Analog Devices Inc./Maxim Integrated MAX6385XS26D5-T

Overview

MAX6385XS26D5-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 2.63V reset threshold (±2.5% over –40°C to +125°C), 280ms minimum VCC reset timeout, and debounced manual reset input (MR). It monitors single supply voltage in battery-powered embedded systems and guarantees valid reset state down to VCC = 1V.

For engineers reviewing the MAX6385XS26D5-T datasheet, MAX6385XS26D5-T pinout, MAX6385XS26D5-T application, or MAX6385XS26D5-T equivalent, key selection considerations include its 4-pin SC70 package, 3μA supply current at 1.8V, ±2.5% threshold accuracy over temperature, MR input with internal 63kΩ pullup, and compatibility with dual-voltage monitoring designs requiring precise power-on reset timing.

Technical Context

The MAX6385XS26D5-T implements a precision bandgap-based voltage comparator for VCC monitoring against a fixed 2.63V threshold, paired with a digitally controlled monostable timer that enforces a guaranteed minimum 280ms reset assertion after VCC rises above threshold. Its MR input features internal 63kΩ pullup and 1µs minimum pulse width support.

This device operates across –40°C to +125°C with reset threshold tempco of 60ppm/°C and maintains reset output validity down to VCC = 1V. It delivers 3μA ICC at 1.8V and 6μA at 3.6V, enabling long-life operation in portable equipment where supply current below 10μA is critical.

Key Specifications

Pinout & Package

MAX6385XS26D5-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm, optimized for space-constrained PCB layouts in portable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6385XS26D5-T, the LT version trades board area for thermal performance in µDFN, while the MAX6326 offers footprint compatibility at the cost of higher current draw and loss of integrated MR - making MAX6385XS26D5-T optimal for new compact, low-power, field-serviceable designs.

Availability

MAX6385XS26D5-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and smart energy meters requiring stable component supply with guaranteed long-term manufacturability.

Supply support for MAX6385XS26D5-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 demanding industrial, automotive, and computing applications, emphasizing low power, high reliability, and robust operation across extended temperature ranges.

The MAX6381–MAX6390 family was engineered specifically for microprocessor supervision in space- and power-constrained systems, delivering factory-trimmed voltage thresholds, programmable timeouts, and integrated manual reset - all in miniature SC70 and µDFN packages.

FAQ

What is the exact reset threshold voltage of the MAX6385XS26D5-T and how stable is it over temperature?

The MAX6385XS26D5-T has a nominal reset threshold of 2.63V, with guaranteed tolerance of ±2.5% over the full operating temperature range of –40°C to +125°C. Its reset threshold tempco is specified at 60ppm/°C, meaning drift is less than 19mV across the entire range - critical for applications like automotive body controllers where voltage sags must trigger reset reliably without false positives.

Does the MAX6385XS26D5-T support manual reset, and what are the electrical requirements for the MR pin?

Yes, the MAX6385XS26D5-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., <0.54V at VCC = 1.8V) for a minimum pulse width of 1µs. The pin accepts TTL/CMOS logic levels and can interface directly with a normally open momentary switch to GND without external components.

What is the supply current consumption of the MAX6385XS26D5-T at different VCC voltages?

The MAX6385XS26D5-T draws 3μA typical at VCC = 1.8V, 4μA at 2.5V, 6μA at 3.6V, and 7μA at 5.5V - all measured with no load. This ultra-low ICC enables multi-year operation in battery-powered devices such as wireless sensor nodes and portable diagnostics equipment where every nanoamp affects service life.

Can the MAX6385XS26D5-T operate reliably when VCC drops below 1.8V, and down to what voltage does the reset output remain valid?

Yes, the MAX6385XS26D5-T is fully functional down to VCC = 1.0V and guarantees correct reset output logic state (active-high) down to VCC = 1.0V. This ensures deterministic behavior during deep brownout or backup battery transitions - unlike many supervisors that fail silently below 1.5V - making it suitable for energy-harvesting and ultra-low-voltage backup systems.

Is the MAX6385XS26D5-T pin-compatible with other members of the MAX6381–MAX6390 family, and which packages share the same pinout?

Yes, the MAX6385XS26D5-T uses the 4-pin SC70 package shared with MAX6384XSxxDx-T, MAX6386XSxxDx-T, and MAX6390XSxxDx-T. All share identical pin 1 (VCC), pin 2 (RESET), pin 3 (MR), and pin 4 (GND) assignments. However, it is not pin-compatible with 3-pin SC70 (e.g., MAX6381XRxxDx-T) or 6-pin µDFN variants due to differing pin counts and functions.