Analog Devices Inc./Maxim Integrated MAX6394US317D2+T

Overview

MAX6394US317D2+T from Maxim Integrated is a low-power CMOS microprocessor supervisory circuit that monitors VCC supply voltage and asserts an active-low open-drain RESET signal when voltage falls below 3.168V or when manual reset (MR) is asserted. It features ±1.0% threshold accuracy over –40°C to +125°C, 14ms minimum reset timeout, 5µA supply current, and operates from 1.0V to 5.5V - used in battery-powered controllers and critical μP power monitoring.

For engineers reviewing the MAX6394US317D2+T datasheet, MAX6394US317D2+T pinout, MAX6394US317D2+T application, or MAX6394US317D2+T equivalent, key selection criteria include factory-trimmed 3.168V reset threshold, SOT143-4 package compatibility, MR input debounce capability, open-drain RESET level-shifting up to 6V, and AEC-Q100 qualification for automotive-grade reliability.

Technical Context

The MAX6394US317D2+T implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider to set its nominal 3.168V reset threshold, maintaining ±1.0% accuracy across –40°C to +125°C. Its internal timer generates a fixed 14ms minimum reset timeout after VCC recovery or MR deassertion.

It uses an open-drain n-channel MOSFET for RESET output, enabling pull-up to any voltage ≤6V - including supplies higher than VCC - and includes an internal 63kΩ MR pullup resistor, eliminating external components for basic manual reset functionality.

Key Specifications

Pinout & Package

MAX6394US317D2+T is housed in a 4-pin SOT143-4 (also referenced as U4+1/U4+1A) surface-mount package, measuring 1.3mm × 2.9mm × 1.0mm, with gull-wing leads and RoHS-compliant finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV809K33DBZR and TPS3808G33DBVR, the MAX6394US317D2+T delivers factory-set 3.168V threshold with tighter ±1.0% tolerance, integrated MR with internal pullup, and fixed 14ms timeout - offering plug-and-play reliability in space- and power-constrained automotive and industrial controllers without external components.

Availability

MAX6394US317D2+T is available at Aetrix Electronics and suitable for industrial controllers, automotive body electronics, and portable medical sensors requiring stable component supply, long-term lifecycle support, and AEC-Q100–qualified performance.

Supply support for MAX6394US317D2+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 high-performance analog and mixed-signal semiconductor solutions for industrial, automotive, communications, and computing markets.

The MAX6394US317D2+T belongs to Maxim's high-accuracy μP supervisory product line, engineered specifically for robust power-monitoring in safety-critical and thermally demanding embedded systems.

FAQ

What is the exact reset threshold voltage of the MAX6394US317D2+T?

The MAX6394US317D2+T has a factory-trimmed nominal reset threshold of 3.168V, with guaranteed tolerance of ±1.0% over the full –40°C to +125°C operating temperature range. This value is confirmed in Table 2 of the official datasheet and corresponds directly to the "317" suffix in the part number.

Does the MAX6394US317D2+T require external components to operate?

No, the MAX6394US317D2+T operates autonomously with no external components required: it includes an internal 63kΩ pullup on MR and laser-trimmed resistive divider for threshold setting. Only an external pullup resistor on RESET (e.g., 10kΩ) is needed to define the logic-high level - no capacitors, resistors, or adjustments are necessary for basic supervision.

What is the reset timeout period for the MAX6394US317D2+T?

The MAX6394US317D2+T features a fixed minimum reset timeout period of 14ms, corresponding to the "D2" suffix. The actual timeout ranges from 14ms (min) to 40ms (max) depending on process and temperature, as specified in the Electrical Characteristics table under tRP for MAX6394US___D2-T variants.

Can the RESET output of the MAX6394US317D2+T be pulled up to a voltage higher than VCC?

Yes, the MAX6394US317D2+T's RESET output is an open-drain structure rated to 6.0V, allowing it to be pulled up to any voltage between 0V and 6V - including supplies higher than VCC. This enables level-shifted reset signaling, such as driving a 5V reset line from a 3.3V-supplied MAX6394US317D2+T.

Is the MAX6394US317D2+T qualified for automotive applications?

Yes, the MAX6394US317D2+T is AEC-Q100 qualified (Grade 0, –40°C to +125°C), as explicitly stated in the Benefits and Features section and Ordering Information. This qualification covers stress testing for temperature cycling, humidity, and ESD - confirming suitability for automotive body control, infotainment, and ADAS subsystems.