Analog Devices Inc./Maxim Integrated MAX6394US480D1/V+T

Overview

MAX6394US480D1/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 VCC drops below 4.800V (±0.6% at +25°C) or when manual reset (MR) is asserted. It features a factory-programmed 0.7ms minimum reset timeout period, 5µA supply current at +25°C, and operates across -40°C to +125°C for automotive-grade power monitoring in critical μP systems.

For engineers reviewing the MAX6394US480D1/V+T datasheet, MAX6394US480D1/V+T pinout, MAX6394US480D1/V+T application, or MAX6394US480D1/V+T equivalent, key selection criteria include its ±1.0% threshold accuracy over full temperature range, immunity to short VCC transients, AEC-Q100 qualification, and compatibility with level-shifted reset signaling via open-drain output pulled up to voltages exceeding VCC.

Technical Context

The MAX6394US480D1/V+T implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider to set the 4.800V reset threshold, coupled with a temperature-stable monostable timer for fixed 0.7ms reset timeout. Its MR input includes internal 63kΩ pullup and 100ns glitch rejection, enabling direct switch connection without external debounce.

This device uses an open-drain n-channel MOSFET for RESET output, supporting voltage-level translation between monitored VCC (1.0V–5.5V) and higher-voltage reset domains (up to +6.0V), while maintaining guaranteed logic-low assertion down to VCC = 1.0V and <0.4V VOL at 3.2mA sink current.

Key Specifications

Pinout & Package

MAX6394US480D1/V+T is housed in a 4-pin SOT143-4 (also referenced as U4+1/U4+1A) surface-mount package, measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and 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 TLV803EB48DBZR and TPS3808G33DBVR, the MAX6394US480D1/V+T uniquely combines 4.800V precision threshold, 0.7ms timeout, MR input with internal pullup, and AEC-Q100 qualification-making it optimal for automotive and high-reliability 5V-system reset supervision where minimal timeout and manual recovery are required.

Availability

MAX6394US480D1/V+T is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and portable medical diagnostic equipment requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.

Supply support for MAX6394US480D1/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 automotive, industrial, communications, and computing markets.

The MAX6394 series delivers high-accuracy, low-power microprocessor reset supervision with factory-trimmed thresholds and fixed timeout periods-targeting applications demanding deterministic power-on reset behavior in harsh thermal and electrical environments.

FAQ

What is the exact reset threshold voltage of the MAX6394US480D1/V+T?

The MAX6394US480D1/V+T 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 temperature range. This value is laser-trimmed during manufacturing and specified in Tables 1 and 2 of the official datasheet.

Does the MAX6394US480D1/V+T support manual reset functionality?

Yes, the MAX6394US480D1/V+T includes a dedicated MR (manual reset) input on Pin 3. A logic-low assertion on MR forces RESET active regardless of VCC level, and RESET remains asserted for the full 0.7ms timeout after MR is released. MR features an internal 63kΩ pullup resistor, eliminating need for external components when unused.

Can the RESET output of the MAX6394US480D1/V+T be pulled up to a voltage higher than VCC?

Yes, the MAX6394US480D1/V+T features an open-drain RESET output rated to 6.0V, allowing it to be pulled up to any voltage between 0V and +6.0V-even above the monitored VCC rail. This enables level-shifting applications, such as using a 5V reset bus to supervise a 3.3V VCC domain.

Is the MAX6394US480D1/V+T qualified for automotive applications?

Yes, the MAX6394US480D1/V+T carries the /V suffix indicating AEC-Q100 qualification for automotive applications. It is rated for operation from -40°C to +125°C and meets stress testing requirements defined in the AEC-Q100 standard, making it suitable for under-hood and infotainment systems.

What is the supply current consumption of the MAX6394US480D1/V+T at room temperature?

The MAX6394US480D1/V+T draws only 5µA typical supply current at +25°C and VCC = 5.5V, with maximum consumption of 12µA under same conditions. At +125°C, ICC rises to ≤15µA, ensuring ultra-low power operation ideal for battery-powered and energy-sensitive systems.