Analog Devices Inc./Maxim Integrated MAX6394US455D3+T

Overview

MAX6394US455D3+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 when manual reset (MR) is asserted. It features ±0.6% threshold accuracy at +25°C, ±1.0% over –40°C to +125°C, 105ms minimum reset timeout, 5µA supply current, and operates from 1.0V to 5.5V. It is used in battery-powered controllers for reliable brownout detection.

For engineers reviewing the MAX6394US455D3+T datasheet, MAX6394US455D3+T pinout, MAX6394US455D3+T application, or MAX6394US455D3+T equivalent, key selection criteria include factory-trimmed 4.55V reset threshold, 105ms–280ms timeout range, SOT143-4 package compatibility, AEC-Q100 qualification status, and open-drain RESET output capable of level-shifting above VCC.

Technical Context

The MAX6394US455D3+T implements a precision voltage-monitoring comparator with laser-trimmed internal resistive divider to set its 4.55V nominal reset threshold. Its reset timeout is generated by an internal RC timer calibrated for 105ms (min), 200ms (typ), and 280ms (max) after VCC rises above threshold or MR deasserts.

It uses an open-drain n-channel MOSFET for RESET output, enabling pullup to any voltage ≤6V-including supplies independent of VCC-supporting level-shifted reset signaling. MR includes a 63kΩ internal pullup and 100ns glitch rejection, eliminating external debounce components.

Key Specifications

Pinout & Package

MAX6394US455D3+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 TLV803EB29DBZR and ADM6315-45D2ARTZ-RL, the MAX6394US455D3+T uniquely combines 4.55V precision threshold, 105ms+ timeout, MR input, open-drain level-shifting, and AEC-Q100 support-making it the only option for robust automotive or industrial reset supervision requiring guaranteed timing and noise immunity.

Availability

MAX6394US455D3+T is available at Aetrix Electronics and suitable for industrial controllers, battery-powered data loggers, and automotive body control modules requiring stable component supply, long-lifecycle availability, and traceable sourcing.

Supply support for MAX6394US455D3+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 high-performance analog and mixed-signal ICs for industrial, automotive, communications, and computing markets.

The MAX6394 series delivers high-accuracy, low-power microprocessor reset supervision with factory-trimmed thresholds and programmable timeouts-targeting applications demanding reliability under extreme temperature and transient conditions.

FAQ

What is the exact reset threshold voltage of the MAX6394US455D3+T?

The MAX6394US455D3+T has a factory-trimmed nominal reset threshold of 4.55V, with ±0.6% accuracy at +25°C (4.523V to 4.577V) and ±1.0% accuracy over –40°C to +125°C (4.505V to 4.596V). This value is laser-trimmed during production and does not require external calibration. The "455" suffix in MAX6394US455D3+T explicitly denotes the 4.55V threshold option.

Does the MAX6394US455D3+T support manual reset functionality?

Yes, the MAX6394US455D3+T includes a dedicated MR (manual reset) input on pin 3. A logic-low pulse ≥1µs on MR forces the RESET output active regardless of VCC level. RESET remains asserted for the full 105ms–280ms timeout period after MR returns high. An internal 63kΩ pullup resistor allows MR to be left floating if unused, and no external debounce circuitry is required.

Can the RESET output of the MAX6394US455D3+T be pulled up to a voltage higher than VCC?

Yes, the RESET output of the MAX6394US455D3+T is an open-drain n-channel MOSFET rated to 6.0V. It can be pulled up to any voltage between 0V and 6.0V-even higher than the VCC supply being monitored-enabling level-shifted reset signaling. For example, a 5V logic domain can be reset while monitoring a 3.3V VCC rail, without additional level translators.

What is the guaranteed reset timeout period for the MAX6394US455D3+T?

The MAX6394US455D3+T provides a minimum reset timeout period of 105ms, typical of 200ms, and maximum of 280ms after VCC rises above 4.55V or after MR is deasserted. This timeout is internally generated and factory-calibrated; no external capacitor is needed. The "D3" suffix in MAX6394US455D3+T identifies this specific 105ms–280ms timeout variant.

Is the MAX6394US455D3+T qualified for automotive applications?

The base MAX6394US455D3+T is specified for –40°C to +125°C operation and is AEC-Q100 qualified in its /V variant (e.g., MAX6394US455D3/V+T). While the +T suffix indicates tape-and-reel packaging, the /V suffix denotes automotive qualification. Customers requiring AEC-Q100 compliance should select the /V version; the MAX6394US455D3+T itself meets the temperature and reliability specs but requires verification of the specific /V ordering code for formal qualification documentation.