Analog Devices Inc./Maxim Integrated MAX6404BS46-T

Overview

MAX6404BS46-T from Maxim Integrated is an ultra-low-power active-high push-pull µP supervisory circuit designed to monitor 4.63V system supply rails in battery-powered devices. It asserts a logic-high RESET signal when VCC falls below its factory-trimmed 4.63V threshold (±2.5% over –40°C to +85°C), guarantees valid reset output down to VCC = 1.0V, and features a 100ms minimum reset timeout period. Used in portable electronics requiring precise brownout detection and manual reset capability.

For engineers reviewing the MAX6404BS46-T datasheet, MAX6404BS46-T pinout, MAX6404BS46-T application, or MAX6404BS46-T equivalent, this page delivers verified specifications, UCSP-4 package details, reset timing behavior, MR input interface guidance, and validated alternative options for voltage-monitoring supervisory design.

Technical Context

The MAX6404BS46-T implements a precision bandgap reference comparator with factory-trimmed 4.63V reset threshold and ±2.5% accuracy across –40°C to +85°C. Its active-high push-pull RESET output drives high (≥0.8×VCC at 500µA) when VCC is below threshold and transitions low after power-up delay, remaining asserted for ≥100ms.

It includes a manual reset input (MR) with internal 50kΩ pullup, 1µs minimum pulse width requirement, and 100ns glitch rejection. The device draws only 500nA typical supply current at 3.0V and operates from VCC = 1.2V to 5.5V, with guaranteed reset validity down to 1.0V.

Key Specifications

Pinout & Package

MAX6404BS46-T is housed in a 4-bump, 2mm × 2mm UCSP (Ultra Compact Silicon Package) - a chip-scale form factor with 0.5mm bump pitch and bottom-side interconnect. This package reduces board area by 70% versus SC70 and requires specific PCB layout and reflow guidelines per Maxim's UCSP Reliability Notice.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6404BS46-T, MAX6404BS45-T offers a lower threshold for tighter 4.5V rail monitoring but same footprint and performance, while TPS3808G33DBVR trades ultra-low power and active-high drive for wider availability and through-hole compatibility - making it less suitable for battery-critical 4.63V applications.

Availability

MAX6404BS46-T is available at Aetrix Electronics and suitable for portable medical monitors, smart wearables, industrial handheld scanners, POS terminal peripherals, and battery-backed data loggers requiring stable component supply and long-term lifecycle support.

Supply support for MAX6404BS46-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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.

The MAX6400–MAX6405 family was engineered for ultra-low-power voltage supervision in space-constrained, battery-operated systems - delivering precision reset thresholds, minimal quiescent current, and chip-scale packaging without external components.

FAQ

What is the exact reset threshold voltage of the MAX6404BS46-T?

The MAX6404BS46-T has a factory-trimmed nominal reset threshold of 4.63V, with guaranteed accuracy of ±2.5% over the full operating temperature range of –40°C to +85°C. At +25°C, the typical threshold is 4.63V, and the min/max limits are 4.514V and 4.746V respectively, as specified in Table 1 of the datasheet.

Does the MAX6404BS46-T require external components to operate?

No, the MAX6404BS46-T requires no external components for basic operation. Its precision bandgap reference, comparator, and timer are fully integrated. Only a bypass capacitor (recommended 0.1µF) on VCC is advised for noise suppression, and no pullup or trimming resistors are needed - enabling direct drop-in use in 4.63V monitoring applications.

How does the manual reset (MR) input function on the MAX6404BS46-T?

The MR input on the MAX6404BS46-T is active-low with an internal 50kΩ pullup to VCC. Pulling MR low asserts the active-high RESET output immediately and holds it high for the full 100ms reset timeout period after MR returns high. The input accepts TTL/CMOS logic levels and rejects glitches shorter than 100ns, making it robust against noise in handheld or industrial environments.

What package type and dimensions does the MAX6404BS46-T use?

The MAX6404BS46-T uses a 4-bump UCSP (Ultra Compact Silicon Package) measuring 2.0mm × 2.0mm with 0.5mm bump pitch. It is a bottom-terminated chip-scale package requiring specific PCB pad layout, solder mask definition, and reflow profile per Maxim's UCSP Reliability Notice - not compatible with standard SMT placement without process validation.

Can the MAX6404BS46-T operate reliably below 1.2V?

Yes - the MAX6404BS46-T guarantees correct reset output logic state down to VCC = 1.0V, though its specified operating range begins at 1.2V. This extended validity enables safe system shutdown sequencing during deep brownout conditions, allowing firmware to execute last-chance save routines before power collapse, a critical capability confirmed in the Absolute Maximum Ratings and Detailed Description sections.