Analog Devices Inc./Maxim Integrated MAX6467US22D3+

Overview

MAX6467US22D3+ from Maxim Integrated is a microprocessor supervisory reset circuit in SOT143-4 package, monitoring +2.188V supply (typical threshold) with 150ms minimum reset timeout, active-low open-drain RESET output, and edge-triggered manual reset input. It ensures reliable µP reset during power-up, brownout, or manual intervention in automotive and industrial embedded systems.

For engineers reviewing the MAX6467US22D3+ datasheet, MAX6467US22D3+ pinout, MAX6467US22D3+ application, or MAX6467US22D3+ equivalent, key selection criteria include factory-trimmed 2.188V threshold accuracy (±2.5% over -40°C to +85°C), VCC operation down to +1.2V, 3µA supply current at 1.8V, immunity to <100ns MR glitches, and guaranteed RESET validity down to VCC = +1V.

Technical Context

The MAX6467US22D3+ implements a precision bandgap-based voltage monitor with hysteresis-free threshold detection and an internal one-shot timer for both VCC-initiated and MR-initiated reset assertion. Its edge-triggered MR input ignores subsequent falling edges within the 150ms debounce window after MR rises, eliminating switch bounce artifacts.

RESET assertion is synchronized to VCC crossing the 2.188V threshold (min 2.133V, max 2.242V) with 35µs typical propagation delay, and remains asserted for ≥150ms after VCC recovery or MR edge-ensuring sufficient µP initialization time across automotive temperature range (-40°C to +125°C).

Key Specifications

Pinout & Package

MAX6467US22D3+ uses the 4-pin SOT143-4 surface-mount package (3.0mm × 1.5mm × 1.3mm), optimized for space-constrained PCB layouts in portable and automotive modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6315US22D3+, MAX6467US22D3+ adds robust MR debounce and cuts supply current by 62%, enabling longer battery runtime; versus TPS3808G18DBVR, it trades 0.013V threshold offset and +20°C extended range for 2.1× higher ICC-critical for automotive thermal margin and functional safety compliance.

Availability

MAX6467US22D3+ is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O subsystems, and medical infusion pump controllers requiring stable component supply with guaranteed long-term availability and AEC-Q100-aligned qualification.

Supply support for MAX6467US22D3+ 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 supervisory circuits with factory-trimmed thresholds and edge-triggered manual reset-targeting reliability-critical embedded systems where deterministic reset behavior is non-negotiable.

FAQ

What is the exact reset threshold voltage of the MAX6467US22D3+ and how does it vary with temperature?

The MAX6467US22D3+ has a nominal reset threshold of 2.188V, with min/max values of 2.133V and 2.242V over -40°C to +85°C (±2.5%). From +85°C to +125°C, tolerance widens to ±3%. This threshold is factory-trimmed and laser-adjusted-no external components are needed to achieve this accuracy. The MAX6467US22D3+ maintains monotonic behavior across its full operating range, with typical normalized threshold drift of ±0.5% from -40°C to +125°C per the toc05 graph.

Does the MAX6467US22D3+ require an external pullup resistor on the RESET pin, and what value is recommended?

Yes, the MAX6467US22D3+ features an active-low open-drain RESET output and requires an external pullup resistor. A value between 10kΩ and 100kΩ is recommended, with 47kΩ commonly used to balance rise time (<1µs with 10pF load) and current consumption (<0.1mA at 5V). The pullup must connect to the same voltage domain as the µP reset pin (e.g., 3.3V or 2.5V), not necessarily VCC. The MAX6467US22D3+ can sink up to 80µA while asserting RESET low, ensuring compatibility with standard CMOS reset inputs.

How does the manual reset (MR) function work on the MAX6467US22D3+, and what happens if the MR button is held low continuously?

The MR input on the MAX6467US22D3+ is edge-triggered: only the first falling edge initiates a one-shot 150ms RESET pulse. If the MR button is held low continuously, no additional resets occur-the internal debounce timer (tDEB = 150ms) prevents retriggering until MR rises and stays high for ≥150ms. This eliminates false resets from switch chatter. The MAX6467US22D3+ includes a 1.5kΩ internal pullup to VCC, so MR may be left unconnected if unused-no external resistor required.

Can the MAX6467US22D3+ operate reliably when the VCC supply drops below 1.8V, and what is the lowest valid VCC for RESET assertion?

Yes, the MAX6467US22D3+ operates down to VCC = +1.2V (min spec) and guarantees valid RESET assertion and deassertion as low as VCC = +1.0V. Below +1.0V, RESET behavior is undefined. At VCC = +1.2V, supply current is ~4µA and reset delay remains within spec (35µs). This capability allows the MAX6467US22D3+ to provide clean reset signaling during deep brownout events common in automotive stop-start systems, where battery voltage may dip to 6V causing 2.5V LDO output to collapse near 1.2V.

Is the MAX6467US22D3+ pin-compatible with other Maxim supervisory circuits, and which ones?

Yes, the MAX6467US22D3+ is pin-compatible with MAX811, MAX6315, MAX6384, and MAX6386 in the same SOT143-4 package. All share identical 4-pin layout (VCC, GND, RESET, MR) and compatible voltage ranges. However, functional differences exist: MAX811 lacks MR debounce and has fixed 140ms timeout; MAX6315 has no MR input; MAX6384/6386 offer different threshold options. Direct replacement is possible only when matching threshold, timeout, and MR functionality-always verify electrical compatibility using the MAX6467US22D3+ datasheet's comparison tables.