Analog Devices Inc./Maxim Integrated MAX6386LT28D7+

Overview

MAX6386LT28D7+ from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 2.80V reset threshold (±2.5% over –40°C to +125°C), 1200ms minimum VCC reset timeout, and debounced manual reset input. It monitors single-supply rails in battery-powered embedded systems where reliable power-on reset and brownout protection are critical.

For engineers reviewing the MAX6386LT28D7+ datasheet, MAX6386LT28D7+ pinout, MAX6386LT28D7+ application, or MAX6386LT28D7+ equivalent, key selection criteria include its guaranteed valid reset state down to VCC = 1V, 3μA supply current at 1.8V, 4-pin SC70 package, and compatibility with dual-voltage monitoring architectures requiring external pullup on RESET.

Technical Context

The MAX6386LT28D7+ implements a precision bandgap-based voltage comparator for VCC monitoring against a fixed 2.80V threshold, paired with a temperature-stable RC timer generating a guaranteed-minimum 1200ms reset assertion after VCC recovery. Its internal 63kΩ MR pullup resistor enables direct connection of a momentary switch to GND without external components.

Unlike dual-input variants (e.g., MAX6387–MAX6389), MAX6386LT28D7+ lacks RESET IN functionality and uses only VCC as the monitored rail. Its open-drain RESET output requires an external pullup resistor and supports wired-OR configurations in multi-rail systems.

Key Specifications

Pinout & Package

MAX6386LT28D7+ 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 portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326XR28D7+T and TPS3808G33DBVR, MAX6386LT28D7+ uniquely combines precise 2.80V monitoring, 1200ms timeout, and integrated manual reset in a 4-pin SC70-enabling compact, self-contained reset supervision without external components.

Availability

MAX6386LT28D7+ 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 and long-term lifecycle support.

Supply support for MAX6386LT28D7+ 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 power, sensing, and interface applications in industrial, automotive, and computing markets.

The MAX6381–MAX6390 family delivers ultra-low-power, factory-trimmed reset supervisors targeting space- and power-constrained embedded systems requiring high reliability across extended temperature ranges.

FAQ

What is the exact reset threshold voltage of MAX6386LT28D7+ and how stable is it over temperature?

The MAX6386LT28D7+ has a factory-set reset threshold of 2.80V with ±2.5% accuracy over the full operating temperature range of –40°C to +125°C. Its 60ppm/°C tempco ensures minimal drift, making it suitable for automotive and industrial applications where thermal stability is critical. This specification is guaranteed-not typical-and applies directly to the MAX6386LT28D7+ device.

Does MAX6386LT28D7+ support manual reset, and what are the electrical requirements for the MR pin?

Yes, MAX6386LT28D7+ features an active-low 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., <0.84V at 2.8V VCC). The input rejects glitches shorter than 1µs and tolerates noise up to 100ns. No external components are needed-just connect a momentary switch from MR to GND. This MR functionality is confirmed for MAX6386LT28D7+ in the official datasheet.

What package type and footprint does MAX6386LT28D7+ use, and is it RoHS-compliant?

MAX6386LT28D7+ is supplied in a 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm. The "+" suffix confirms it is lead(Pb)-free and RoHS-compliant. This compact, surface-mount package supports high-density PCB layouts in portable and battery-powered equipment where space is constrained. All mechanical data applies specifically to MAX6386LT28D7+.

Can MAX6386LT28D7+ operate reliably at very low supply voltages, and what is its minimum functional VCC?

Yes, MAX6386LT28D7+ guarantees correct reset output logic state down to VCC = 1.0V, ensuring deterministic behavior during deep brownout conditions. Its supply current remains as low as 3μA at 1.8V, and absolute maximum ratings allow VCC as low as –0.3V (with derating). This capability is explicitly specified for MAX6386LT28D7+ and enables robust operation in energy-harvesting and ultra-low-power systems.

How does the open-drain RESET output of MAX6386LT28D7+ differ from push-pull alternatives, and what external component is required?

The open-drain RESET output of MAX6386LT28D7+ requires an external pullup resistor to the target logic rail (e.g., 3.3V or 5V) to define the high state. This enables level shifting, wired-OR reset busing, and compatibility with mixed-voltage systems-unlike push-pull outputs which fix the high-level voltage to VCC. The datasheet specifies VOL ≤0.3V at 1.2mA sink, confirming strong low-side drive. This architecture is intrinsic to MAX6386LT28D7+ and distinct from pin-compatible push-pull variants.