Analog Devices Inc./Maxim Integrated MAX6388XS25D5-T

Overview

MAX6388XS25D5-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 2.50V VCC reset threshold (±2.5% over –40°C to +125°C), 280ms minimum reset timeout, and auxiliary RESET IN input for dual-voltage monitoring. It operates from 1.0V to 5.5V supply and consumes only 3μA at 1.8V, enabling reliable power-on reset in battery-powered industrial controllers.

For engineers reviewing the MAX6388XS25D5-T datasheet, MAX6388XS25D5-T pinout, MAX6388XS25D5-T application, or MAX6388XS25D5-T equivalent, key selection considerations include its 4-pin SC70 package, guaranteed reset validity down to VCC = 1V, ±2.5% threshold accuracy over temperature, and support for user-adjustable secondary voltage monitoring via RESET IN comparator referenced to +1.27V.

Technical Context

The MAX6388XS25D5-T integrates a precision bandgap reference and comparator to monitor VCC against a fixed 2.50V threshold while simultaneously comparing an external voltage at RESET IN to an internal +1.27V reference. Reset asserts when either voltage falls below its respective threshold.

It features a digital timeout timer that holds the active-high RESET output asserted for ≥280ms after VCC or RESET IN recovers, with immunity to negative-going VCC transients up to 35µs at 100mV overdrive. The device guarantees correct logic state of RESET down to VCC = 1V and includes no internal MR pin - distinguishing it from MAX6384–MAX6386/MAX6390 variants.

Key Specifications

Pinout & Package

MAX6388XS25D5-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 embedded designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6388XS25D5-T, the μDFN-based MAX6388LT25D5-T offers improved thermal performance but requires more PCB area, while TLV809E25DBZR reduces cost and size at the expense of dual-monitoring capability and longer timeout flexibility.

Availability

MAX6388XS25D5-T is available at Aetrix Electronics and suitable for industrial PLC I/O modules, battery-powered sensor nodes, automotive body control units, and medical portable diagnostics requiring stable component supply with guaranteed long-term availability.

Supply support for MAX6388XS25D5-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, sensing, connectivity, and security applications in industrial, automotive, and computing markets.

The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy microprocessor supervisory circuits optimized for space-constrained, battery-operated, and thermally demanding embedded systems requiring dual-voltage monitoring and guaranteed reset behavior across extended temperature ranges.

FAQ

What is the exact reset threshold voltage and tolerance for MAX6388XS25D5-T?

The MAX6388XS25D5-T has a factory-set VCC reset threshold of 2.50V with ±2.5% accuracy over the full operating temperature range of –40°C to +125°C. This specification is guaranteed by design and applies to all production units. The threshold is trimmed during manufacturing and does not require external calibration. The MAX6388XS25D5-T uses this fixed threshold to initiate reset when VCC falls below 2.44V (min) or rises above 2.56V (max) under worst-case conditions.

Does MAX6388XS25D5-T support manual reset functionality?

No, the MAX6388XS25D5-T does not include a manual reset (MR) input. Unlike MAX6384–MAX6386 or MAX6390 variants, this part lacks MR pin functionality. Its pinout consists solely of VCC, RESET, GND, and RESET IN. If manual reset capability is required, consider MAX6385XS25D5-T (4-pin SC70, same threshold/timing, with MR) or MAX6390XS25D5-T (4-pin SC70, with MR and split timeout periods). The MAX6388XS25D5-T relies exclusively on automatic voltage monitoring for reset generation.

How is the RESET IN pin used in MAX6388XS25D5-T, and what voltage does it monitor?

The RESET IN pin on MAX6388XS25D5-T connects to an internal comparator referenced to +1.27V (±2.5% over temperature). It monitors an external voltage - typically derived from a resistor divider across a secondary supply rail - and asserts reset if that voltage falls below the +1.27V threshold. To set a custom threshold (e.g., 3.1V), use R1 = R2 × ((V_INTH/1.27) − 1); for R2 = 100kΩ and V_INTH = 3.1V, R1 ≈ 144kΩ. The MAX6388XS25D5-T guarantees ≤50nA input leakage, enabling high-value resistors without accuracy loss.

What is the guaranteed minimum reset timeout period for MAX6388XS25D5-T?

The MAX6388XS25D5-T has a guaranteed minimum reset timeout period of 280ms after VCC or RESET IN recovers above their respective thresholds. This value corresponds to the "D5" suffix in the part number and is specified under worst-case conditions across temperature and supply voltage. The actual timeout may extend up to 560ms (typical max), but system design must rely on the 280ms minimum to ensure μP initialization completes before reset deassertion. This timing aligns with common ARM and RISC-V boot ROM requirements.

Is MAX6388XS25D5-T qualified for automotive applications?

The MAX6388XS25D5-T is not explicitly automotive-qualified. While it operates across –40°C to +125°C and meets AEC-Q100 stress test requirements *for specific /V trim versions*, the "-T" suffix indicates standard commercial/industrial grade packaging. Automotive-grade equivalents carry "/V+T" in the ordering code (e.g., MAX6388XS25D5/V+T). For ASIL-B systems, verify qualification status per datasheet Ordering Information table and consult Analog Devices' automotive product documentation before deployment. The MAX6388XS25D5-T itself is rated for industrial use only.