Analog Devices Inc./Maxim Integrated MAX6400BS30-T

Overview

MAX6400BS30-T from Maxim Integrated is an ultra-low-power microprocessor supervisory circuit designed to monitor 3.0V system supply rails in portable electronics. It features a factory-trimmed 3.00V ±2.5% reset threshold, active-low push-pull RESET output, 100ms minimum reset timeout, and consumes only 500nA typical supply current at 3.0V. It ensures reliable power-on reset and brownout protection for battery-powered microcontrollers.

For engineers reviewing the MAX6400BS30-T datasheet, MAX6400BS30-T pinout, MAX6400BS30-T application, or MAX6400BS30-T equivalent, this device delivers precision voltage monitoring with guaranteed reset validity down to VCC = 1.0V, immunity to fast VCC transients, and manual reset input support - critical for low-power embedded system reliability validation and BOM optimization.

Technical Context

The MAX6400BS30-T implements a precision bandgap reference comparator with hysteresis (6.3mV) and temperature coefficient of 40ppm/°C, ensuring stable trip-point behavior across -40°C to +85°C. Its internal timer enforces a minimum 100ms reset assertion after VCC rises above 3.00V, preventing premature processor release during power-up.

It integrates a manual reset input (MR) with 50kΩ internal pullup, supporting TTL/CMOS-compatible logic levels and glitch rejection up to 100ns. The active-low push-pull RESET output drives low with ≤0.4V at 100µA sink (VCC ≥ 1.2V), enabling direct interface with µP reset pins without external components.

Key Specifications

Pinout & Package

MAX6400BS30-T is housed in a 4-bump UCSP (2×2 mm) chip-scale package, optimized for space-constrained portable designs. This ultra-compact footprint occupies ~30% of an SC70-4 area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3123E18DBVR and ADM6315-30ARTZ-RL7, the MAX6400BS30-T uniquely combines 3.0V accuracy, 500nA current, MR support, and UCSP-4 size - making it the only option meeting simultaneous requirements for long-life portable devices with user-reset capability and minimal PCB area.

Availability

MAX6400BS30-T is available at Aetrix Electronics and suitable for portable medical devices, Bluetooth sensors, wearables, and industrial handhelds requiring stable component supply and long-term lifecycle support.

Supply support for MAX6400BS30-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 specifically for ultra-low-power microprocessor supervision in space- and energy-constrained portable equipment, emphasizing precision threshold stability, minimal external components, and robust transient immunity.

FAQ

What is the exact reset threshold voltage of the MAX6400BS30-T?

The MAX6400BS30-T has a factory-trimmed nominal reset threshold of 3.00V, with tolerance of ±2.5% over the full operating temperature range (-40°C to +85°C). At +25°C, the threshold is specified as 2.955V (min) to 3.045V (max), per Table 1 in the datasheet. This precise value ensures reliable detection of brownout conditions in 3.0V systems without external calibration.

Does the MAX6400BS30-T require external components to operate?

No, the MAX6400BS30-T requires no external components. It integrates a precision bandgap reference, comparator, reset timer, and 50kΩ MR pullup resistor. The active-low push-pull RESET output eliminates the need for an external pullup, and the UCSP-4 package enables direct mounting without passive filtering - reducing BOM count and PCB area versus discrete supervisor solutions.

Can the MAX6400BS30-T operate with supply voltages below 3.0V?

Yes, the MAX6400BS30-T operates from 1.2V to 5.5V and guarantees correct RESET output logic state down to VCC = 1.0V. This allows it to remain functional during deep brownout or battery depletion scenarios where the monitored 3.0V rail collapses, ensuring the host microcontroller stays safely held in reset until stable power returns.

How does the manual reset (MR) input function on the MAX6400BS30-T?

The MR input on the MAX6400BS30-T is active-low with an internal 50kΩ pullup to VCC. Driving MR to GND asserts RESET immediately, and RESET remains asserted for the full 100ms timeout period after MR returns high. This enables simple momentary-switch interfacing without debouncing circuitry, and the 100ns glitch rejection prevents false triggers from noise.

What is the supply current consumption of the MAX6400BS30-T at 3.0V?

The MAX6400BS30-T draws only 500nA typical supply current at 3.0V and +25°C, with a maximum of 1.0µA over temperature. This ultra-low quiescent current is critical for extending battery life in always-on monitoring applications such as wearable health devices and remote sensors, enabling multi-year operation on small coin cells.