Analog Devices Inc./Maxim Integrated MAX6467US44D3+T

Overview

The MAX6467US44D3+T from Analog Devices is a microprocessor supervisory reset circuit in SOT143-4 package, monitoring +4.375V supply voltage with ±1.5% threshold accuracy at +25°C, 150ms minimum reset timeout, and active-low open-drain RESET output. It asserts reset during power-up, brownout, or manual reset events in automotive-grade embedded systems.

For engineers reviewing the MAX6467US44D3+T datasheet, MAX6467US44D3+T pinout, MAX6467US44D3+T application, or MAX6467US44D3+T equivalent, key selection criteria include factory-trimmed 4.375V threshold, edge-triggered one-shot MR input, -40°C to +125°C operation, and compatibility with +1.8V to +5.0V supply rails.

Technical Context

This device implements a precision bandgap-based voltage reference for VCC threshold detection and integrates an edge-sensitive monostable circuit for MR input debouncing and one-shot reset generation. Its internal 1.5kΩ MR pullup resistor eliminates external components for manual reset implementation.

The open-drain RESET output requires an external pullup and remains valid down to VCC = +1V, while immunity to transients ≤100ns ensures robust operation in noisy automotive environments. Reset assertion timing is defined by fixed 150ms timeout after VCC recovery or MR falling edge.

Key Specifications

Pinout & Package

MAX6467US44D3+T uses the 4-pin SOT143-4 surface-mount package (3.0mm × 1.7mm × 1.3mm), optimized for space-constrained automotive and portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6467US44D3+T, MAX6384US44D3+T offers push-pull drive but loses wired-OR flexibility, while TLV809E43DBZR omits MR and automotive qualification-making MAX6467US44D3+T the sole choice for AEC-Q100-compliant edge-triggered reset in space-constrained layouts.

Availability

MAX6467US44D3+T is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O modules, and medical infusion pump controllers requiring stable component supply across extended temperature ranges.

Supply support for MAX6467US44D3+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

Analog Devices is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies.

The MAX6467 series belongs to Analog Devices' precision supervisory IC product line, designed specifically for automotive and industrial applications demanding AEC-Q100 qualification, wide temperature operation, and factory-trimmed voltage thresholds.

FAQ

What is the exact reset threshold voltage of MAX6467US44D3+T and how is it trimmed?

The MAX6467US44D3+T has a factory-trimmed nominal reset threshold of 4.375V, with ±1.5% initial accuracy at +25°C and ±2.5% over -40°C to +85°C. This value is laser-trimmed during wafer sort and verified per device, eliminating need for external resistor dividers. The '44' suffix in MAX6467US44D3+T directly encodes this 4.375V threshold per the manufacturer's ordering guide.

Does MAX6467US44D3+T support manual reset functionality and how does its edge-triggering work?

Yes, MAX6467US44D3+T features an edge-triggered manual reset (MR) input that responds only to the first falling edge, generating a fixed 150ms one-shot reset pulse. Internal timing circuitry ignores subsequent MR edges for 150ms after MR rises, preventing false triggers from switch bounce. The MR pin includes a 1.5kΩ internal pullup resistor to VCC, enabling direct connection to a momentary switch without external components.

What is the minimum supply voltage at which MAX6467US44D3+T guarantees valid RESET output behavior?

MAX6467US44D3+T guarantees valid RESET output down to VCC = +1.0V. Below this voltage, the internal circuitry cannot maintain specified timing or logic levels. This feature ensures deterministic reset assertion during deep brownout conditions common in automotive stop-start systems, where battery voltage may sag to 1.0V before complete collapse.

Is MAX6467US44D3+T qualified for automotive applications and what standards does it meet?

Yes, MAX6467US44D3+T is AEC-Q100 qualified for automotive applications, rated for operation from -40°C to +125°C. It meets stress test requirements for temperature cycling, humidity bias, and mechanical shock per AEC-Q100 Rev G. The '+T' suffix confirms RoHS-compliant lead-free packaging, and the '/V' variant designation (not present in this part number) indicates full automotive qualification-though MAX6467US44D3+T itself is manufactured to the same automotive process and testing standards.

How does the open-drain RESET output of MAX6467US44D3+T differ from push-pull alternatives and when should it be used?

The open-drain RESET output of MAX6467US44D3+T requires an external pullup resistor and enables wired-OR connection of multiple reset sources onto a shared reset bus. This is essential in systems with redundant supervisors or multi-processor architectures. Unlike push-pull outputs (e.g., MAX6468), it avoids contention when multiple devices drive the same line, making MAX6467US44D3+T the preferred choice for complex reset tree topologies.