Analog Devices Inc./Maxim Integrated MAX6385XS16D5-T

Overview

MAX6385XS16D5-T from Maxim Integrated is a precision active-high push-pull μP supervisory circuit designed for reliable power-on reset and brownout detection in low-voltage systems. It features a factory-set 1.58V reset threshold (±2.5% over −40°C to +125°C), 280ms minimum VCC reset timeout, 3μA supply current at 1.8V, and guaranteed valid reset output down to VCC = 1V. It is used in portable battery-powered equipment requiring stable, ultra-low-power reset assertion during voltage transients.

For engineers reviewing the MAX6385XS16D5-T datasheet, MAX6385XS16D5-T pinout, MAX6385XS16D5-T application, or MAX6385XS16D5-T equivalent, key selection criteria include its 1.58V threshold accuracy, 280ms timeout, active-high push-pull output logic, manual reset input with internal pullup, and 4-pin SC70 package compatibility with space-constrained embedded designs.

Technical Context

The MAX6385XS16D5-T implements a precision bandgap-based voltage comparator monitoring VCC against a fixed 1.58V threshold, with ±2.5% tolerance maintained across −40°C to +125°C. Its internal timer initiates a 280ms minimum reset assertion period upon VCC falling below threshold or MR being pulled low.

It integrates a debounced manual reset input (MR) with 63kΩ internal pullup resistor, supporting TTL/CMOS-compatible triggering and noise immunity via optional external capacitor. The active-high push-pull RESET output drives high during fault conditions and guarantees correct logic state down to VCC = 1V without external components.

Key Specifications

Pinout & Package

The MAX6385XS16D5-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), optimized for high-density PCB layouts with 0.65mm pitch and 1.3mm × 1.1mm footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6385XR16D5-T and TPS3123QDBVRQ1, the MAX6385XS16D5-T uniquely combines 1.58V threshold accuracy, 280ms timeout, active-high push-pull output, and integrated MR in a 4-pin SC70 - making it optimal for space-limited, battery-operated systems requiring both automatic and user-triggered reset control.

Availability

MAX6385XS16D5-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 with guaranteed long-term availability.

Supply support for MAX6385XS16D5-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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, computing, and communications markets.

The MAX6381–MAX6390 family was engineered to deliver ultra-low-power, precision reset supervision for battery-critical and thermally demanding applications - emphasizing threshold stability, minimal quiescent current, and robust transient immunity in miniature packages.

FAQ

What is the exact reset threshold voltage of the MAX6385XS16D5-T and how stable is it over temperature?

The MAX6385XS16D5-T has a factory-set reset threshold of 1.58V (minimum), with ±2.5% accuracy guaranteed over the full −40°C to +125°C operating range. This stability is achieved through precision bandgap referencing and laser trimming, ensuring reliable brownout detection without recalibration across automotive and industrial environments. The MAX6385XS16D5-T maintains this tolerance even under rapid thermal transients.

Does the MAX6385XS16D5-T support manual reset, and what are the electrical requirements for the MR pin?

Yes, the MAX6385XS16D5-T includes a dedicated MR (manual reset) input with an internal 63kΩ pullup resistor to VCC. To assert reset, drive MR below 0.3×VCC (for VTH < 4V); the minimum pulse width required is 1µs. The MR input rejects glitches up to 100ns and supports direct connection to TTL/CMOS logic or a momentary switch to GND. No external components are needed for basic operation of the MAX6385XS16D5-T.

What is the function and timing behavior of the RESET output on the MAX6385XS16D5-T?

The RESET output of the MAX6385XS16D5-T is an active-high push-pull driver. It goes high when VCC falls below 1.58V or MR is pulled low, and remains high for a minimum of 280ms after VCC rises above threshold or MR is released. The output is guaranteed valid down to VCC = 1V, and can source/sink ≥80µA at 1.0V - enabling direct interface to most microprocessor reset inputs without external level-shifting. This behavior is intrinsic to the MAX6385XS16D5-T design.

Can the MAX6385XS16D5-T operate from a 1.2V supply, and what happens to reset functionality at low VCC?

The MAX6385XS16D5-T operates from 1.0V to 5.5V, so it functions at 1.2V. While the internal reset comparator requires VCC ≥ 1.0V to maintain specified threshold accuracy, the RESET output remains logically valid (high during reset, low otherwise) down to VCC = 1V. Below 1.0V, the MAX6385XS16D5-T ceases operation, but the output state is not guaranteed - thus 1.0V is the functional lower limit for reliable reset assertion in the MAX6385XS16D5-T.

What package type and footprint does the MAX6385XS16D5-T use, and are there thermal considerations?

The MAX6385XS16D5-T uses a 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 1.3mm × 1.1mm with 0.65mm pin pitch. Its junction-to-ambient thermal resistance (θJA) is 322.6°C/W on a multilayer board. For continuous operation at maximum ambient temperature, keep power dissipation below 245mW (derating 3.1mW/°C above +70°C). Proper PCB copper pour under the exposed pad (if applicable) is recommended - though the MAX6385XS16D5-T's 3μA ICC minimizes self-heating.