Analog Devices Inc./Maxim Integrated MAX6388XS20D6-T

Overview

MAX6388XS20D6-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 2.0V reset threshold (±2.5% over −40°C to +125°C), 560ms minimum VCC 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-critical embedded systems requiring reliable brownout detection.

For engineers reviewing the MAX6388XS20D6-T datasheet, MAX6388XS20D6-T pinout, MAX6388XS20D6-T application, or MAX6388XS20D6-T equivalent, this page delivers verified specifications, package mapping, real-world use cases, and validated alternative options - all confirmed against Maxim's official documentation and ordering guide.

Technical Context

The MAX6388XS20D6-T integrates a precision voltage comparator monitoring VCC against a fixed 2.0V threshold and a separate high-impedance RESET IN input referenced to an internal 1.27V bandgap. Reset assertion occurs when either voltage falls below its respective threshold, with independent timing control ensuring deterministic behavior during power transients.

Its active-high push-pull RESET output guarantees valid logic state down to VCC = 1.0V, and the device includes negative-going VCC transient immunity up to 35µs for 100mV overdrive. The RESET IN path features 4.5µs propagation delay and ±50nA leakage, enabling accurate external resistor-divider configuration for user-defined secondary thresholds.

Key Specifications

Pinout & Package

MAX6388XS20D6-T is packaged in a RoHS-compliant 4-pin SC70 (package code X4+1, outline 21-0098), footprint-compatible with industry-standard 0.65mm pitch layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6388XS20D6-T, the LT version trades package size for thermal margin while losing auxiliary monitoring, and the XS20D6 variant with MR offers human-interface flexibility at the cost of dual-supply visibility - selection depends strictly on whether RESET IN or MR functionality is prioritized in the target architecture.

Availability

MAX6388XS20D6-T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical wearable sensor hubs, and smart energy meters requiring stable component supply across extended temperature and long product lifecycles.

Supply support for MAX6388XS20D6-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 demanding industrial, automotive, and computing applications, with emphasis on low-power, high-reliability solutions.

The MAX6381–MAX6390 family delivers single/dual-supply microprocessor reset supervision with ultra-low quiescent current and AEC-Q100 qualified variants - engineered for fail-safe power monitoring in safety-critical embedded systems.

FAQ

What is the exact reset threshold voltage of MAX6388XS20D6-T and how stable is it over temperature?

The MAX6388XS20D6-T has a factory-set nominal reset threshold of 2.00V, with guaranteed tolerance of ±2.5% over the full operating temperature range of −40°C to +125°C. This stability is achieved through laser-trimmed internal resistors and a precision bandgap reference, ensuring consistent brownout detection without external calibration. The MAX6388XS20D6-T maintains this accuracy across automotive and industrial environments where thermal cycling is severe.

Does MAX6388XS20D6-T support monitoring of a second voltage rail, and how is it implemented?

Yes, the MAX6388XS20D6-T includes a dedicated RESET IN pin referenced to an internal 1.27V comparator threshold. To monitor a second voltage (e.g., 3.3V I/O rail), connect an external resistor divider between that rail and ground, with the midpoint fed to RESET IN. Using R1 = R2 × ((V_INTH/1.27V) − 1), designers can set custom thresholds - for example, a 3.3V rail maps to R1/R2 ≈ 1.60. The MAX6388XS20D6-T asserts reset if either VCC < 2.0V or RESET IN < 1.27V.

What is the function of the RESET output on MAX6388XS20D6-T, and what are its drive capabilities?

The RESET output of the MAX6388XS20D6-T is an active-high push-pull driver, meaning it actively drives high during reset assertion and low otherwise - no external pullup is required. It sources ≥800µA at VCC ≥ 4.5V (VOH ≥ 0.8×VCC) and sinks ≥3.2mA (VOL ≤ 0.4V). This allows direct interfacing with standard CMOS/TTL inputs and ensures clean signal edges without RC delays. The MAX6388XS20D6-T guarantees valid logic states down to VCC = 1.0V.

Can MAX6388XS20D6-T operate from a 1.2V supply, and what happens to reset behavior below 1.8V?

Yes, the MAX6388XS20D6-T operates from 1.0V to 5.5V, and its reset output remains functionally valid down to VCC = 1.0V - a key differentiator for ultra-low-voltage systems. At 1.2V, the 2.0V reset threshold is still enforced relative to the supply, so reset asserts when VCC drops below 2.0V (i.e., the device will assert reset immediately upon power-up until VCC exceeds 2.0V). The MAX6388XS20D6-T draws only ~4µA at 2.5V and ~3µA at 1.8V, scaling predictably per datasheet ICC curves.

Is MAX6388XS20D6-T pin-compatible with older Maxim reset ICs like MAX809 or MAX6326?

No, the MAX6388XS20D6-T is not pin-compatible with MAX809/MAX6326 series. Those devices use 3-pin SOT-23 or SC70 packages with different pinouts (e.g., VCC–GND–RESET), whereas MAX6388XS20D6-T uses a 4-pin SC70 with VCC–RESET–GND–RESET IN. However, it is functionally and footprint-compatible within the MAX6381–MAX6390 family - e.g., MAX6385XS20D6-T shares the same 4-pin SC70 layout but substitutes MR for RESET IN. Migration requires PCB revision.