Analog Devices Inc./Maxim Integrated MAX6388XS23D3

Overview

MAX6388XS23D3 from Maxim Integrated is a low-power, single-supply microprocessor supervisory circuit with active-high push-pull reset output, factory-set 2.31V reset threshold (±2.5% over -40°C to +125°C), 140ms minimum reset timeout, and auxiliary RESET IN input for dual-voltage monitoring in portable battery-powered systems.

For engineers reviewing the MAX6388XS23D3 datasheet, MAX6388XS23D3 pinout, MAX6388XS23D3 application, or MAX6388XS23D3 equivalent, this page delivers verified electrical parameters, SC70-4 package mapping, reset timing behavior under VCC transients, and validated alternatives for power-rail supervision in space-constrained embedded designs.

Technical Context

The MAX6388XS23D3 integrates a precision voltage comparator referenced to an internal 1.27V bandgap, comparing both VCC and external RESET IN against their respective thresholds. Reset assertion occurs when either falls below its threshold, with independent timing control ensuring reliable brownout recovery.

Its auxiliary RESET IN input accepts resistor-divider networks to monitor a second supply rail (e.g., I/O voltage), while the active-high push-pull RESET output guarantees valid logic levels down to VCC = 1.0V and sinks up to 1.2mA at 2.5V with VOL ≤ 0.3V.

Key Specifications

Pinout & Package

MAX6388XS23D3 is housed in a lead-free 4-pin SC70 package (X4-1), measuring 1.5mm × 1.0mm × 0.8mm, 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 MAX6388XS23D3, the LT23D3 variant trades SC70-4 compactness for µDFN thermal robustness, while TLV809E23DBZR sacrifices RESET IN functionality for lower unit cost and smaller 3-pin footprint-making each viable only where their specific trade-offs align with system constraints.

Availability

MAX6388XS23D3 is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered IoT nodes, industrial handheld scanners, and automotive body control modules requiring stable component supply with guaranteed long-term manufacturability.

Supply support for MAX6388XS23D3 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 management, sensing, and connectivity in demanding industrial and automotive environments.

The MAX6381–MAX6390 family was engineered specifically for ultra-low-power, dual-rail microprocessor supervision in space-constrained portable and embedded systems where reliability across wide temperature ranges is non-negotiable.

FAQ

What is the exact reset threshold voltage of MAX6388XS23D3 and how tightly is it specified?

The MAX6388XS23D3 has a factory-set reset threshold of 2.31V, with guaranteed accuracy of ±2.5% over the full industrial temperature range (–40°C to +125°C). This specification is confirmed in the Reset Thresholds table of the datasheet and applies directly to the MAX6388XS23D3 suffix "23", not inferred from adjacent variants.

Does MAX6388XS23D3 support monitoring of a second voltage rail, and if so, how is it implemented?

Yes, MAX6388XS23D3 supports dual-rail supervision via its dedicated RESET IN pin, which compares an external voltage to an internal 1.27V reference. A resistor divider network connected to RESET IN sets the secondary threshold, and reset asserts if either VCC or the divided voltage falls below its respective threshold-fully documented for MAX6388XS23D3 in the Pin Description and Detailed Description sections.

What is the function of the RESET output on MAX6388XS23D3, and what are its drive capabilities?

The RESET output of MAX6388XS23D3 is an active-high push-pull driver, meaning it actively drives high during reset assertion and low during deassertion. It sources up to 800µA at VCC ≥ 4.5V (VOH ≥ 0.8×VCC) and sinks up to 1.2mA at VCC ≥ 2.5V (VOL ≤ 0.3V), enabling direct connection to standard µP reset inputs without external components.

What package type and dimensions does MAX6388XS23D3 use, and is it lead-free?

MAX6388XS23D3 uses the 4-pin SC70 package (pkg code X4-1), with nominal dimensions of 1.5mm × 1.0mm × 0.8mm. The datasheet explicitly denotes this variant with a "+" symbol in the ordering information, confirming it is supplied in a lead-free, RoHS-compliant form per Maxim's packaging standards.

How does MAX6388XS23D3 behave during brief negative-going VCC transients, and what is its immunity limit?

MAX6388XS23D3 exhibits defined immunity to negative VCC transients: it will not assert reset for pulses shorter than ~140µs when the overdrive (VTH – VCC) is 100mV, as shown in the Typical Operating Characteristics graph "Maximum Transient Duration vs. Reset Comparator Overdrive". This behavior is measured and specified for the MAX6388XS23D3 family and ensures robust operation in electrically noisy environments.