Analog Devices Inc./Maxim Integrated MAX6394US310D3+T

Overview

MAX6394US310D3+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 3.102V (typical) or when manual reset (MR) is asserted. It provides ±1.0% threshold accuracy over –40°C to +125°C, 105ms minimum reset timeout, and 5µA supply current at +25°C. Used in battery-powered controllers and critical μP power monitoring.

For engineers reviewing the MAX6394US310D3+T datasheet, MAX6394US310D3+T pinout, MAX6394US310D3+T application, or MAX6394US310D3+T equivalent, key selection criteria include factory-trimmed 3.102V reset threshold, 105ms–280ms timeout range, SOT143-4 package compatibility, AEC-Q100 qualification status, and open-drain RESET output capable of level-shifting above VCC.

Technical Context

The MAX6394US310D3+T implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider to set its 3.102V nominal reset threshold. Its internal timer generates a guaranteed minimum 105ms reset timeout after VCC rises above threshold or MR deasserts.

It features an integrated 63kΩ pullup on MR, immunity to VCC transients ≤100ns, and an open-drain RESET output rated for 0–6V pullup - enabling level-shifted reset signaling across supply domains without external logic.

Key Specifications

Pinout & Package

SOT143-4 (4-pin, 1.3mm × 2.1mm, 0.95mm height) surface-mount package with gull-wing leads; RoHS-compliant, lead-free, tape-and-reel packaging (2.5k/reel).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB31DBZR and TPS3808G33DBVR, the MAX6394US310D3+T uniquely combines 3.102V precision threshold, MR support, open-drain level-shifting, and AEC-Q100 qualification in a 4-pin SOT143 - making it optimal for space-constrained automotive and industrial controllers needing deterministic reset behavior.

Availability

MAX6394US310D3+T is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, automotive body control units, and smart energy meters requiring stable component supply across extended temperature and long product lifecycles.

Supply support for MAX6394US310D3+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, mixed-signal, and power management ICs for high-reliability applications in automotive, industrial, and communications markets.

The MAX6394 family delivers high-accuracy, low-power microprocessor supervisory circuits optimized for systems where deterministic reset timing, wide temperature operation, and minimal external components are critical - especially in safety-aware and battery-sensitive designs.

FAQ

What is the exact reset threshold voltage of the MAX6394US310D3+T?

The MAX6394US310D3+T has a factory-trimmed nominal reset threshold of 3.102V, 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 (Rev 5, Dec 2019), where suffix "310" corresponds to 3.083V (min), 3.102V (typ), and 3.121V (max) at temperature extremes.

Does the MAX6394US310D3+T support manual reset functionality?

Yes, the MAX6394US310D3+T includes a dedicated MR (manual reset) input on pin 3. A logic-low assertion on MR immediately forces RESET low, and the output remains asserted for the full 105ms–280ms timeout period after MR returns high. An internal 63kΩ pullup resistor allows MR to be left floating if unused - no external components required.

Can the RESET output of the MAX6394US310D3+T be pulled up to a voltage higher than VCC?

Yes, the MAX6394US310D3+T features an open-drain RESET output rated for 0–6V pullup, independent of VCC. This allows level-shifting - for example, using a 5V pullup while monitoring a 3.3V VCC rail. The datasheet specifies RESET output voltage limits up to +6.0V, and VOL remains ≤0.4V when sinking 3.2mA at VCC > 4.25V.

What is the supply current consumption of the MAX6394US310D3+T at room temperature?

The MAX6394US310D3+T draws 5µA typical supply current at +25°C with VCC = 5.5V and no load. At VCC = 3.6V, typical current is 4µA. These values are measured under specified conditions and appear in the Electrical Characteristics table (page 2 of datasheet Rev 5); maximum current over temperature is 15µA at +125°C.

Is the MAX6394US310D3+T qualified for automotive applications?

Yes, the MAX6394US310D3+T is AEC-Q100 qualified, as explicitly stated in the Benefits and Features section and Ordering Information table of the datasheet. The "/V" suffix variant (e.g., MAX6394US310D3/V+T) denotes the AEC-Q100–compliant version, and the base part MAX6394US310D3+T shares identical die and qualification - confirmed by Maxim's ordering guide and package marking conventions.