Analog Devices Inc./Maxim Integrated MAX6385XS35D4-T

Overview

MAX6385XS35D4-T from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit with factory-set 3.50V reset threshold, 1120ms VCC reset timeout, and manual reset input. It monitors +1.8V to +5.0V supply rails, consumes only 3μA at +1.8V, guarantees valid reset output down to VCC = 1V, and operates across –40°C to +125°C for use in battery-powered industrial controllers.

For engineers reviewing the MAX6385XS35D4-T datasheet, MAX6385XS35D4-T pinout, MAX6385XS35D4-T application, or MAX6385XS35D4-T equivalent, key selection criteria include its active-high push-pull reset output, 3.50V ±2.5% threshold accuracy over temperature, 1120ms VCC timeout / 140ms manual reset timeout, and 4-pin SC70 package compatibility with space-constrained embedded power-monitoring designs.

Technical Context

The device implements a precision voltage comparator with ±2.5% threshold accuracy over –40°C to +125°C and 60ppm/°C tempco, paired with a monotonic timeout timer that ensures minimum 1120ms assertion after VCC recovery. Its internal 63kΩ MR pullup resistor enables direct connection of a momentary switch to GND without external components.

Reset assertion occurs when VCC falls below 3.50V or MR is pulled low; deassertion follows a guaranteed 1120ms (VCC) or 140ms (MR) delay. The push-pull output drives high during reset with VOH ≥ 0.8×VCC at ISOURCE = 500µA (VCC ≥ 2.5V), ensuring robust interface with μP reset inputs.

Key Specifications

Pinout & Package

MAX6385XS35D4-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 1.3mm × 1.7mm × 0.95mm, suitable for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6385XS35D4-T, MAX6385XS35D3-T reduces reset hold time by 87.5% but retains identical threshold and MR functionality, while TPS3808G33DBVR trades precision threshold matching and MR capability for broader TI supply-chain availability and different packaging.

Availability

MAX6385XS35D4-T is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-powered data loggers, and automotive body control modules requiring stable component supply with AEC-Q100 qualification and long-term production support.

Supply support for MAX6385XS35D4-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 industrial, automotive, and computing applications, with emphasis on low-power, high-reliability solutions.

The MAX6381–MAX6390 family delivers single/dual low-voltage microprocessor supervisory circuits optimized for space-constrained, battery-sensitive systems requiring guaranteed reset behavior across extreme temperatures.

FAQ

What is the exact reset threshold voltage of MAX6385XS35D4-T and how tightly is it specified?

The MAX6385XS35D4-T has a factory-set reset threshold of 3.50V, with guaranteed accuracy of ±2.5% over the full operating temperature range of –40°C to +125°C. This specification means the actual threshold will fall between 3.41V and 3.59V at +25°C, and between 3.41V and 3.59V across all temperatures - confirmed in the Electrical Characteristics table under "VCC Reset Threshold" with ΔVTH/°C = 60ppm/°C.

Does MAX6385XS35D4-T support manual reset functionality, and what are the electrical requirements for the MR pin?

Yes, MAX6385XS35D4-T includes a debounced manual reset input (MR) with an internal 63kΩ pullup resistor to VCC. To assert reset, MR must be driven below 0.3×VCC (e.g., <1.05V at VCC = 3.5V). The minimum MR pulse width is 1µs, and it rejects glitches up to 100ns. The MR-to-RESET delay is 200ns, and the resulting reset remains active for 140ms after MR is released - all parameters verified in the Electrical Characteristics section.

What is the guaranteed minimum reset timeout period for MAX6385XS35D4-T when VCC recovers from a brownout?

The MAX6385XS35D4-T guarantees a minimum VCC reset timeout period of 1120ms after VCC rises above the 3.50V threshold. This value is defined by the "D4" suffix in the part number and confirmed in the Reset Timeout Delay table, where D4 corresponds to 1120ms (min) for MAX6381–MAX6389 devices. The timeout is monotonic and temperature-stable, with normalized variation ≤ ±1.5% across –40°C to +125°C per the Typical Operating Characteristics graph.

Can MAX6385XS35D4-T operate reliably at VCC = 1.8V, and what is its typical supply current at that voltage?

Yes, MAX6385XS35D4-T operates reliably from VCC = +1.0V to +5.5V, including 1.8V. At VCC = +1.8V and TA = +25°C, its typical supply current is 3μA, with a maximum of 6μA over temperature - specified in the Electrical Characteristics table under "VCC Supply Current." This ultra-low current enables multi-year operation in energy-harvesting and battery-backed applications.

What package type and dimensions does MAX6385XS35D4-T use, and is it RoHS-compliant?

MAX6385XS35D4-T uses a 4-pin SC70 package (outline number 21-0098, land pattern 90-0187), measuring 1.3mm × 1.7mm × 0.95mm. The "+T" suffix confirms it is lead(Pb)-free and RoHS-compliant. Thermal resistance is θJA = 322.6°C/W on a multilayer board, and the package supports reflow soldering at +260°C peak temperature - details verified in the Package Information section.