Analog Devices Inc./Maxim Integrated MAX6386XS26D2-T

Overview

MAX6386XS26D2-T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 2.63V reset threshold (±2.5% over –40°C to +125°C), 20ms minimum reset timeout, and debounced manual reset input (MR) featuring internal 63kΩ pullup. It operates from 1.0V to 5.5V supply and consumes only 3μA at 1.8V, targeting power-sensitive embedded systems requiring reliable brownout detection and operator-initiated reset.

For engineers reviewing the MAX6386XS26D2-T datasheet, MAX6386XS26D2-T pinout, MAX6386XS26D2-T application, or MAX6386XS26D2-T equivalent, key selection criteria include its 4-pin SC70 package, VCC monitoring only (no auxiliary RESET IN), guaranteed valid reset state down to VCC = 1V, and compatibility with battery-powered controllers and dual-rail voltage systems where precise low-voltage supervision is critical.

Technical Context

The MAX6386XS26D2-T implements a precision bandgap-based reset comparator with ±2.5% threshold accuracy across –40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a fixed 20ms minimum reset assertion period after VCC recovers above 2.63V or after MR release.

It features an open-drain RESET output requiring external pullup, a debounced MR input tolerant of TTL/CMOS logic levels, and immunity to negative-going VCC transients up to 100mV overdrive for durations under ~30µs - enabling robust operation in noisy power environments without external filtering.

Key Specifications

Pinout & Package

MAX6386XS26D2-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.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD2+T and TPS3808G33DBVR, MAX6386XS26D2-T uniquely delivers 2.63V supervision, 20ms timeout, MR functionality, and open-drain output in a 4-pin SC70 - making it the only option among the three that satisfies all four requirements simultaneously for 2.6V-core embedded designs.

Availability

MAX6386XS26D2-T is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-powered data loggers, dual-rail embedded systems, and automotive body control modules requiring stable component supply and long-term production continuity.

Supply support for MAX6386XS26D2-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.

MAX6386XS26D2-T belongs to the MAX6381–MAX6390 family of single-supply microprocessor supervisors, engineered specifically for low-voltage, low-quiescent-current power monitoring in space- and energy-constrained systems.

FAQ

What is the exact reset threshold voltage of MAX6386XS26D2-T and how stable is it over temperature?

The MAX6386XS26D2-T has a nominal reset threshold of 2.63V, with a guaranteed range of 2.56V to 2.69V at +25°C and ±2.5% variation over –40°C to +125°C. Its 60ppm/°C tempco ensures minimal drift across industrial temperature extremes, making it suitable for applications where consistent 2.6V rail supervision is critical - such as in battery-backed memory controllers or low-power sensor nodes where threshold accuracy directly impacts functional safety margins.

Does MAX6386XS26D2-T support monitoring of a second voltage rail like VIO or VCORE?

No, MAX6386XS26D2-T monitors only the VCC supply rail and does not include an auxiliary RESET IN input. That feature is reserved for MAX6387–MAX6389 variants. The MAX6386XS26D2-T is a single-rail supervisor; for dual-voltage monitoring, consider MAX6387XS26D2-T (same threshold/timing but adds RESET IN pin) or redesign with discrete resistor-divider supervision on a second channel.

What is the function of the MR pin on MAX6386XS26D2-T and how should it be used in practice?

The MR (Manual Reset) pin on MAX6386XS26D2-T is an active-low input with internal 63kΩ pullup to VCC. Driving MR low forces a reset regardless of VCC level, and reset remains asserted for the full 20ms timeout after MR is released. In practice, connect a normally-open momentary switch from MR to GND for field service reset; no external debounce components are needed due to built-in filtering. Leaving MR unconnected defaults to inactive (pulled high).

Can MAX6386XS26D2-T operate reliably when VCC drops below 1.8V?

Yes, MAX6386XS26D2-T guarantees correct reset output behavior down to VCC = 1.0V, including valid logic states for both RESET and MR pins. Its 3μA supply current at 1.8V and operational specification down to 1.0V make it suitable for deep brownout scenarios - for example, in energy-harvesting systems or end-of-battery-life conditions where VCC may sag to 1.2V before shutdown. However, RESET output voltage low (VOL) is specified only down to VCC = 1.0V with 80µA sink current.

Is MAX6386XS26D2-T pin-compatible with older Maxim reset ICs like MAX809 or MAX6326?

No, MAX6386XS26D2-T is not pin-compatible with MAX809 (3-pin SC70) or MAX6326 (SOT-23-3), as it uses a 4-pin SC70 package with dedicated MR and RESET pins. While the MAX6386XS26D2-T is functionally and footprint-compatible with other 4-pin SC70 variants in the MAX6384–MAX6390 series (e.g., MAX6384XS26D2-T), substitution requires PCB layout revision to accommodate the fourth pin. Electrical compatibility exists, but mechanical replacement is not drop-in.