Analog Devices Inc./Maxim Integrated MAX6394US317D2/V+T

Overview

MAX6394US317D2/V+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 upon manual reset assertion. It delivers ±1.0% threshold accuracy over –40°C to +125°C, features a factory-set 14ms minimum reset timeout, and operates with only 5µA supply current at +25°C. It is used in battery-powered controllers and critical μP power monitoring systems.

For engineers reviewing the MAX6394US317D2/V+T datasheet, MAX6394US317D2/V+T pinout, MAX6394US317D2/V+T application, or MAX6394US317D2/V+T equivalent, key selection criteria include its 3.168V reset threshold, 14ms timeout, SOT143-4 package, AEC-Q100 qualification (/V suffix), and open-drain output capable of level-shifting above VCC.

Technical Context

The MAX6394US317D2/V+T implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider to set the 3.168V nominal reset threshold. Its reset timeout is generated by an internal RC timer calibrated for 14ms (min) at TA = +25°C, with ±20% variation across temperature.

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. The device is immune to transients <100ns and rejects VCC glitches down to 35µs duration.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB33DBZR and ADM6315-33ARTZ-RL7, the MAX6394US317D2/V+T uniquely combines AEC-Q100 qualification, 14ms timeout, manual reset input, and ±1.0% threshold accuracy in SOT143-4 - making it the only option qualified for demanding automotive and industrial reset supervision where precise timing and field serviceability matter.

Availability

MAX6394US317D2/V+T is available at Aetrix Electronics and suitable for automotive body control modules, portable medical diagnostics, and industrial sensor nodes requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.

Supply support for MAX6394US317D2/V+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 ICs for automotive, industrial, communications, and computing markets.

The MAX6394 series was developed specifically for high-reliability microprocessor reset supervision in harsh environments - emphasizing precision threshold stability, ultra-low power, and integrated transient immunity without external components.

FAQ

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

The MAX6394US317D2/V+T has a factory-trimmed nominal reset threshold of 3.168V, with guaranteed tolerance of ±1.0% over the full operating temperature range (–40°C to +125°C). This value is confirmed in Table 2 of the official datasheet and corresponds to the "317" suffix in the part number. The MAX6394US317D2/V+T maintains this accuracy without external calibration or trimming components.

Does the MAX6394US317D2/V+T support manual reset functionality?

Yes, the MAX6394US317D2/V+T includes a dedicated MR (manual reset) input on pin 3. A logic-low signal on MR asserts RESET immediately and holds it active for the full 14ms timeout period after MR returns high. An internal 63kΩ pullup resistor allows MR to be left floating if unused, and no external debounce circuitry is required - simplifying design and reducing BOM count for the MAX6394US317D2/V+T.

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

The MAX6394US317D2/V+T uses the D2 timeout option, providing a minimum reset timeout period of 14ms after VCC rises above the 3.168V threshold or after MR is deasserted. Typical and maximum values are 28ms and 40ms respectively, as specified in the Electrical Characteristics table. This timing is internally generated and does not require external capacitors - a key design advantage of the MAX6394US317D2/V+T.

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

Yes, the RESET output of the MAX6394US317D2/V+T is an active-low open-drain n-channel MOSFET rated for up to +6.0V. It can be pulled up to any voltage between 0V and 6V - including supplies higher than VCC - enabling level-shifted reset signaling across mixed-voltage domains. This capability is explicitly guaranteed in the Absolute Maximum Ratings and is a defining feature of the MAX6394US317D2/V+T's architecture.

Is the MAX6394US317D2/V+T qualified for automotive applications?

Yes, the MAX6394US317D2/V+T carries the /V suffix, indicating AEC-Q100 qualification for Grade 0 (–40°C to +125°C). This certification covers stress testing for temperature cycling, humidity, ESD, and mechanical shock - confirming suitability for automotive powertrain, body electronics, and ADAS subsystems. The /V+T packaging denotes tape-and-reel delivery with lead-free finish, fully aligned with automotive manufacturing requirements for the MAX6394US317D2/V+T.