Analog Devices Inc./Maxim Integrated MAX6394US480D3/V+T

Overview

MAX6394US480D3/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 4.800V or when manual reset (MR) is asserted. It features ±1.0% threshold accuracy over –40°C to +125°C, 105ms minimum reset timeout period, 5µA supply current, and SOT143-4 package. It is used in battery-powered controllers for reliable brownout detection.

For engineers reviewing the MAX6394US480D3/V+T datasheet, MAX6394US480D3/V+T pinout, MAX6394US480D3/V+T application, or MAX6394US480D3/V+T equivalent, key selection criteria include factory-trimmed 4.8V reset threshold, 105ms timeout, AEC-Q100 qualification (/V suffix), open-drain output compatible with supplies up to 6V, and immunity to sub-100ns MR glitches.

Technical Context

The MAX6394US480D3/V+T implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider setting nominal VTH = 4.800V, validated across –40°C to +125°C with ±1.0% tolerance. Its internal timer generates a fixed 105ms (min) reset timeout after VCC recovery or MR deassertion.

It uses an open-drain n-channel MOSFET for RESET output, enabling level-shifting - e.g., monitoring a 5V rail while pulling RESET to a 3.3V domain. MR includes a 63kΩ internal pullup and rejects transients <100ns, eliminating need for external debounce.

Key Specifications

Pinout & Package

SOT143-4 (4-pin, 1.3mm × 2.9mm, 0.95mm height), RoHS-compliant, 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 TLV809K48DBZR and ADM6315-48ARTZ-R7, the MAX6394US480D3/V+T uniquely combines AEC-Q100 qualification, precise ±1.0% threshold, integrated MR with internal pullup, and open-drain level-shifting - making it optimal for automotive and safety-critical embedded reset applications where reliability and flexibility are co-prioritized.

Availability

MAX6394US480D3/V+T is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLCs, and portable medical devices requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.

Supply support for MAX6394US480D3/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 precision analog, mixed-signal, and power-management ICs for demanding industrial, automotive, and computing applications.

The MAX6394 series delivers high-accuracy, low-power µP reset supervision for systems where supply integrity directly impacts functional safety - especially in automotive ECUs and battery-operated instrumentation.

FAQ

What is the exact reset threshold voltage of the MAX6394US480D3/V+T?

The MAX6394US480D3/V+T has a factory-trimmed nominal reset threshold of 4.800V, with guaranteed tolerance of ±1.0% over the full –40°C to +125°C operating temperature range. At +25°C, accuracy tightens to ±0.6%, yielding a range of 4.771V to 4.829V per Table 1 in the datasheet. This precision eliminates need for external calibration in critical power-monitoring applications.

Does the MAX6394US480D3/V+T support manual reset, and how is it implemented?

Yes, the MAX6394US480D3/V+T supports manual reset via its MR pin (Pin 3). A logic-low assertion on MR forces RESET active regardless of VCC level. The device includes a 63kΩ internal pullup resistor, so MR may be left floating if unused. For pushbutton use, connect a normally open switch between MR and GND - no external debounce components are needed due to built-in 100ns glitch rejection.

What is the reset timeout period for the MAX6394US480D3/V+T, and is it adjustable?

The MAX6394US480D3/V+T has a fixed minimum reset timeout period of 105ms, corresponding to the "D3" suffix in its part number. This value is factory-programmed and not user-adjustable. The actual timeout ranges from 105ms (min) to 280ms (max) across temperature and unit variation, as specified in the Electrical Characteristics table. It ensures sufficient hold time for microprocessor initialization after power recovery.

Can the RESET output of the MAX6394US480D3/V+T be pulled up to a voltage higher than VCC?

Yes, the RESET output of the MAX6394US480D3/V+T is an open-drain n-channel MOSFET rated for up to 6.0V. This allows the output to be pulled up to a voltage higher than VCC - for example, monitoring a 5V rail while pulling RESET to a separate 3.3V logic domain. The datasheet explicitly permits this level-shifting use case and specifies VOL ≤0.4V at ISINK = 3.2mA when VCC > 4.25V.

Is the MAX6394US480D3/V+T qualified for automotive applications?

Yes, the MAX6394US480D3/V+T carries the "/V" suffix, indicating AEC-Q100 qualification for automotive applications. It is tested and certified across the –40°C to +125°C temperature range per AEC-Q100 Rev H stress requirements, including HTOL, TCT, and ESD. This makes it suitable for body electronics, infotainment power rails, and other non-safety-critical but reliability-demanding automotive subsystems.