Analog Devices Inc./Maxim Integrated MAX6468US46D3+T

Overview

MAX6468US46D3+T from Analog Devices is a push-pull output microprocessor supervisory circuit that monitors +4.625V supply voltage with ±1.5% threshold accuracy at +25°C, asserts active-low RESET on VCC drop or edge-triggered MR input, and provides 150ms minimum reset timeout - used in automotive engine control units to ensure deterministic µP reset during cold-crank brownout events.

For engineers reviewing the MAX6468US46D3+T datasheet, MAX6468US46D3+T pinout, MAX6468US46D3+T application, or MAX6468US46D3+T equivalent, key selection criteria include factory-trimmed 4.625V threshold, push-pull RESET output compatibility with 3.3V/5V logic families, -40°C to +125°C automotive qualification, and SOT143-4 package footprint constraints.

Technical Context

The MAX6468US46D3+T implements a precision bandgap-based voltage reference with temperature-compensated comparator to detect VCC falling below 4.625V (min 4.509V, max 4.741V). Its internal one-shot timer triggers fixed 150ms–300ms RESET assertion on MR falling edge, independent of MR pulse width.

Reset assertion is immune to transients ≤100ns glitch duration and supports valid RESET down to VCC = +1V. The push-pull output drives high to 0.8×VCC at 500µA source current, eliminating external pull-up resistors required by open-drain variants like MAX6467.

Key Specifications

Pinout & Package

MAX6468US46D3+T uses a 4-pin SOT143-4 surface-mount package (2.9mm × 1.6mm × 1.1mm) with gull-wing leads, optimized for high-density automotive PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6468US46D7+T and TLV809E46DBZR, the MAX6468US46D3+T uniquely balances automotive-grade reliability, push-pull output convenience, and 150ms reset timing optimized for modern microcontrollers - avoiding over-engineered timeout margins while eliminating external components.

Availability

MAX6468US46D3+T is available at Aetrix Electronics and suitable for automotive engine control, ADAS sensor fusion, and telematics applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6468US46D3+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 leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.

The MAX6467/MAX6468 product line delivers automotive-qualified power-supply monitoring with factory-trimmed thresholds and edge-triggered manual reset - designed specifically for deterministic reset behavior in safety-critical vehicle subsystems.

FAQ

What is the exact reset threshold voltage of MAX6468US46D3+T and how does it vary with temperature?

The MAX6468US46D3+T has a factory-trimmed reset threshold of 4.625V typical, with min/max of 4.509V/4.741V at +25°C. Over -40°C to +85°C, threshold variation is ±2.5%; from +85°C to +125°C, it widens to ±3%. This is specified in the Electrical Characteristics table and confirmed in the Normalized Reset Threshold vs. Temperature plot (Figure toc05).

Does MAX6468US46D3+T require an external pull-up resistor on the RESET pin?

No, MAX6468US46D3+T does not require an external pull-up resistor because it features a push-pull RESET output. Unlike the open-drain MAX6467 variant, the MAX6468US46D3+T actively drives high to 0.8×VCC at 500µA, enabling direct connection to microprocessor RESET inputs without additional components.

What is the function of the MR pin on MAX6468US46D3+T and how should it be interfaced?

The MR pin on MAX6468US46D3+T is an edge-triggered manual reset input. A falling edge initiates a fixed 150ms–300ms one-shot RESET pulse. It includes a 1.5kΩ internal pull-up to VCC, so a normally open momentary switch from MR to GND suffices - no external pull-up or debounce circuitry is needed.

Is MAX6468US46D3+T qualified for automotive applications and what standards does it meet?

Yes, MAX6468US46D3+T is AEC-Q100 qualified for automotive use and specified over -40°C to +125°C. The "/V" suffix denotes automotive qualification, and the +T indicates RoHS-compliant lead-free packaging - both confirmed in the Ordering Information table and Package Information section.

How does the reset timeout period of MAX6468US46D3+T compare to the MR timeout period?

For MAX6468US46D3+T, both the VCC reset timeout period and MR timeout period are identical: 150ms minimum, 225ms typical, and 300ms maximum. This ensures consistent reset duration whether triggered by supply brownout or manual reset, simplifying system-level timing analysis and validation.