Analog Devices Inc./Maxim Integrated MAX6385XS16D2

Overview

The MAX6385XS16D2 from Maxim Integrated is a low-power, active-high push-pull microprocessor supervisory circuit with factory-set 1.58V reset threshold, 140ms minimum reset timeout, and manual reset input. It monitors VCC in systems powered by +1.8V to +5.0V rails, consumes only 3µA at +1.8V, and guarantees valid reset output down to VCC = 1V. Used in portable battery-powered equipment for reliable power-on reset and brownout protection.

For engineers reviewing the MAX6385XS16D2 datasheet, MAX6385XS16D2 pinout, MAX6385XS16D2 application, or MAX6385XS16D2 equivalent, key selection criteria include its 1.58V threshold accuracy (±2.5% over –40°C to +125°C), SC70-4 package footprint, MR debounced manual reset capability, and immunity to negative-going VCC transients up to 35µs at 100mV overdrive.

Technical Context

This device implements a precision bandgap-based voltage comparator with internal 1.58V reference and a monolithic timer for deterministic reset assertion timing. The reset output remains high for ≥140ms after VCC rises above threshold, ensuring µP initialization completes before release.

The integrated 63kΩ internal pullup on MR enables direct connection to a momentary switch to GND without external components, while the push-pull active-high architecture eliminates need for external pullup resistors and supports direct interface to µP reset inputs requiring high-true logic.

Key Specifications

Pinout & Package

MAX6385XS16D2 is housed in a lead-free 4-pin SC70 package (X4-1, 1.25mm × 1.25mm × 0.9mm), optimized for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809S, MAX6385XS16D2 adds MR functionality and extends timeout to 140ms for complex boot sequences; versus TPS3808G15, it trades 0.03V threshold tolerance and 5µA ICC for 30% smaller SC70-4 footprint and lower cost in volume.

Availability

MAX6385XS16D2 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and smart home hub power management requiring stable component supply across extended temperature ranges.

Supply support for MAX6385XS16D2 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 reliability and low-power operation.

The MAX6381–MAX6390 family was engineered specifically for space- and power-constrained µP supervision in battery-powered and automotive systems, delivering factory-trimmed thresholds and guaranteed timing without external components.

FAQ

What is the exact reset threshold voltage of the MAX6385XS16D2?

The MAX6385XS16D2 has a factory-set reset threshold of 1.58V, specified with ±2.5% accuracy over the full operating temperature range of –40°C to +125°C. This value is laser-trimmed during production and does not require external calibration. The threshold is referenced to the internal bandgap and remains stable against supply ripple and noise, making it suitable for precise 1.8V rail monitoring in the MAX6385XS16D2.

Does the MAX6385XS16D2 require an external pullup resistor on the RESET pin?

No, the MAX6385XS16D2 features an active-high push-pull RESET output, which actively drives both high and low states without requiring external biasing. Unlike open-drain variants, this architecture eliminates the need for a pullup resistor, reducing component count and PCB area. The output meets VOL ≤0.3V at 1.2mA sink and VOH ≥0.8×VCC at 500µA source, ensuring robust interfacing with standard µP reset inputs in the MAX6385XS16D2.

How does the manual reset (MR) function work on the MAX6385XS16D2?

The MR pin on the MAX6385XS16D2 is an active-low, internally debounced input with a 63kΩ pullup resistor to VCC. Driving MR low forces an immediate reset assertion, which remains active for the full 140ms timeout after MR returns high. No external debounce circuitry is needed - the internal digital filter rejects glitches <1µs. This makes the MAX6385XS16D2 ideal for pushbutton reset integration in handheld and field-serviceable equipment.

Can the MAX6385XS16D2 operate reliably at VCC = 1.0V?

Yes, the MAX6385XS16D2 guarantees correct reset output logic state down to VCC = 1.0V, as confirmed in the Electrical Characteristics table. Below this voltage, the internal comparator and timer may cease functioning, but the output remains latched in its last valid state. This behavior ensures deterministic µP reset assertion during deep brownout conditions, a critical requirement validated across all production units of the MAX6385XS16D2.

What package type and dimensions does the MAX6385XS16D2 use?

The MAX6385XS16D2 is packaged in a lead-free 4-pin SC70 (X4-1) case measuring 1.25mm × 1.25mm × 0.9mm, with standard 0.65mm pin pitch. This ultra-compact footprint is pin-compatible with other SC70-4 supervisory devices and supports fine-pitch reflow assembly. The package drawing is documented under Maxim part number 21-0098, and thermal performance is characterized with 245mW dissipation at +70°C ambient in the MAX6385XS16D2 datasheet.