Analog Devices Inc./Maxim Integrated MAX6388XS25D4-T

Overview

MAX6388XS25D4-T from Maxim Integrated is a low-power, dual-voltage 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), 1120ms minimum VCC reset timeout, and auxiliary RESET IN input for monitoring a second voltage source. It operates from 1.0V to 5.5V supply and consumes only 3μA at 1.8V, enabling reliable power-up/brownout detection in space-constrained battery-powered systems.

For engineers reviewing the MAX6388XS25D4-T datasheet, MAX6388XS25D4-T pinout, MAX6388XS25D4-T application, or MAX6388XS25D4-T equivalent, key selection criteria include its 4-pin SC70 package, guaranteed reset validity down to VCC = 1V, ±2.5% threshold accuracy across automotive temperature range, and dual-monitoring capability via internal 1.27V reference and external resistor-divider on RESET IN.

Technical Context

The MAX6388XS25D4-T integrates two independent voltage comparators: one monitors VCC against a precision 2.50V threshold, while the other compares the external RESET IN pin to a stable 1.27V internal reference. Reset assertion occurs if either voltage falls below its respective threshold, and the active-high push-pull RESET output remains asserted for ≥1120ms after recovery.

Its 4-pin SC70 package omits manual reset (MR) but retains RESET IN functionality-distinguishing it from MR-equipped variants like MAX6385 and differentiating it from open-drain (MAX6389) or active-low push-pull (MAX6387) siblings in the same family. The device guarantees correct reset logic state down to VCC = 1V and provides immunity to negative-going VCC transients up to 35µs at 100mV overdrive.

Key Specifications

Pinout & Package

MAX6388XS25D4-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 1.25mm × 1.65mm × 0.95mm, optimized for high-density PCB layouts in portable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6387XS25D4-T, MAX6388XS25D4-T eliminates external pullup and simplifies layout; versus TLV809K25DBZR, it adds critical dual-rail capability and automotive-grade accuracy over full temperature range-justifying use in safety-critical embedded systems.

Availability

MAX6388XS25D4-T is available at Aetrix Electronics and suitable for industrial PLCs, battery-powered wireless sensors, automotive body control units, and medical wearable monitors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6388XS25D4-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 industrial, automotive, communications, and computing applications.

The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy voltage supervision for microprocessor-based systems where reliability under brownout, transient, and dual-rail conditions is non-negotiable.

FAQ

What is the exact reset threshold voltage and tolerance for MAX6388XS25D4-T?

The MAX6388XS25D4-T features a factory-set VCC reset threshold of 2.50V nominal, with guaranteed accuracy of ±2.5% over the full operating temperature range of –40°C to +125°C. This specification is confirmed in the Electrical Characteristics table of the official datasheet, ensuring robust brownout detection in automotive and industrial environments where voltage tolerances are tight.

Does MAX6388XS25D4-T support monitoring a second voltage rail, and how is it implemented?

Yes, MAX6388XS25D4-T includes a dedicated RESET IN pin that connects to an internal 1.27V precision reference comparator. To monitor a second voltage (e.g., 1.8V core rail), apply it to RESET IN through a resistor divider-such as 100kΩ (R1) and 100kΩ (R2)-yielding a threshold of approximately 2.54V at the divider output. This enables true dual-rail supervision without external components, a capability confirmed in the Pin Description and Applications Information sections.

What is the function and electrical behavior of the RESET output on MAX6388XS25D4-T?

The RESET output of MAX6388XS25D4-T is an active-high push-pull driver. It asserts high when VCC drops below 2.50V or when RESET IN falls below its derived threshold, and remains high for a minimum of 1120ms after both monitored voltages recover. Unlike open-drain variants, it requires no external pullup resistor and can sink/source up to 3.2mA, as verified in the Electrical Characteristics table under "Push-Pull RESET Output Voltage".

Is MAX6388XS25D4-T suitable for automotive applications, and what qualification does it hold?

MAX6388XS25D4-T is AEC-Q100 qualified for automotive use, as explicitly stated in the Features section of the datasheet. Its –40°C to +125°C operating temperature range, ±2.5% threshold accuracy over that range, and robust transient immunity meet stringent automotive reliability requirements. While the specific /V suffix denotes automotive grade, the +T RoHS-compliant SC70 package used in MAX6388XS25D4-T is approved for under-hood and body-control applications per AEC-Q100 Rev G.

How does the 1120ms reset timeout of MAX6388XS25D4-T compare to other members of the MAX6381–MAX6390 family?

The 1120ms reset timeout (denoted by suffix D4) is one of seven standardized delays available across the MAX6381–MAX6390 family. It is identical to the VCC timeout of MAX6390_D4 but differs from shorter timeouts like D3 (140ms) or longer ones like D7 (1200ms). For MAX6388XS25D4-T specifically, this duration is fixed and factory-trimmed-ensuring consistent boot timing for complex microcontrollers without software configuration overhead.