Analog Devices Inc./Maxim Integrated MAX6394US480D2+

Overview

MAX6394US480D2+ 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 falls below 4.800V or when manual reset (MR) is asserted. It features ±0.6% threshold accuracy at +25°C, ±1.0% 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 MAX6394US480D2+ datasheet, MAX6394US480D2+ pinout, MAX6394US480D2+ application, or MAX6394US480D2+ equivalent, key selection criteria include factory-trimmed 4.8V reset threshold, 14ms timeout, SOT143-4 package compatibility, open-drain output capable of pull-up above VCC, and AEC-Q100 qualification for automotive-grade reliability.

Technical Context

The MAX6394US480D2+ implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider to set the 4.800V nominal reset threshold, maintaining ±1.0% accuracy across -40°C to +125°C. Its internal timer generates a fixed 14ms (min) reset timeout after VCC recovery or MR deassertion.

It uses an open-drain n-channel MOSFET for RESET output, enabling level-shifting up to +6.0V independent of VCC, and includes a 63kΩ internal MR pullup resistor with 100ns glitch rejection - eliminating need for external debounce components in most applications.

Key Specifications

Pinout & Package

SOT143-4 (4-pin, 1.3mm × 2.9mm, 0.95mm height) surface-mount package with gull-wing leads and exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and ADM6315-48D2ARTZ-RL, the MAX6394US480D2+ uniquely combines 4.8V precision threshold, 14ms timeout, open-drain level-shifting, and integrated MR - making it optimal for automotive and industrial controllers requiring robust, flexible reset supervision.

Availability

MAX6394US480D2+ is available at Aetrix Electronics and suitable for industrial controllers, automotive body electronics, and portable medical instrumentation requiring stable component supply, long-term lifecycle support, and AEC-Q100–compliant variants.

Supply support for MAX6394US480D2+ 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, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.

The MAX6394 series delivers high-accuracy, low-power microprocessor supervisory circuits optimized for mission-critical power monitoring in harsh environments - targeting applications demanding ±1% threshold stability and guaranteed reset timing across extended temperature ranges.

FAQ

What is the exact reset threshold voltage of the MAX6394US480D2+?

The MAX6394US480D2+ has a factory-trimmed nominal reset threshold of 4.800V, with ±0.6% accuracy at +25°C and ±1.0% accuracy over the full -40°C to +125°C operating range. This value is laser-trimmed during production and verified per Tables 1 and 2 in the official datasheet. The "480" suffix explicitly denotes the 4.8V option, and the MAX6394US480D2+ maintains this specification without external calibration.

Does the MAX6394US480D2+ support manual reset functionality?

Yes, the MAX6394US480D2+ includes a dedicated MR (manual reset) input on Pin 3. A logic-low assertion on MR immediately forces the RESET output active, and RESET remains asserted for the full 14ms (minimum) timeout period after MR returns high. An internal 63kΩ pullup resistor eliminates the need for an external pullup unless noise immunity enhancements (e.g., 0.1µF capacitor to GND) are required in high-EMI environments.

Can the RESET output of the MAX6394US480D2+ be pulled up to a voltage higher than VCC?

Yes, the MAX6394US480D2+ features an open-drain RESET output rated to +6.0V, allowing it to be pulled up to any voltage between 0V and 6.0V - including voltages higher than the monitored VCC rail. This enables level-shifting applications, such as asserting a 5V reset signal while monitoring a 3.3V supply. The datasheet confirms RESET can safely interface with logic domains independent of VCC.

What is the guaranteed reset timeout period for the MAX6394US480D2+?

The MAX6394US480D2+ provides a guaranteed minimum reset timeout period of 14ms, with typical and maximum values of 28ms and 40ms respectively. This timeout begins when VCC rises above the 4.800V threshold or when MR is deasserted, and ensures the RESET signal remains active long enough to satisfy the reset pulse width requirements of most microcontrollers, including ARM Cortex-M and Renesas RL78 families.

Is the MAX6394US480D2+ suitable for automotive applications?

Yes, the MAX6394US480D2+ is offered in AEC-Q100 qualified versions (e.g., MAX6394US480D2/V+T), supporting operation from -40°C to +125°C with guaranteed parametric performance. Its ±1.0% threshold accuracy, immunity to short VCC transients, and robust SOT143 package make it appropriate for automotive body control modules, infotainment power sequencing, and ADAS sensor subsystems where reliable power-on reset is critical.