Analog Devices Inc./Maxim Integrated MAX6394US470D3+T

Overview

MAX6394US470D3+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 4.70V or when manual reset (MR) is asserted. It features ±1.0% reset threshold accuracy over −40°C to +125°C, 105ms minimum reset timeout period, and 5µA typical supply current at +25°C. Used in battery-powered controllers and critical μP power monitoring.

For engineers reviewing the MAX6394US470D3+T datasheet, MAX6394US470D3+T pinout, MAX6394US470D3+T application, or MAX6394US470D3+T equivalent, key selection criteria include factory-trimmed 4.70V reset threshold, 105ms timeout tolerance, SOT143-4 package compatibility, and AEC-Q100 qualification for automotive-grade reliability.

Technical Context

The MAX6394US470D3+T implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider to set its 4.70V nominal reset threshold, maintaining ±1.0% accuracy across −40°C to +125°C. Its internal timer generates a guaranteed minimum 105ms reset pulse after VCC recovery or MR deassertion.

It uses an open-drain n-channel MOSFET output stage allowing RESET to be pulled up to voltages up to +6.0V - independent of VCC - enabling level-shifted reset signaling across mixed-supply systems. MR includes a 63kΩ internal pullup and 100ns glitch rejection.

Key Specifications

Pinout & Package

SOT143-4 (4-pin plastic surface-mount package, 1.3mm × 2.9mm footprint, 1.0mm height), JEDEC MO-178AA compliant, 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 TPS3808G33DBVR and ADM6315-47ARTZ-R7, the MAX6394US470D3+T uniquely combines 4.70V precision threshold, MR input, open-drain RESET with >VCC capability, and AEC-Q100 qualification - making it optimal for automotive and industrial systems demanding robust, flexible reset control.

Availability

MAX6394US470D3+T is available at Aetrix Electronics and suitable for industrial controllers, automotive body control modules, and portable medical sensors requiring stable component supply, long-term lifecycle support, and AEC-Q100–compliant reliability.

Supply support for MAX6394US470D3+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 industrial, automotive, communications, and computing applications.

The MAX6394US470D3+T belongs to Maxim's high-accuracy μP supervisory product line, engineered specifically for reliable power-on reset, brownout protection, and manual reset coordination in harsh-temperature embedded systems.

FAQ

What is the exact reset threshold voltage of the MAX6394US470D3+T?

The MAX6394US470D3+T has a factory-trimmed nominal reset threshold of 4.70V, with guaranteed accuracy of ±1.0% over the full −40°C to +125°C operating temperature range. At +25°C, the threshold is tighter at ±0.6%, i.e., 4.672V to 4.728V. This value is laser-trimmed during manufacturing and does not require external calibration.

Does the MAX6394US470D3+T support manual reset functionality?

Yes, the MAX6394US470D3+T includes a dedicated Manual Reset (MR) input (Pin 3). A logic-low signal on MR immediately asserts the RESET output, which remains active for the full 105ms timeout period after MR returns high. MR features an internal 63kΩ pullup resistor, so it may be left floating if unused - no external components required.

Can the RESET output of the MAX6394US470D3+T be pulled up to a voltage higher than VCC?

Yes, the MAX6394US470D3+T features an open-drain RESET output rated for voltages up to +6.0V. This allows the RESET signal to be pulled up to a higher-voltage rail (e.g., 5.0V) while monitoring a lower VCC (e.g., 3.3V), enabling level-shifted reset signaling across mixed-supply systems without additional logic.

What is the minimum reset timeout period specified for the MAX6394US470D3+T?

The MAX6394US470D3+T is configured with the D3 timeout option, specifying a minimum reset timeout period of 105ms. Typical and maximum values are 200ms and 280ms respectively. This interval begins when VCC rises above 4.70V or when MR is deasserted, and ensures sufficient time for microprocessor initialization before release.

Is the MAX6394US470D3+T qualified for automotive applications?

Yes - the MAX6394US470D3+T is AEC-Q100 qualified for Grade 1 (−40°C to +125°C), as confirmed in the official datasheet. This qualification covers stress testing for temperature cycling, humidity, mechanical shock, and ESD, making it suitable for under-hood and body-control module applications where reliability under thermal and electrical stress is mandatory.