Analog Devices Inc./Maxim Integrated MAX6401BS26-T

Overview

MAX6401BS26-T from Maxim Integrated is an ultra-low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-trimmed 2.63V reset threshold (±2.5% over –40°C to +85°C), 100ms minimum reset timeout, and 500nA typical supply current at 3.0V. It monitors VCC from 1.2V to 5.5V and guarantees valid reset output down to VCC = 1.0V, used in battery-powered portable systems requiring reliable power-on reset and brownout protection.

For engineers reviewing the MAX6401BS26-T datasheet, MAX6401BS26-T pinout, MAX6401BS26-T application, or MAX6401BS26-T equivalent, this device delivers precision voltage supervision with manual reset input, immunity to short VCC transients, and chip-scale packaging optimized for space-constrained portable electronics.

Technical Context

The MAX6401BS26-T implements a precision bandgap reference comparator with factory-trimmed 2.63V threshold and 6.3mV hysteresis, ensuring stable trip point across temperature. Its internal timer enforces a guaranteed 100ms (min) reset timeout after VCC rises above VTH, and it asserts RESET high during undervoltage conditions - unlike active-low variants.

It features a manual reset input (MR) with internal 50kΩ pullup, TTL/CMOS-compatible logic levels, and 1µs minimum pulse width requirement. The device operates over full industrial temperature range (–40°C to +85°C) and remains functional with VCC as low as 1.0V, enabling robust reset behavior during deep brownouts.

Key Specifications

Pinout & Package

MAX6401BS26-T is housed in a 4-bump UCSP (Ultra-Compact Silicon Package), 2mm × 2mm footprint, 0.5mm bump pitch, bottom-side solder terminations. This chip-scale package reduces board area by 70% versus SC70 and eliminates leadframe parasitics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6401BS26-T, the MAX6401BS27-T offers identical functionality with a 70mV higher threshold for tighter brownout guardbanding, while the TPS3808G125DBVR trades ultra-low power and chip-scale size for broader supply range and automotive qualification - but adds layout overhead and current penalty.

Availability

MAX6401BS26-T is available at Aetrix Electronics and suitable for portable medical sensors, smart wearables, and industrial handheld terminals requiring stable component supply, long-term lifecycle support, and consistent UCSP-4 packaging.

Supply support for MAX6401BS26-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 precision analog and mixed-signal ICs for power, sensing, and interface applications, with emphasis on high-reliability, low-power solutions.

The MAX6400–MAX6405 family was developed specifically for ultra-low-power microprocessor supervision in space-constrained portable electronics, delivering factory-trimmed thresholds and chip-scale packaging without external components.

FAQ

What is the exact reset threshold voltage of MAX6401BS26-T and how is it specified over temperature?

The MAX6401BS26-T has a nominal reset threshold of 2.63V, with ±2.5% accuracy guaranteed over the full industrial temperature range of –40°C to +85°C. At +25°C, the typical threshold is 2.63V, with min/max limits of 2.564V and 2.692V respectively. This specification ensures reliable brownout detection across environmental extremes without recalibration.

Does MAX6401BS26-T require external components to operate?

No, MAX6401BS26-T requires no external components. Its precision bandgap reference, factory-trimmed threshold, and push-pull output eliminate the need for external resistors, capacitors, or voltage dividers. The MR input includes an internal 50kΩ pullup, and the active-high RESET output drives µP reset pins directly - reducing BOM count and PCB area.

What is the minimum VCC voltage at which MAX6401BS26-T guarantees correct reset output logic state?

MAX6401BS26-T guarantees correct reset output logic state - i.e., RESET remains high when VCC < 2.63V - down to VCC = 1.0V. This ensures deterministic reset assertion even during deep brownout conditions common in single-cell lithium battery applications nearing end-of-life.

How does the manual reset (MR) input behave on MAX6401BS26-T?

On MAX6401BS26-T, the MR input is active-low with internal 50kΩ pullup to VCC. Pulling MR low asserts RESET high immediately, and RESET remains high for the full 100ms (min) timeout after MR returns high. Glitch rejection filters pulses shorter than 100ns, and the input accepts TTL/CMOS logic levels - enabling direct switch or GPIO interfacing.

What package type and dimensions does MAX6401BS26-T use, and what are its assembly implications?

MAX6401BS26-T uses a 4-bump UCSP (Ultra-Compact Silicon Package), measuring 2.0mm × 2.0mm with 0.5mm bump pitch. It requires reflow soldering at peak temperature up to +235°C. Due to its chip-scale nature, assembly demands controlled stencil design, precise placement, and attention to PCB pad metallurgy and thermal profile - but delivers 70% smaller footprint than SC70.