Analog Devices Inc./Maxim Integrated MAX6388XS25D2-T

Overview

MAX6388XS25D2-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), 20ms 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, targeting power-sensitive embedded systems requiring reliable brownout detection.

For engineers reviewing the MAX6388XS25D2-T datasheet, MAX6388XS25D2-T pinout, MAX6388XS25D2-T application, or MAX6388XS25D2-T equivalent, key selection factors include its 2.50V reset threshold accuracy, 20ms VCC reset timeout, 4-pin SC70 package footprint, and dual-monitoring capability via RESET IN comparator referenced to 1.27V.

Technical Context

The MAX6388XS25D2-T integrates a precision bandgap-based voltage monitor for VCC and a separate high-impedance RESET IN comparator referenced to an internal 1.27V threshold. Reset assertion occurs when either VCC falls below 2.50V or RESET IN drops below 1.27V, with independent timing control governed by a factory-programmed 20ms timeout.

Its active-high push-pull RESET output guarantees valid logic state down to VCC = 1.0V and supports direct interface with μP reset inputs without external pullup. The device features negative-going VCC transient immunity up to 35µs for 100mV overdrive and includes built-in glitch rejection on RESET IN.

Key Specifications

Pinout & Package

MAX6388XS25D2-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 industrial designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6388XS25D2-T, the μDFN-packaged MAX6388LT25D2-T offers improved thermal dissipation but occupies more board area, while TLV809M25DBZR sacrifices dual-supply monitoring and precise 20ms timing for cost and size reduction in less demanding systems.

Availability

MAX6388XS25D2-T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, dual-voltage systems, and critical microprocessor power monitoring requiring stable component supply and long-term lifecycle support.

Supply support for MAX6388XS25D2-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 computing applications, emphasizing low power, high reliability, and integration.

The MAX6381–MAX6390 family delivers single/dual low-voltage supervisory circuits optimized for battery-operated and thermally constrained systems requiring accurate, ultra-low-quiescent-current reset generation.

FAQ

What is the exact reset threshold voltage of MAX6388XS25D2-T and how stable is it over temperature?

The MAX6388XS25D2-T has a factory-set VCC reset threshold of 2.50V, guaranteed within ±2.5% over the full operating temperature range of −40°C to +125°C. This stability is achieved through laser-trimmed bandgap references and validated across process corners, ensuring consistent brownout detection in automotive and industrial environments without external calibration.

Does MAX6388XS25D2-T support monitoring of a second voltage, and how is it implemented?

Yes, MAX6388XS25D2-T supports dual-voltage monitoring via its dedicated RESET IN pin, which connects to an internal comparator referenced to 1.27V. To monitor a second rail, apply the target voltage through a resistor divider so that the divided voltage equals 1.27V at the desired trip point - for example, a 3.3V rail uses R1/R2 ≈ 1.60 per the formula R1 = R2 × ((V_INTH/1.27) − 1).

What is the function and timing behavior of the RESET output on MAX6388XS25D2-T?

The RESET output of MAX6388XS25D2-T is an active-high push-pull driver that transitions high when VCC or RESET IN falls below their respective thresholds, and remains high for a guaranteed minimum 20ms after both voltages recover. It guarantees valid logic levels down to VCC = 1.0V and can sink 1.2mA at 2.5V, enabling direct connection to most microprocessor reset inputs without external components.

Can MAX6388XS25D2-T operate from a 1.2V supply, and what is its minimum functional VCC?

MAX6388XS25D2-T operates from 1.0V to 5.5V, so it functions fully at 1.2V. Its internal circuitry remains active and the RESET output maintains correct logic state down to VCC = 1.0V - verified across temperature - making it suitable for ultra-low-voltage applications such as energy-harvesting sensors or deeply scaled logic domains where supply may dip below 1.8V.

Is MAX6388XS25D2-T pin-compatible with other devices in the MAX6381–MAX6390 family, and what are the package constraints?

MAX6388XS25D2-T uses a 4-pin SC70 package and is pin-compatible with other 4-pin SC70 variants in the MAX6381–MAX6390 family (e.g., MAX6384XS25D2-T, MAX6385XS25D2-T), sharing identical pinout: Pin 1 = VCC, Pin 2 = RESET, Pin 3 = GND, Pin 4 = RESET IN. It is not pin-compatible with 3-pin SC70 or 6-pin μDFN versions due to differing pin count and function allocation.