Analog Devices Inc./Maxim Integrated MAX6394US455D2+T

Overview

MAX6394US455D2+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 4.55V or upon manual reset assertion. It features ±1.0% threshold accuracy over –40°C to +125°C, 14ms minimum reset timeout, 5µA supply current, and SOT143-4 package - used in battery-powered controllers and critical μP power monitoring.

For engineers reviewing the MAX6394US455D2+T datasheet, MAX6394US455D2+T pinout, MAX6394US455D2+T application, or MAX6394US455D2+T equivalent, key selection criteria include factory-trimmed 4.55V reset threshold, 14ms timeout, open-drain output compatible with voltages up to 6V, AEC-Q100 qualification, and immunity to short VCC transients.

Technical Context

The MAX6394US455D2+T implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider to set its 4.55V reset threshold, maintaining ±1.0% accuracy across –40°C to +125°C. Its internal timer enforces a guaranteed minimum 14ms reset timeout after VCC recovery or MR deassertion.

It uses an open-drain n-channel MOSFET for RESET output, enabling level-shifting - the output can be pulled up to any voltage ≤6V, independent of VCC. The MR input includes a 63kΩ internal pullup and supports debounced manual reset without external components.

Key Specifications

Pinout & Package

SOT143-4 (4-pin, 1.3mm × 2.9mm, 0.95mm height), surface-mount package with exposed pad not electrically connected. Pin 1 = GND, Pin 2 = RESET, Pin 3 = MR, Pin 4 = VCC (top view).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G33DBVR and ADM6315-45ARJZ-RL7, the MAX6394US455D2+T uniquely delivers 4.55V precision threshold with ±1.0% tempco, 14ms timeout optimized for fast-boot MCUs, integrated MR debounce, and AEC-Q100 Grade 0 compliance - making it optimal for automotive and high-reliability portable designs.

Availability

MAX6394US455D2+T is available at Aetrix Electronics and suitable for battery-powered controllers, critical μP power monitoring, and intelligent instruments requiring stable component supply and long-term lifecycle support.

Supply support for MAX6394US455D2+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 MAX6394 family delivers high-accuracy, low-power microprocessor supervisory circuits with factory-trimmed thresholds and multiple timeout options - engineered for reliable power-up, brownout, and manual reset control in harsh environments.

FAQ

What is the exact reset threshold voltage of the MAX6394US455D2+T?

The MAX6394US455D2+T has a factory-trimmed nominal reset threshold of 4.55V, with guaranteed accuracy of ±1.0% over the full operating temperature range of –40°C to +125°C. This value is laser-trimmed during manufacturing and does not require external calibration. The actual threshold for a given unit falls between 4.505V and 4.596V at temperature extremes, as confirmed in Table 2 of the official datasheet.

Does the MAX6394US455D2+T support manual reset functionality?

Yes, the MAX6394US455D2+T includes a dedicated MR (manual reset) input on Pin 3. A logic-low pulse ≥1µs on MR immediately asserts the RESET output, which remains active for the full 14ms timeout period after MR returns high. The pin features an internal 63kΩ pullup resistor, allowing it to be left unconnected if manual reset is not needed - eliminating external components for basic operation.

Can the RESET output of the MAX6394US455D2+T be pulled up to a voltage higher than VCC?

Yes, the MAX6394US455D2+T features an open-drain RESET output rated for voltages up to +6.0V, regardless of VCC level. This allows the RESET signal to interface directly with higher-voltage logic domains (e.g., pulling up to 5V while VCC = 3.3V), enabling level shifting without external translators. The output can sink up to 3.2mA when VCC > 4.25V, per the Electrical Characteristics table.

Is the MAX6394US455D2+T qualified for automotive applications?

Yes, the MAX6394US455D2+T is AEC-Q100 qualified (Grade 0: –40°C to +125°C ambient), as explicitly stated in the Benefits and Features section and Ordering Information. This qualification covers stress testing for temperature cycling, humidity, ESD, and other automotive reliability requirements - confirming suitability for body control modules, infotainment power sequencing, and other under-hood or cabin applications.

What is the supply current consumption of the MAX6394US455D2+T at room temperature?

The MAX6394US455D2+T draws only 5µA typical supply current (ICC) at +25°C with VCC = 5.5V and no load, as specified in the Electrical Characteristics table. At lower VCC levels (e.g., 3.6V), ICC drops to 4µA typical. This ultra-low quiescent current makes the MAX6394US455D2+T ideal for battery-backed systems where standby power budget is constrained.