Analog Devices Inc./Maxim Integrated MAX6385XS45D6-T

Overview

MAX6385XS45D6-T from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit with factory-set 4.50V reset threshold, 560ms minimum VCC reset timeout, and manual reset input. It monitors +1.8V to +5.0V supply rails in low-power embedded systems, consumes only 3μA at +1.8V, guarantees valid reset output down to VCC = 1V, and operates across –40°C to +125°C for industrial and automotive applications.

For engineers reviewing the MAX6385XS45D6-T datasheet, MAX6385XS45D6-T pinout, MAX6385XS45D6-T application, or MAX6385XS45D6-T equivalent, this page delivers verified electrical parameters, SC70-4 package details, reset timing behavior, MR debounce capability, and direct alternatives for power-rail monitoring in battery-powered controllers and critical μP systems.

Technical Context

The MAX6385XS45D6-T implements a precision voltage comparator with ±2.5% reset threshold accuracy over temperature (–40°C to +125°C) and 60ppm/°C tempco, paired with a monolithic timer generating a guaranteed-minimum 560ms reset assertion after VCC recovery. Its internal 63kΩ MR pullup enables TTL/CMOS-compatible manual reset triggering without external components.

Unlike open-drain variants, this device uses an active-high push-pull RESET output capable of sourcing 800µA at VCC ≥ 4.5V while maintaining VOH ≥ 0.8×VCC - ensuring robust logic-level compatibility with modern μP reset inputs. It lacks auxiliary RESET IN functionality, confirming its role as a single-rail, dedicated VCC monitor with manual override.

Key Specifications

Pinout & Package

MAX6385XS45D6-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 and automotive modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6385XS45D6-T, MAX6385XS46D6-T provides higher reset threshold for tighter 4.6V rail margining, while TPS3124E18DBVR trades MR support and adjustable threshold for smaller size and lower-voltage optimization - neither is pin-compatible, requiring layout revision.

Availability

MAX6385XS45D6-T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, portable medical sensor hubs, and smart energy meter MCU subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6385XS45D6-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 communications applications, with emphasis on power efficiency, reliability, and integration.

The MAX6381–MAX6390 family delivers single/dual low-power μP supervisory circuits targeting space- and current-constrained systems needing guaranteed reset timing, factory-trimmed thresholds, and robust transient immunity.

FAQ

What is the exact reset threshold voltage of MAX6385XS45D6-T and how tightly is it specified?

The MAX6385XS45D6-T has a nominal reset threshold of +4.50V, with guaranteed accuracy of ±2.5% over the full operating temperature range (–40°C to +125°C). This means the actual threshold falls between +4.39V (min) and +4.61V (max) under all conditions, as confirmed in the Reset Thresholds table of the datasheet. The device achieves this using laser-trimmed on-chip resistors, eliminating external calibration.

Does MAX6385XS45D6-T support manual reset, and what is the internal pullup value?

Yes, MAX6385XS45D6-T includes a debounced manual reset (MR) input with an internal 63kΩ pullup resistor to VCC. Driving MR low forces an immediate reset, which remains active for the full 560ms timeout after MR is released. The pullup allows direct connection of a momentary switch to GND without external components, and the 1µs minimum pulse width requirement rejects mechanical bounce.

What package type and dimensions does MAX6385XS45D6-T use, and is it RoHS-compliant?

MAX6385XS45D6-T uses a 4-pin SC70 package (outline 21-0098), measuring 2.0mm × 2.1mm × 0.95mm. It is lead(Pb)-free and RoHS-compliant, indicated by the "+" suffix in the part number. The land pattern (90-0187) is optimized for standard reflow profiles, and thermal resistance θJA is 322.6°C/W on a multilayer board.

Can MAX6385XS45D6-T operate reliably at VCC = 1.0V, and what happens to the RESET output below that?

Yes, MAX6385XS45D6-T guarantees correct RESET output logic state down to VCC = 1.0V - meaning RESET remains high during fault and deasserts cleanly upon recovery within spec. Below 1.0V, the device ceases functional operation; the RESET output is no longer guaranteed, and external pulldown/pullup resistors are required only if valid logic levels must be maintained all the way to 0V (not supported natively by this push-pull variant).

How does the 560ms reset timeout of MAX6385XS45D6-T compare to other members of the MAX6381–MAX6390 family?

The 560ms timeout corresponds to the "D6" suffix in MAX6385XS45D6-T and is one of seven standardized delays (1ms to 1200ms) available across the family. It sits between 280ms (D5) and 1120ms (D4), making it suitable for mid-duration hold times - e.g., allowing LDOs and clock oscillators to settle before μP execution resumes. No other member shares identical timing and threshold; D6 is unique to this specific configuration.