Analog Devices Inc./Maxim Integrated MAX6467US29D3

Overview

The MAX6467US29D3 from Maxim Integrated is a microprocessor supervisory reset circuit in SOT143-4 package, monitoring +2.925V supply with ±2.5% threshold accuracy over -40°C to +125°C, asserting active-low open-drain RESET for ≥150ms after VCC drop or MR edge trigger, and consuming only 3µA at +1.8V - used in automotive infotainment power sequencing.

For engineers reviewing the MAX6467US29D3 datasheet, MAX6467US29D3 pinout, MAX6467US29D3 application, or MAX6467US29D3 equivalent, key selection factors include factory-trimmed 2.925V threshold, 150ms min reset timeout, open-drain output requiring external pullup, immunity to <100ns MR glitches, and operation down to VCC = +1V.

Technical Context

This device 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 stable 2.925V threshold across temperature with ±2.5% tolerance from -40°C to +85°C and ±3% up to +125°C.

The open-drain RESET output sinks ≥1.2mA at VCC ≥ +2.5V while maintaining VOL ≤ 0.3V, and remains valid as long as VCC stays above +1V. Supply current is specified at 3µA (typ) at +1.8V and increases to 7.5µA (max) across full operating voltage range.

Key Specifications

Pinout & Package

MAX6467US29D3 uses the 4-pin SOT143-4 surface-mount package (3.0mm × 1.6mm × 1.1mm), optimized for space-constrained automotive and portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6315US29D3 and TLV803EB29DBZR, the MAX6467US29D3 uniquely combines factory-trimmed 2.925V sensing, edge-triggered MR, open-drain output, and 150ms one-shot timing in a single SOT143-4 package - making it the only drop-in solution for automotive and industrial systems requiring robust manual reset capability without added components.

Availability

MAX6467US29D3 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O cards, and medical patient monitor battery backup systems requiring stable component supply with AEC-Q100 alignment and extended temperature support.

Supply support for MAX6467US29D3 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 and mixed-signal ICs for demanding industrial, automotive, and communications applications.

The MAX6467/MAX6468 product line delivers highly accurate, low-power supervisory circuits specifically engineered for reliable reset generation in harsh-temperature environments where power integrity is critical.

FAQ

What is the exact reset threshold voltage for MAX6467US29D3?

The MAX6467US29D3 has a factory-trimmed reset threshold of +2.925V, with a minimum of +2.852V and maximum of +2.998V over the -40°C to +85°C temperature range. At +125°C, the tolerance widens to ±3%, maintaining functional reliability in under-hood automotive applications. This precise value is laser-trimmed during production and does not require external calibration.

Does MAX6467US29D3 support manual reset with a standard pushbutton switch?

Yes, MAX6467US29D3 supports direct connection to a normally open momentary pushbutton between MR and GND. Its internal 1.5kΩ pullup resistor eliminates external components, and the edge-triggered one-shot architecture ensures a clean 150ms RESET pulse regardless of switch bounce duration. No external debounce circuitry is required, simplifying design and improving long-term reliability.

What is the minimum supply voltage at which MAX6467US29D3 guarantees valid RESET output?

MAX6467US29D3 guarantees valid RESET output down to VCC = +1V. Below this voltage, the internal circuitry may not sustain proper logic levels or timing accuracy. This feature ensures reliable reset assertion during deep brownout events common in automotive and battery-powered systems, allowing controlled shutdown before complete power loss.

Can MAX6467US29D3 be used with a 3.3V microcontroller reset input?

Yes, MAX6467US29D3 can interface with a 3.3V microcontroller reset input using an external pullup resistor (typically 4.7kΩ–10kΩ) from RESET to the 3.3V rail. As an open-drain output, it sinks current when asserted and releases the line when inactive, making it compatible with mixed-voltage systems and enabling wired-OR configurations with other reset sources.

What is the MR input's glitch rejection capability for MAX6467US29D3?

MAX6467US29D3 rejects MR input glitches as short as 100ns, preventing false resets caused by ESD, crosstalk, or noisy PCB traces. This specification is tested and guaranteed across the full -40°C to +125°C temperature range and applies to both rising and falling edges. The internal digital filter ensures only sustained low-level assertions longer than 100ns trigger the one-shot timer.