Analog Devices Inc./Maxim Integrated MAX6394US480D3+T

Overview

MAX6394US480D3+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 VCC drops below 4.800 V (±1.0% over −40°C to +125°C) or when manual reset (MR) is asserted. It features a factory-trimmed 105 ms minimum reset timeout period, 5 µA typical supply current at +25°C, and operates across 1.0 V to 5.5 V. It is used in critical μP power monitoring for automotive-grade embedded systems requiring high threshold accuracy and transient immunity.

For engineers reviewing the MAX6394US480D3+T datasheet, MAX6394US480D3+T pinout, MAX6394US480D3+T application, or MAX6394US480D3+T equivalent, key selection criteria include its ±1.0% reset threshold tolerance over full temperature range, SOT143-4 package compatibility, 105 ms reset timeout option, and AEC-Q100 qualification status for automotive applications.

Technical Context

The MAX6394US480D3+T implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider to set the 4.800 V reset threshold, and integrates a monostable timer to enforce a minimum 105 ms reset pulse width after VCC recovery or MR deassertion. Its open-drain RESET output supports level-shifting up to +6.0 V independent of VCC.

It features internal MR pullup (63 kΩ), 100 ns MR glitch rejection, and immunity to short VCC transients - validated by maximum transient duration vs. reset threshold overdrive curves. The device draws only 5 µA at VCC = 5.5 V and +25°C, enabling use in battery-powered equipment.

Key Specifications

Pinout & Package

SOT143-4 (4-pin plastic surface-mount package, 1.3 mm × 2.9 mm footprint, 1.0 mm height), JEDEC MO-178AA compliant, RoHS-compliant (+ suffix).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with TLV809E48DBZR and ADM6315-48ARTZ-R7, the MAX6394US480D3+T uniquely combines AEC-Q100 qualification, manual reset input with internal pullup, open-drain RESET for cross-rail coordination, and guaranteed 105 ms timeout-all in SOT143-4.

Availability

MAX6394US480D3+T is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, and portable medical devices requiring stable component supply with long-term lifecycle assurance and AEC-Q100 compliance.

Supply support for MAX6394US480D3+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 family delivers high-accuracy, low-power supervisory circuits for microprocessor reset generation-optimized for systems where voltage margin, temperature stability, and small footprint are critical.

FAQ

What is the exact reset threshold voltage and tolerance for MAX6394US480D3+T?

The MAX6394US480D3+T has a nominal reset threshold of 4.800 V with ±1.0% tolerance over the full operating temperature range of −40°C to +125°C. This is confirmed in Table 2 of the official datasheet, where suffix "480" corresponds to 4.752 V (min) to 4.848 V (max) at temperature extremes. The threshold is factory-laser-trimmed and requires no external calibration.

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

Yes, MAX6394US480D3+T includes a dedicated MR (manual reset) input on Pin 3. It is active-low, with an internal 63 kΩ pullup resistor-so it can be left floating if unused. A momentary switch to GND provides hardware reset without external debounce components. MR assertion overrides VCC monitoring and holds RESET low for the full 105 ms timeout after release.

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

Yes, the RESET output of MAX6394US480D3+T is an open-drain n-channel MOSFET rated for up to +6.0 V. It may be pulled up to any voltage between 0 V and +6.0 V-even if that voltage exceeds the VCC applied to Pin 4. This enables level-shifting for reset coordination across different supply domains, such as interfacing a 5 V supervisor with a 3.3 V microcontroller.

What is the guaranteed minimum reset timeout period for MAX6394US480D3+T?

The MAX6394US480D3+T uses the D3 timeout option, guaranteeing a minimum reset timeout period of 105 ms after VCC rises above the 4.800 V threshold or after MR is deasserted. Per Electrical Characteristics table, the typical value is 200 ms and maximum is 280 ms-but design-critical timing must use the 105 ms minimum specification.

Is MAX6394US480D3+T qualified for automotive applications?

Yes, the /V variant of this part (e.g., MAX6394US480D3/V+T) is explicitly AEC-Q100 qualified. While MAX6394US480D3+T itself carries the +T tape-and-reel suffix and shares identical die and SOT143-4 packaging, qualification applies to the /V version. For automotive production, specify the /V suffix to ensure certified test documentation and lot traceability.