Analog Devices Inc./Maxim Integrated MAX6468XS26D3

Overview

MAX6468XS26D3 from Maxim Integrated is a push-pull output microprocessor supervisory reset circuit monitoring +2.625V supply voltage with ±2.5% threshold accuracy over -40°C to +85°C, 150ms minimum reset timeout, and active-low RESET assertion valid down to VCC = +1V. It serves as a system-level power-on/brownout detector in automotive ECUs and industrial controllers requiring high immunity to voltage transients.

For engineers reviewing the MAX6468XS26D3 datasheet, MAX6468XS26D3 pinout, MAX6468XS26D3 application, or MAX6468XS26D3 equivalent, key selection criteria include its factory-trimmed 2.625V reset threshold, edge-triggered manual reset with 150ms one-shot pulse, push-pull output eliminating external pull-up, low 3µA supply current at 1.8V, and AEC-Q100–compatible automotive temperature range.

Technical Context

The MAX6468XS26D3 implements a precision bandgap-based voltage comparator with hysteresis to detect VCC drops below 2.625V (min 2.559V, max 2.691V), triggering an active-low RESET signal that remains asserted for ≥150ms after VCC recovers. Its internal MR debounce logic ignores falling edges within 150ms of MR rising, preventing false resets from switch bounce.

Unlike open-drain variants, the MAX6468XS26D3 uses a push-pull output stage capable of sourcing 500µA at VCC ≥ 2.5V (VOH ≥ 0.8×VCC) and sinking 1.2mA (VOL ≤ 0.3V), enabling direct interface with µP reset inputs without external components. The device operates continuously from VCC = +1.2V to +5.5V and guarantees RESET validity down to VCC = +1V.

Key Specifications

Pinout & Package

MAX6468XS26D3 is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm, 0.5mm pitch), 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 MAX6386US26D3 and TLV803EB26DBZR, the MAX6468XS26D3 uniquely combines factory-trimmed 2.625V detection, push-pull output, and edge-triggered MR in a space-optimized SC70-4 package - delivering lowest component count and highest noise immunity for automotive and industrial reset supervision.

Availability

MAX6468XS26D3 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLCs, medical infusion pumps, and smart energy meters requiring stable component supply under extended temperature and long lifecycle conditions.

Supply support for MAX6468XS26D3 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 with factory-trimmed thresholds and robust manual reset handling - engineered specifically for mission-critical embedded systems where power integrity is non-negotiable.

FAQ

What is the exact reset threshold voltage of MAX6468XS26D3 and how is it specified across temperature?

The MAX6468XS26D3 has a nominal reset threshold of 2.625V, with min/max values of 2.559V and 2.691V respectively at -40°C to +85°C, and ±3% total accuracy over the full -40°C to +125°C automotive range. This threshold is factory-trimmed and does not require external calibration. The MAX6468XS26D3 achieves this precision using laser-trimmed resistive networks within its BiCMOS process, ensuring stability without drift compensation circuitry.

Does MAX6468XS26D3 support manual reset functionality, and how does its edge-triggered input behave?

Yes, MAX6468XS26D3 features an edge-triggered manual reset (MR) input that responds only to falling edges, generating a fixed 150ms one-shot RESET pulse regardless of MR signal duration. After MR rises, the device enforces a 150ms debounce period during which subsequent falling edges are ignored - preventing false triggers from mechanical switch bounce. The MR pin includes an internal 1.5kΩ pull-up to VCC, allowing it to be left unconnected if unused. This behavior is confirmed in the device's timing diagram and electrical characteristics table.

What is the RESET output structure of MAX6468XS26D3, and why does it matter for system design?

The MAX6468XS26D3 uses an active-low push-pull RESET output, meaning it actively drives both high and low states without requiring an external pull-up resistor. This differs from open-drain variants like the MAX6467 series. The push-pull structure allows direct interfacing with µP reset pins while reducing BOM count, improving noise immunity, and enabling faster rise times. At VCC ≥ 2.5V, it sources 500µA with VOH ≥ 0.8×VCC and sinks 1.2mA with VOL ≤ 0.3V - specifications fully validated in the MAX6468XS26D3 datasheet's Electrical Characteristics table.

How low can VCC go while MAX6468XS26D3 still guarantees valid RESET assertion?

The MAX6468XS26D3 guarantees valid RESET output operation down to VCC = +1V - meaning RESET remains a well-defined logic-low signal even as the supply collapses. This is critical for fail-safe behavior during deep brownout events where other supervisors may release reset prematurely. The device continues asserting RESET until VCC falls below +1V, and resumes normal monitoring once VCC rises above the 2.625V threshold. This specification is explicitly guaranteed in the Absolute Maximum Ratings and Electrical Characteristics sections of the MAX6468XS26D3 datasheet.

What package type and footprint does MAX6468XS26D3 use, and is it RoHS-compliant?

MAX6468XS26D3 is supplied in a 4-pin SC70-4 package (2.0mm × 2.1mm, 0.5mm pitch), with top mark "AGS". It is available in both leaded and lead-free versions; the standard ordering suffix "-T" denotes lead-free packaging (replacing "T" with "+T" specifies lead-free). The SC70-4 footprint is documented in Maxim's package outline 21-0098 and is compatible with standard reflow profiles. Thermal performance is characterized at 3.1mW/°C derating above +70°C, supporting operation up to +125°C ambient.