Analog Devices Inc./Maxim Integrated MAX6467US31D3

Overview

MAX6467US31D3 from Maxim Integrated is a microprocessor supervisory reset circuit in SOT143-4 package, monitoring +3.0V supply with factory-trimmed 3.075V reset threshold (min), asserting active-low open-drain RESET for ≥150ms after VCC drop or MR edge trigger, and operating across -40°C to +125°C for automotive-grade embedded control systems.

For engineers reviewing the MAX6467US31D3 datasheet, MAX6467US31D3 pinout, MAX6467US31D3 application, or MAX6467US31D3 equivalent, key selection criteria include its 3.075V threshold tolerance, 150ms reset timeout, open-drain output requiring external pullup, immunity to <100ns MR glitches, and guaranteed RESET validity down to VCC = +1V.

Technical Context

The MAX6467US31D3 implements an edge-triggered, one-shot manual reset architecture with internal 1.5kΩ MR pullup and 150ms debounce period, ensuring single-pulse assertion regardless of switch bounce duration. Its precision bandgap reference enables ±1.5% threshold accuracy at +25°C and ±2.5% over -40°C to +85°C.

VCC monitoring uses a comparator with 35µs propagation delay and built-in hysteresis; RESET remains asserted for ≥150ms after VCC recovers above threshold, and the open-drain output sinks up to 1.2mA at VCC ≥ +2.5V while consuming only 3µA at +1.8V.

Key Specifications

Pinout & Package

MAX6467US31D3 is housed in a 4-pin SOT143-4 package (2.9mm × 1.3mm × 1.0mm), optimized for space-constrained automotive and portable applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6467US31D3, MAX6315US31D3 offers lower unit cost but sacrifices automotive temp rating and 5× higher supply current, while TLV809E31DBZR saves board area with SOT23-3 but forces redesign of MR interface and removes one-shot timing control.

Availability

MAX6467US31D3 is available at Aetrix Electronics and suitable for automotive body electronics, portable medical devices, industrial PLC modules, and GPS telematics units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6467US31D3 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 demanding industrial, automotive, and communications applications.

The MAX6467/MAX6468 product line delivers precision, low-power microprocessor supervisors with edge-triggered manual reset for mission-critical embedded systems where reliability under voltage stress and thermal extremes is non-negotiable.

FAQ

What is the exact reset threshold voltage range for MAX6467US31D3?

The MAX6467US31D3 has a factory-trimmed reset threshold of 3.075V (minimum), 3.152V (typical), and 3.229V (maximum) over the -40°C to +85°C range, with ±3% tolerance extended to +125°C. This precise window targets +3.0V supply rails with tight regulation requirements, and the threshold is set at wafer level-no external components are needed to achieve this accuracy. The MAX6467US31D3 maintains this specification across its full automotive temperature range without drift compensation circuitry.

Does MAX6467US31D3 support manual reset functionality, and how does it work?

Yes, MAX6467US31D3 features an edge-triggered manual reset (MR) input that responds only to the first falling edge, asserting RESET for a fixed 150–300ms one-shot pulse. It includes internal 1.5kΩ pullup to VCC, eliminating external resistors, and rejects MR glitches ≤100ns. After MR rises, a 150ms debounce period prevents retriggering-ensuring clean, bounce-free reset initiation. This behavior is intrinsic to the MAX6467US31D3 design and verified across -40°C to +125°C.

What output type does MAX6467US31D3 use, and what are the drive requirements?

MAX6467US31D3 uses an active-low open-drain RESET output, requiring an external pullup resistor (typically 10–100kΩ) to a logic rail or VCC. It sinks up to 1.2mA at VCC ≥ +2.5V and 80µA at VCC ≥ +1V, with VOL ≤ 0.3V under those conditions. Unlike push-pull variants (e.g., MAX6468), the MAX6467US31D3 cannot source current-enabling wired-OR configurations with other reset sources but mandating proper pullup sizing to avoid excessive power draw or slow rise times.

Can MAX6467US31D3 operate reliably during deep brownout conditions?

Yes, MAX6467US31D3 guarantees functional operation and valid RESET signaling down to VCC = +1.2V, with RESET remaining asserted and electrically valid as low as VCC = +1V. This enables robust fail-safe behavior in systems experiencing gradual power collapse, such as battery-powered devices discharging below nominal voltage. The MAX6467US31D3's 3µA supply current at +1.8V further extends usable runtime in these scenarios-critical for portable medical and automotive applications.

Is MAX6467US31D3 pin-compatible with other Maxim supervisors?

Yes, MAX6467US31D3 is pin-compatible with MAX811, MAX6315, MAX6384, and MAX6386 in the same SOT143-4 package, sharing identical 4-pin layout (VCC, GND, RESET, MR). However, electrical differences exist: MAX6467US31D3 offers tighter threshold tolerance (±2.5%), lower ICC (3µA vs. 8–15µA), and enhanced MR debounce versus older parts. System-level validation is required before drop-in replacement, especially for timing-critical µP boot sequences relying on specific timeout durations.