Analog Devices Inc./Maxim Integrated MAX6388XS22D1-T

Overview

MAX6388XS22D1-T from Maxim Integrated is a low-power, single-supply microprocessor supervisory circuit with active-high push-pull reset output, factory-set 2.19V VCC reset threshold (±2.5% over -40°C to +125°C), 1ms 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 battery-powered embedded systems requiring reliable power-on reset and brownout protection.

For engineers reviewing the MAX6388XS22D1-T datasheet, MAX6388XS22D1-T pinout, MAX6388XS22D1-T application, or MAX6388XS22D1-T equivalent, key selection criteria include its 2.19V reset threshold accuracy, 1ms timeout timing, 4-pin SC70 package footprint, dual-monitoring capability via RESET IN, and guaranteed reset validity down to VCC = 1V.

Technical Context

The MAX6388XS22D1-T integrates a precision voltage comparator for VCC monitoring and a separate high-impedance RESET IN comparator referenced to an internal 1.27V bandgap, enabling user-configurable secondary voltage detection via external resistor divider. Its reset assertion logic triggers on either VCC falling below 2.19V or RESET IN falling below 1.27V.

It features a fixed 1ms minimum reset timeout after VCC recovery, active-high push-pull output capable of sourcing/sinking ≥150μA at 1.8V, and guaranteed correct output state down to VCC = 1V - critical for low-voltage system initialization integrity.

Key Specifications

Pinout & Package

MAX6388XS22D1-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, optimized for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6388LT22D1-T, the MAX6388XS22D1-T offers smaller PCB area but lower thermal headroom; versus TPS3808G12DBVR, it provides dual-rail supervision and tighter threshold accuracy at the cost of non-pin-compatible packaging and different timing options.

Availability

MAX6388XS22D1-T is available at Aetrix Electronics and suitable for battery-powered IoT sensors, industrial PLC I/O modules, medical wearables, automotive body control units, and dual-voltage embedded systems requiring stable component supply and long-term lifecycle support.

Supply support for MAX6388XS22D1-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 ultra-low-power, high-accuracy microprocessor reset supervision with flexible threshold, timeout, and monitoring configurations - specifically engineered for space- and energy-constrained embedded systems requiring guaranteed startup reliability.

FAQ

What is the exact reset threshold voltage of MAX6388XS22D1-T and how is it specified?

The MAX6388XS22D1-T has a factory-set VCC reset threshold of 2.19V nominal, with guaranteed tolerance of ±2.5% over the full operating temperature range (-40°C to +125°C). This value is derived from the "22" suffix in the part number per Maxim's Reset Threshold table, where "22" corresponds to 2.13V (min), 2.19V (nom), and 2.24V (max) at +25°C, and ±2.5% applies across temperature. The MAX6388XS22D1-T does not require external resistors to set this threshold.

Does MAX6388XS22D1-T support monitoring of a second voltage rail, and how is it implemented?

Yes, the MAX6388XS22D1-T supports dual-voltage monitoring via its dedicated RESET IN pin. This pin connects to an internal comparator referenced to a precise 1.27V bandgap voltage. To supervise a second rail (e.g., 3.3V or 5V), a resistor divider is placed between that rail and ground, with the midpoint connected to RESET IN. The divider ratio sets the effective threshold using the formula V_INTH = 1.27V × (R1/R2 + 1), enabling flexible secondary rail supervision without additional ICs.

What is the function and electrical behavior of the RESET output on MAX6388XS22D1-T?

The RESET output of MAX6388XS22D1-T is an active-high push-pull driver. It asserts (goes high) when either VCC falls below 2.19V or the voltage at RESET IN falls below 1.27V, and remains high for a minimum of 1ms after both monitored voltages recover above their thresholds. It can source ≥150μA at 1.8V and sink ≥80μA at 1.0V, eliminating the need for an external pullup resistor and simplifying interface to standard CMOS microcontroller reset inputs.

What package type and dimensions does MAX6388XS22D1-T use, and is it RoHS-compliant?

The MAX6388XS22D1-T uses a 4-pin SC70 package (outline number 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm. It is lead(Pb)-free and RoHS-compliant, indicated by the "+" suffix in the ordering code. This compact, surface-mount package supports reflow soldering at +260°C and is optimized for high-density portable electronics where board space is constrained.

How does MAX6388XS22D1-T ensure reliable reset operation during low-VCC conditions?

The MAX6388XS22D1-T guarantees correct RESET output logic state down to VCC = 1V, meaning it will assert or deassert the active-high signal reliably even as the supply collapses - critical for preventing undefined MCU states during brownout. Unlike open-drain or some push-pull supervisors, this guarantee is built into the silicon design and verified across temperature, ensuring deterministic behavior without external pulldown resistors or auxiliary circuitry.