Analog Devices Inc./Maxim Integrated MAX6388XS27D5-T

Overview

MAX6388XS27D5-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 2.70V VCC reset threshold (±2.5% over –40°C to +125°C), 280ms 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-sensitive embedded systems requiring reliable brownout detection.

For engineers reviewing the MAX6388XS27D5-T datasheet, MAX6388XS27D5-T pinout, MAX6388XS27D5-T application, or MAX6388XS27D5-T equivalent, key selection criteria include its 2.70V reset threshold accuracy, 280ms timeout timing, 4-pin SC70 package footprint, dual-supply monitoring capability via RESET IN, and guaranteed reset validity down to VCC = 1V.

Technical Context

The MAX6388XS27D5-T integrates a precision voltage comparator for VCC monitoring against a trimmed 2.70V threshold and a separate +1.27V reference comparator for the RESET IN pin, enabling independent supervision of a second supply rail. Its internal timer ensures reset assertion for ≥280ms after VCC or RESET IN recovers above their respective thresholds.

It features an active-high push-pull RESET output that drives high during fault conditions and deasserts low after timeout - eliminating need for external pullup. The device guarantees correct logic state for VCC ≥ 1V and provides immunity to negative-going VCC transients up to 100mV overdrive with durations under ~300ns.

Key Specifications

Pinout & Package

MAX6388XS27D5-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, suitable for space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6388XS27D5-T, the μDFN variant offers superior thermal handling in dense layouts, while the TLV809E27DBZR trades dual-monitoring capability for smaller size and lower unit cost in simpler systems.

Availability

MAX6388XS27D5-T is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, medical wearable sensors, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6388XS27D5-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, emphasizing low power, high reliability, and small form factor.

The MAX6381–MAX6390 family delivers single/dual low-voltage microprocessor reset circuits optimized for battery-powered and thermally constrained systems where supply monitoring accuracy, ultra-low ICC, and compact packaging are critical.

FAQ

What is the exact reset threshold voltage of MAX6388XS27D5-T and how stable is it over temperature?

The MAX6388XS27D5-T has a factory-set VCC reset threshold of 2.70V, specified with ±2.5% tolerance over the full operating temperature range of –40°C to +125°C. This stability is achieved through laser trimming during production and is guaranteed by design, not just typical performance. The device uses a precision bandgap reference and low-drift comparator architecture to maintain threshold accuracy without external components - critical for consistent system behavior in automotive and industrial environments where voltage margins are tight.

Does MAX6388XS27D5-T support monitoring of a second voltage rail, and how is it implemented?

Yes, MAX6388XS27D5-T supports dual-voltage monitoring via its dedicated RESET IN pin. This pin connects to an internal +1.27V reference comparator, allowing users to set a custom reset threshold for a secondary supply using an external resistor divider. When the voltage at RESET IN falls below +1.27V, the device asserts reset - independently of VCC status. This enables true dual-rail supervision in a single 4-pin SC70 package, reducing system complexity versus using two separate reset ICs.

What is the function of the RESET output on MAX6388XS27D5-T, and what are its drive capabilities?

The RESET output of MAX6388XS27D5-T is an active-high push-pull driver. During fault conditions (VCC or RESET IN below threshold), it actively drives high; upon recovery, it pulls low to deassert reset. It sources up to 800µA at VCC ≥ 4.5V and sinks up to 3.2mA when asserted - sufficient to directly drive most µP reset inputs without external buffering. Its guaranteed valid state down to VCC = 1.0V ensures deterministic behavior during deep brownout, unlike open-drain alternatives requiring pullups.

How does the 280ms reset timeout of MAX6388XS27D5-T benefit system reliability?

The 280ms minimum reset timeout of MAX6388XS27D5-T ensures the host microprocessor remains held in reset long enough for all power rails to fully stabilize, oscillators to achieve lock, and internal registers to clear - preventing erratic code execution during marginal power-up conditions. This timing aligns with common LDO settling times and crystal oscillator start-up delays in 32-bit MCUs. Unlike shorter timeouts (e.g., 1ms or 20ms), it eliminates risk of premature release into unstable states, especially in systems with multiple cascaded regulators or high-capacitance loads.

Is MAX6388XS27D5-T qualified for automotive applications, and what package options support this?

The MAX6388XS27D5-T itself is not automotive-qualified; however, the MAX6388XS27D5/V+T variant (identical electrical specs with "/V" suffix) is AEC-Q100 qualified for automotive use. Both share the same 4-pin SC70 package, but only the "/V" version undergoes extended temperature screening and qualification testing per AEC-Q100 Rev G. For non-automotive industrial applications, MAX6388XS27D5-T provides identical performance in the same compact footprint - making it ideal for high-reliability non-automotive systems needing proven robustness without formal automotive certification overhead.