Analog Devices Inc./Maxim Integrated MAX6388XS23D5-T

Overview

MAX6388XS23D5-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 2.31V 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 consumes only 3μA at +1.8V and guarantees valid reset state down to VCC = 1V, used in battery-powered controllers and intelligent instrumentation requiring reliable power-on reset and brownout protection.

For engineers reviewing the MAX6388XS23D5-T datasheet, MAX6388XS23D5-T pinout, MAX6388XS23D5-T application, or MAX6388XS23D5-T equivalent, key selection criteria include its 2.31V reset threshold accuracy, 280ms timeout, 4-pin SC70 package footprint, dual-supply monitoring capability via RESET IN, and AEC-Q100-qualified automotive availability.

Technical Context

The MAX6388XS23D5-T integrates a precision voltage comparator monitoring VCC against a factory-trimmed 2.31V threshold and a separate +1.27V reference comparator for the RESET IN pin, enabling independent monitoring of a second supply rail. Its internal timer ensures reset assertion remains active for ≥280ms after VCC or RESET IN recovers above their respective thresholds.

It features an active-high push-pull RESET output capable of sourcing 800µA at VCC ≥ 4.5V while maintaining VOH ≥ 0.8×VCC, and supports manual reset initiation only indirectly via external logic driving RESET IN - unlike MAX6384–MAX6386, it lacks a dedicated MR pin but uses RESET IN as a user-adjustable secondary reset trigger.

Key Specifications

Pinout & Package

MAX6388XS23D5-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 1.6mm × 1.6mm × 0.9mm with gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6388XS23D5-T, the LT23D5-T variant offers identical performance in a larger μDFN package with different thermal behavior, while TLV809K23DBZR provides baseline reset functionality at lower cost but omits the critical dual-rail monitoring feature essential for split-rail systems.

Availability

MAX6388XS23D5-T is available at Aetrix Electronics and suitable for battery-powered controllers, automotive body electronics, industrial sensor nodes, and portable medical devices requiring stable component supply and long-term lifecycle support.

Supply support for MAX6388XS23D5-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.

The MAX6381–MAX6390 family delivers low-power, high-accuracy μP supervisory circuits optimized for systems requiring dual-voltage monitoring, extended temperature operation, and minimal quiescent current - especially in automotive and portable equipment.

FAQ

What is the exact reset threshold voltage of the MAX6388XS23D5-T?

The MAX6388XS23D5-T has a factory-set VCC reset threshold of 2.31V, with guaranteed accuracy of ±2.5% over the full operating temperature range of -40°C to +125°C. This value is confirmed in the Reset Thresholds table of the datasheet (suffix "23" corresponds to nominal 2.31V). The MAX6388XS23D5-T uses this threshold to detect brownout conditions on the main supply rail.

Does the MAX6388XS23D5-T support manual reset functionality?

No, the MAX6388XS23D5-T does not include a dedicated manual reset (MR) input pin. Unlike MAX6384–MAX6386 or MAX6390, it lacks MR functionality. Instead, it provides a RESET IN pin for auxiliary voltage monitoring. To implement manual reset, external logic must drive the RESET IN pin low through a switch or GPIO - the MAX6388XS23D5-T itself does not interpret MR signals.

What package type and dimensions does the MAX6388XS23D5-T use?

The MAX6388XS23D5-T is packaged in a 4-pin SC70 (SOT-323) outline, designated X4+1 per Maxim's package code system. Its dimensions are 1.6mm × 1.6mm × 0.9mm with gull-wing leads. Land pattern number 90-0187 applies, and the package is RoHS-compliant (indicated by the "+" suffix in the part number).

Can the MAX6388XS23D5-T monitor two different supply voltages simultaneously?

Yes, the MAX6388XS23D5-T supports dual-voltage monitoring: VCC is monitored against its factory-set 2.31V threshold, and the RESET IN pin compares an external voltage to an internal +1.27V reference. By connecting a resistor divider to RESET IN, users can configure a second reset threshold - for example, to supervise a 3.3V or 1.8V rail. This dual-monitoring capability is a core function of the MAX6388XS23D5-T.

What is the minimum supply voltage at which the MAX6388XS23D5-T guarantees correct RESET output logic levels?

The MAX6388XS23D5-T guarantees valid RESET output logic states down to VCC = 1.0V. Specifically, the active-high push-pull output maintains VOH ≥ 0.8×VCC when not asserted and VOL ≤ 0.3V when asserted, even at VCC = 1.0V with 80µA sink current. This ensures reliable reset signaling during deep brownout conditions, a key specification confirmed in the Electrical Characteristics table.