (for VTH < 4V) or below 0.8V (for VTH > 4V). The MR input accepts TTL/CMOS logic levels and tolerates pulses as short as 1µs. No external components are needed - a normally open switch from MR to GND suffices. This behavior is explicitly confirmed for MAX6385XS35D3-T in the datasheet's Pin Description and Applications Information sections.

What package type and footprint does MAX6385XS35D3-T use, and is it RoHS-compliant?

MAX6385XS35D3-T uses a 4-pin SC70 package (outline number 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm. The "+T" suffix confirms lead(Pb)-free/RoHS-compliance per JEDEC J-STD-609. This compact, surface-mount package supports high-density PCB layouts in portable and automotive electronics where MAX6385XS35D3-T is commonly applied.

Can MAX6385XS35D3-T operate reliably at very low supply voltages, and what is its minimum functional VCC?

Yes, MAX6385XS35D3-T guarantees correct reset output logic state down to VCC = 1.0V - well below its 3.50V reset threshold. This ensures the reset signal remains valid during deep brownout conditions or final battery discharge phases. The device continues to monitor VCC and assert RESET correctly until VCC drops below 1.0V, a capability explicitly specified in the Absolute Maximum Ratings and Electrical Characteristics tables for MAX6385XS35D3-T.

How does the reset timeout behavior differ between VCC recovery and manual reset release on MAX6385XS35D3-T?

For MAX6385XS35D3-T, both VCC recovery and MR release trigger the same 140ms minimum reset timeout period. When VCC rises above 3.50V or MR transitions from low to high, the active-high RESET output remains asserted for ≥140ms before deasserting. This uniform timing simplifies system timing analysis and eliminates ambiguity in reset release sequencing - a key design feature confirmed in the General Description and Reset Timeout Delay table for MAX6385XS35D3-T.