Analog Devices Inc./Maxim Integrated MAX6422XS26

Overview

MAX6422XS26 from Maxim Integrated is a low-power microprocessor supervisor IC that monitors VCC supply voltage and asserts an active-high push-pull RESET signal when voltage falls below 2.625V (±2.5% over temperature). It features capacitor-adjustable reset timeout (275µs base + 2.73s/F × CSRT), guaranteed operation down to VCC = 1V, and consumes only 1.6µA typical quiescent current. It is used in battery-powered controllers and portable equipment for reliable power-on reset and brownout protection.

For engineers reviewing the MAX6422XS26 datasheet, MAX6422XS26 pinout, MAX6422XS26 application, or MAX6422XS26 equivalent, key selection considerations include its active-high push-pull output, SC70-4 package, 2.625V factory-trimmed reset threshold, capacitor-set timeout delay, and immunity to short VCC transients - all critical for embedded µP reset integrity in space-constrained, low-power designs.

Technical Context

The MAX6422XS26 uses a precision internal 0.65V reference and 240nA ramp current source to charge an external capacitor (CSRT) on the SRT pin; reset deassertion occurs when the capacitor voltage reaches 0.65V. Its reset threshold is laser-trimmed to 2.625V with ±2.5% accuracy across –40°C to +125°C.

It operates over VCC = 1.0V to 5.5V, guarantees valid RESET output down to VCC = 1V, and exhibits hysteresis of 4×VTH (≈10.5mV). The device is immune to VCC transients ≤50µs when overdrive is 100mV below VTH, enabling robust operation in noisy power environments.

Key Specifications

Pinout & Package

MAX6422XS26 is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm, 0.5mm pitch), optimized for ultra-compact PCB layouts in portable and wearable systems.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6421XS26-T, MAX6422XS26 offers native active-high signaling for direct µP compatibility, while TLV809E26DBZR trades adjustability for lower cost and smaller footprint - making MAX6422XS26 optimal when precise, user-defined reset timing and push-pull drive strength are required.

Availability

MAX6422XS26 is available at Aetrix Electronics and suitable for battery-powered controllers, portable medical devices, and automotive body electronics requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.

Supply support for MAX6422XS26 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and computing applications.

The MAX6421–MAX6426 family was designed specifically for ultra-low-power, precision voltage monitoring in space-constrained embedded systems - delivering factory-trimmed thresholds, capacitor-adjustable timing, and guaranteed operation down to 1V.

FAQ

What is the exact reset threshold voltage of MAX6422XS26 and how stable is it over temperature?

The MAX6422XS26 has a factory-laser-trimmed reset threshold of 2.625V, with ±2.5% accuracy over the full operating range of –40°C to +125°C. This stability is achieved using on-chip trimmed resistors and a precision bandgap reference, ensuring consistent brownout detection across automotive and industrial thermal environments without external calibration.

How do I calculate the reset timeout period for MAX6422XS26 using the SRT capacitor?

For MAX6422XS26, use the formula tRP = (2.73 × 10⁶) × CSRT + 275µs, where tRP is in seconds and CSRT is in farads. For example, a 100nF capacitor yields tRP ≈ 273ms + 275µs ≈ 273.3ms. The SRT pin must be connected to ground via a low-leakage ceramic capacitor (≤10nA leakage) to ensure timing accuracy.

Can MAX6422XS26 operate reliably when VCC drops below 1.8V?

Yes - MAX6422XS26 is fully specified down to VCC = 1.0V and guarantees valid active-high RESET output behavior across this range. Its internal circuitry remains functional and the RESET output maintains proper logic levels (VOH ≥ 0.8×VCC, VOL ≤ 0.4V) even at 1.0V, enabling robust reset assertion during deep brownout conditions.

What package type and dimensions does MAX6422XS26 use, and is it RoHS-compliant?

MAX6422XS26 uses the SC70-4 package: 2.0mm × 2.1mm body size, 0.5mm lead pitch, and 0.9mm maximum height. It is available in both leaded and lead-free versions; specify "+T" suffix (e.g., MAX6422XS26+T) for RoHS-compliant, lead-free tape-and-reel packaging per JEDEC J-STD-020 moisture sensitivity level 1.

Why does MAX6422XS26 use an active-high push-pull RESET instead of open-drain?

MAX6422XS26 uses active-high push-pull RESET to directly drive µP reset inputs without requiring external pull-up resistors - reducing component count, PCB area, and potential noise coupling. This architecture ensures fast, strong logic transitions and eliminates ambiguity in reset state during power ramp-up, unlike open-drain variants that depend on external biasing.