Analog Devices Inc./Maxim Integrated MAX6467XS22D3-T

Overview

MAX6467XS22D3-T from Maxim Integrated is a microprocessor supervisory reset circuit in SC70-4 package, featuring a factory-trimmed 2.188V reset threshold (±2.5% over -40°C to +85°C), 150ms minimum reset timeout, active-low open-drain RESET output, and edge-triggered manual reset input. It monitors single +1.8V to +5.0V supplies and ensures reliable µP reset during brownout, power-up, and manual intervention in automotive-grade systems.

For engineers reviewing the MAX6467XS22D3-T datasheet, MAX6467XS22D3-T pinout, MAX6467XS22D3-T application, or MAX6467XS22D3-T equivalent, key selection criteria include its 2.188V threshold accuracy, 150ms fixed timeout, VCC-down-to-1V operation, immunity to <100ns MR glitches, and compatibility with noise-sensitive portable and automotive embedded control designs.

Technical Context

The MAX6467XS22D3-T implements a precision bandgap-based voltage monitor with hysteresis and an internal one-shot timer for both VCC-fall and MR-edge events. Its reset assertion logic combines analog threshold detection with digital timing control, ensuring deterministic 150ms low pulse on RESET after either VCC drop below 2.188V or MR falling edge.

It uses BiCMOS process (748 transistors) to achieve ultra-low 3µA supply current at 1.8V and guarantees RESET validity down to VCC = +1V. The internal 1.5kΩ MR pullup eliminates external components, while open-drain RESET requires external pullup and supports wired-OR configurations.

Key Specifications

Pinout & Package

MAX6467XS22D3-T is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm × 0.9mm), optimized for space-constrained portable and automotive PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX811SUS22D3-T and TLV803EB22DBZR, the MAX6467XS22D3-T uniquely integrates edge-triggered MR with built-in debounce and open-drain flexibility-critical for robust field-deployed equipment using momentary switches and shared reset buses.

Availability

MAX6467XS22D3-T is available at Aetrix Electronics and suitable for automotive infotainment, portable medical sensors, industrial PLC I/O modules, GPS tracking devices, and battery-powered embedded control systems requiring stable component supply across extended temperature ranges.

Supply support for MAX6467XS22D3-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 demanding industrial, automotive, and communications applications.

The MAX6467/MAX6468 product line delivers precision, low-power supervisory circuits for microprocessor reset management in harsh environments-specifically engineered for automotive (-40°C to +125°C) and portable equipment where reliability and minimal quiescent current are critical.

FAQ

What is the exact reset threshold voltage of the MAX6467XS22D3-T and how does it vary with temperature?

The MAX6467XS22D3-T has a factory-trimmed typical reset threshold of 2.188V, with guaranteed tolerance of ±2.5% over -40°C to +85°C and ±3% over +85°C to +125°C. This threshold is referenced to an internal bandgap and exhibits less than 0.5% deviation across the full -40°C to +125°C operating range, as confirmed by normalized threshold vs. temperature plots in the datasheet. The MAX6467XS22D3-T maintains this accuracy without external calibration components.

Does the MAX6467XS22D3-T require an external pullup resistor on the RESET pin, and what value is recommended?

Yes, the MAX6467XS22D3-T features an active-low open-drain RESET output and requires an external pullup resistor. A value between 10kΩ and 100kΩ is recommended, depending on bus capacitance and rise-time requirements. For standard 3.3V systems with ≤50pF load, 47kΩ provides optimal noise immunity and rise time; the MAX6467XS22D3-T's VOL remains ≤0.3V with up to 80µA sink current, ensuring solid logic-low assertion.

How does the manual reset (MR) function work on the MAX6467XS22D3-T, and what happens if the MR button is held down continuously?

The MAX6467XS22D3-T implements an edge-triggered, one-shot MR input: only the first falling edge initiates a fixed 150ms RESET pulse, and subsequent edges within the 150ms debounce window are ignored. If the MR button is held down continuously, the MAX6467XS22D3-T asserts RESET once for exactly 150ms and then releases it-even while MR remains low-preventing indefinite reset assertion and enabling reliable recovery in field-deployed systems.

Can the MAX6467XS22D3-T operate reliably when the supply voltage drops below 1.8V, and what is the lower limit?

Yes, the MAX6467XS22D3-T is fully specified to operate down to VCC = +1.0V, and its RESET output remains valid (i.e., correctly asserted or deasserted) as long as VCC stays above +1.0V. Below +1.0V, the internal circuitry may become undefined, but the MAX6467XS22D3-T guarantees proper reset behavior through the critical brownout region where many µPs lose execution integrity-making it suitable for deep undervoltage monitoring in automotive and battery-fail scenarios.

Is the MAX6467XS22D3-T pin-compatible with other Maxim supervisory ICs, and which ones?

The MAX6467XS22D3-T is pin-compatible with the MAX811, MAX6315, MAX6384, and MAX6386 in the same SC70-4 package, sharing identical 4-pin VCC-GND-RESET-MR layout and function mapping. This allows direct replacement in existing designs without PCB modification, provided the reset threshold and timeout requirements align; the MAX6467XS22D3-T's 2.188V/150ms profile matches MAX811SUS22D3-T's electrical behavior while adding enhanced MR debounce and lower supply current.