Analog Devices Inc./Maxim Integrated MAX6385XS23D4-T

Overview

MAX6385XS23D4-T from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit with factory-set 2.31V reset threshold, 1120ms VCC reset timeout, and manual reset input. It monitors single supply voltage (1.0V–5.5V), consumes only 3μA at 1.8V, guarantees valid reset output down to VCC = 1V, and operates across –40°C to +125°C for use in battery-powered industrial controllers.

For engineers reviewing the MAX6385XS23D4-T datasheet, MAX6385XS23D4-T pinout, MAX6385XS23D4-T application, or MAX6385XS23D4-T equivalent, key selection criteria include reset threshold accuracy (±2.5% over temperature), MR input pullup resistance (63kΩ), open-drain vs. push-pull output configuration, and SC70-4 package compatibility with space-constrained embedded designs.

Technical Context

This device implements a precision bandgap-based reset comparator with ±2.5% threshold accuracy over –40°C to +125°C and 60ppm/°C tempco. Its internal timer enforces a guaranteed minimum 1120ms reset assertion after VCC recovery, independent of supply ramp rate.

The MR input features a 63kΩ internal pullup resistor, accepts TTL/CMOS logic levels, and triggers reset on low assertion with 1µs minimum pulse width and 100ns glitch rejection. Reset output remains valid and actively driven from VCC = 1V upward.

Key Specifications

Pinout & Package

MAX6385XS23D4-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 high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6385XS23D4-T, MAX6385XS23D3-T reduces reset hold time by 87.5% for rapid-reboot systems, while TLV809K23DBZR trades MR functionality and SC70-4 layout compatibility for minimal footprint - both require validation of timeout alignment with target processor's reset timing specification.

Availability

MAX6385XS23D4-T is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-powered data loggers, automotive body control modules, and medical point-of-care monitors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6385XS23D4-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.

MAX6385XS23D4-T belongs to the MAX6381–MAX6390 family of low-power μP supervisory circuits engineered for reliable power-monitoring in space- and energy-constrained embedded systems.

FAQ

What is the exact reset threshold voltage of MAX6385XS23D4-T?

The MAX6385XS23D4-T has a factory-set reset threshold of 2.31V, specified with ±2.5% accuracy over the full operating temperature range of –40°C to +125°C. This value is derived from the "23" suffix in the part number, corresponding to the 2.31V nominal threshold in the Reset Thresholds table of the datasheet. The device guarantees correct reset assertion when VCC falls below this threshold and release when VCC rises above it.

Does MAX6385XS23D4-T support manual reset functionality?

Yes, MAX6385XS23D4-T includes a debounced manual reset input (MR) with an internal 63kΩ pullup resistor to VCC. Driving MR low forces an immediate active-high reset assertion, which remains active for the full 1120ms timeout period after MR is released. No external components are required, and the input rejects glitches as short as 100ns, making it suitable for direct connection to mechanical switches or digital logic outputs.

What package type and dimensions does MAX6385XS23D4-T use?

MAX6385XS23D4-T is packaged in a lead-free, RoHS-compliant 4-pin SC70 (SOT-323) package with outline number 21-0098 and land pattern 90-0187. Its physical dimensions are 2.0mm × 2.1mm × 0.95mm, and it features a thermal resistance of θJA = 322.6°C/W on a multilayer PCB. This compact footprint supports high-density routing in portable and space-limited applications.

Can MAX6385XS23D4-T operate reliably at VCC = 1.0V?

Yes, MAX6385XS23D4-T guarantees correct reset output logic state down to VCC = 1.0V. Its push-pull active-high RESET output remains functional and drives valid logic levels even at this minimum supply voltage, ensuring deterministic behavior during deep brownout conditions. This capability is explicitly verified in the Electrical Characteristics table and Typical Operating Characteristics plots.

Is MAX6385XS23D4-T pin-compatible with other members of the MAX6381–MAX6390 family?

MAX6385XS23D4-T shares identical pinout and package (4-pin SC70) with all other XS-suffix variants in the MAX6381–MAX6390 family, including MAX6384, MAX6386, and MAX6390. However, pin compatibility does not imply functional equivalence - differences in reset polarity (active-high vs. active-low), presence of RESET IN, or MR timeout timing require verification against the specific application's reset architecture and timing budget.