Analog Devices Inc./Maxim Integrated MAX6385XS25D2-T

Overview

MAX6385XS25D2-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 2.50V ±2.5% reset threshold, and 20ms minimum reset timeout period. It monitors VCC from +1.8V to +5.5V while consuming only 3μA at +1.8V, and guarantees valid reset state down to VCC = 1V. It is used in portable battery-powered equipment requiring reliable power-on reset and brownout protection.

For engineers reviewing the MAX6385XS25D2-T datasheet, MAX6385XS25D2-T pinout, MAX6385XS25D2-T application, or MAX6385XS25D2-T equivalent, key selection criteria include reset threshold accuracy over temperature (±2.5% from −40°C to +125°C), manual reset input with internal 63kΩ pullup, 4-pin SC70 package footprint, and compatibility with dual-voltage systems requiring stable reset assertion during supply transients.

Technical Context

The MAX6385XS25D2-T implements a precision bandgap-based voltage comparator monitoring VCC against a fixed 2.50V threshold, with ±2.5% tolerance over −40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a guaranteed-minimum 20ms reset pulse after VCC rises above threshold.

It features a debounced active-low manual reset input (MR) with 1µs minimum pulse width support and 100ns glitch rejection, and asserts reset on either VCC drop below threshold or MR low assertion. Reset output is active-high push-pull, sourcing up to 800µA at VCC ≥ 4.5V and sinking 3.2mA when asserted.

Key Specifications

Pinout & Package

MAX6385XS25D2-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, suitable 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 MAX6385XS25D2-T, MAX6326XR25D2-T omits MR functionality to reduce cost and size, while TPS3125M25DBVR trades tighter threshold tolerance for longer timeout and incompatible packaging - making MAX6385XS25D2-T optimal for space-constrained, MR-enabled 2.5V systems needing precise 20ms reset timing.

Availability

MAX6385XS25D2-T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, industrial PLC I/O modules, and dual-rail embedded controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6385XS25D2-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 power management, sensing, and interface applications in industrial, automotive, and computing markets.

The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy reset supervision for battery-operated and thermally demanding systems, with emphasis on guaranteed operation from −40°C to +125°C and minimal external component count.

FAQ

What is the exact reset threshold voltage of MAX6385XS25D2-T and how stable is it over temperature?

The MAX6385XS25D2-T has a factory-set nominal reset threshold of 2.50V, with guaranteed tolerance of ±2.5% over the full operating temperature range of −40°C to +125°C. Its temperature coefficient is 60ppm/°C, meaning threshold drift is limited to approximately ±15mV across the entire range - sufficient for robust 2.5V rail supervision in industrial and automotive environments where MAX6385XS25D2-T is deployed.

Does MAX6385XS25D2-T support manual reset, and what are the electrical requirements for the MR pin?

Yes, MAX6385XS25D2-T includes 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 (for VTH < 4V) for ≥1µs. The pin rejects glitches ≤100ns and provides 200ns propagation delay from MR low to RESET assertion. No external components are required unless noise immunity is needed - then a 0.1μF capacitor from MR to GND is recommended.

What package type and dimensions does MAX6385XS25D2-T use, and is it RoHS-compliant?

MAX6385XS25D2-T uses a 4-pin SC70 package (outline 21-0098), measuring 2.0mm × 2.1mm × 0.95mm with 0.65mm pin pitch. The "+T" suffix confirms it is lead(Pb)-free and RoHS-compliant. This compact footprint enables high-density placement in portable electronics where MAX6385XS25D2-T is commonly used for power supervision.

How does MAX6385XS25D2-T behave when VCC drops below 1.0V, and is reset output still valid?

MAX6385XS25D2-T guarantees correct reset output logic state only down to VCC = 1.0V. Below that, the internal circuitry cannot maintain defined output levels. However, the device continues asserting reset as VCC falls - and the active-high push-pull output remains low (reset asserted) until VCC reaches ~0.8V, after which behavior is unspecified. For applications requiring valid reset down to 0V, external pullup/pulldown resistors are needed - though this is not supported for MAX6385XS25D2-T's push-pull output per datasheet guidance.

Is MAX6385XS25D2-T pin-compatible with other members of the MAX6381–MAX6390 family, and which ones share the same 4-pin SC70 footprint?

Yes, MAX6385XS25D2-T shares identical 4-pin SC70 pinout with all "XS"-suffixed variants in the MAX6381–MAX6390 family, including MAX6384XSxxDx-T and MAX6386XSxxDx-T. All have VCC (pin 1), RESET (pin 2), MR (pin 3), and GND (pin 4). This allows direct substitution within the same reset threshold and timeout combinations - for example, MAX6385XS25D2-T can replace MAX6384XS25D2-T if active-high reset is preferred over active-low.