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). It monitors VCC from +1.8V to +5.0V while consuming only 3μA at +1.8V and guarantees valid reset state down to VCC = 1V - used in portable battery-powered equipment for reliable power-up sequencing.

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, MR input with internal 63kΩ pullup, open-drain RESET requiring external pullup, and immunity to negative-going VCC transients up to 35µs at 100mV overdrive.

Technical Context

This device implements a precision voltage comparator monitoring VCC against a trimmed internal reference, coupled with a monostable timer that asserts RESET for ≥20ms after VCC rises above 2.63V or after MR release. The MR input features built-in glitch rejection (100ns) and 1µs minimum pulse width requirement.

The open-drain RESET output supports wired-OR configurations and level translation, sinking up to 3.2mA at VCC ≥ 4.5V (VOL ≤ 0.4V), with leakage <1.0µA when deasserted. Reset assertion is guaranteed functional down to VCC = 1.0V, enabling operation during deep brownout conditions.

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, with thermal resistance θJA = 322.6°C/W on multilayer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6386XS26D2+T, MAX6326XR26D2+T removes the need for an external pullup but forfeits wired-OR flexibility, while TPS3808G18DBVR offers tighter threshold tolerance and lower current but omits MR - making MAX6386XS26D2+T optimal for cost-sensitive, serviceable, multi-drop reset architectures.

Availability

MAX6386XS26D2+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, industrial controllers, automotive body electronics, and medical handsets requiring stable component supply and long-term lifecycle support.

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, mixed-signal, and power-management ICs for demanding industrial, automotive, and computing applications.

MAX6386XS26D2+T belongs to the MAX6381–MAX6390 family of ultra-low-power μP supervisory circuits, engineered specifically for reliable power-on reset, brownout protection, and manual reset in space-constrained, battery-sensitive 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 guaranteed accuracy of ±2.5% over the full operating temperature range of −40°C to +125°C. This stability is achieved via laser-trimmed internal references and low-tempco design, ensuring consistent brownout detection without external calibration. The MAX6386XS26D2+T maintains this specification across all production lots and environmental conditions specified in the datasheet.

Does MAX6386XS26D2+T require an external pullup resistor on the RESET pin?

Yes, MAX6386XS26D2+T features an open-drain active-low RESET output and requires an external pullup resistor to establish the high logic level. Typical values range from 10kΩ to 100kΩ, selected based on bus capacitance and rise-time requirements. The MAX6386XS26D2+T datasheet specifies VOL ≤ 0.4V at 3.2mA sink current, confirming compatibility with standard logic families when properly biased.

What is the function and electrical behavior of the MR pin on MAX6386XS26D2+T?

The MR pin on MAX6386XS26D2+T is an active-low manual reset input with an internal 63kΩ pullup resistor to VCC. Driving MR ≤ 0.3×VCC asserts RESET for the full 20ms timeout period after MR is released. The MAX6386XS26D2+T guarantees 100ns glitch rejection and accepts TTL/CMOS-compatible signals, enabling direct connection to switches, microcontrollers, or logic gates without external debounce circuitry.

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

Yes, MAX6386XS26D2+T is fully specified to operate down to VCC = 1.0V, with guaranteed RESET output logic state validity throughout this range. At VCC = 1.0V, the MAX6386XS26D2+T still sinks 80µA with VOL ≤ 0.3V and maintains accurate threshold detection - enabling robust brownout response in systems experiencing rapid supply collapse, such as battery-depleted portable devices.

Is MAX6386XS26D2+T pin-compatible with legacy Maxim reset ICs like MAX809?

Yes, MAX6386XS26D2+T is pin-compatible with MAX809/MAX810/MAX803 and other members of the MAX6326–MAX6348 series in the same 4-pin SC70 package. This allows drop-in replacement in existing designs without PCB modification, provided the open-drain output configuration and MR functionality align with system requirements. The MAX6386XS26D2+T retains identical pinout (VCC, RESET, MR, GND) and footprint as these predecessors.