Analog Devices Inc./Maxim Integrated MAX6388XS19D6-T

Overview

MAX6388XS19D6-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 1.90V ±2.5% reset threshold, and 560ms minimum VCC reset timeout. It monitors VCC from +1.0V to +5.5V, consumes only 3μA at +1.8V, and features auxiliary RESET IN input for dual-voltage monitoring-used in battery-powered industrial controllers requiring reliable brownout detection.

For engineers reviewing the MAX6388XS19D6-T datasheet, MAX6388XS19D6-T pinout, MAX6388XS19D6-T application, or MAX6388XS19D6-T equivalent, key selection criteria include its 1.90V reset threshold accuracy over –40°C to +125°C, guaranteed reset validity down to VCC = 1V, 4-pin SC70 package footprint, and compatibility with dual-supply systems using external resistor-divider on RESET IN.

Technical Context

The MAX6388XS19D6-T implements a precision bandgap-based voltage comparator for VCC monitoring and a separate +1.27V reference comparator for the auxiliary RESET IN input. Its internal timer ensures reset assertion for exactly 560ms (min) after VCC recovers above 1.90V or after RESET IN rises above its derived threshold.

This device operates across full industrial temperature range (–40°C to +125°C) with ±2.5% reset threshold tolerance and supports negative-going VCC transient immunity up to 35µs at 100mV overdrive. The 4-pin SC70 package integrates no internal pullup on MR (not present), but includes high-impedance RESET IN with ≤50nA leakage.

Key Specifications

Pinout & Package

MAX6388XS19D6-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. Pin 1 is RESET (active-high push-pull), Pin 2 is VCC, Pin 3 is GND, and Pin 4 is RESET IN.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6388XS19D6-T, the LT version offers improved thermal resistance (θJA = 477°C/W vs. 322.6°C/W) in µDFN, while the XS19D6 variant with open-drain output enables wired-OR reset arbitration but adds BOM cost and layout complexity.

Availability

MAX6388XS19D6-T is available at Aetrix Electronics and suitable for industrial controllers, battery-powered sensors, dual-rail FPGA systems, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6388XS19D6-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 qualification - engineered for robust operation in harsh environments where power integrity is mission-critical.

FAQ

What is the exact reset threshold voltage of MAX6388XS19D6-T and how stable is it over temperature?

The MAX6388XS19D6-T has a factory-set nominal reset threshold of 1.90V, with ±2.5% tolerance over the full –40°C to +125°C operating range. This means the actual threshold remains between 1.85V and 1.95V across temperature, ensuring consistent brownout detection without external trimming. The device uses a precision bandgap reference and achieves 60ppm/°C tempco, verified per Maxim's Electrical Characteristics table.

Does MAX6388XS19D6-T support monitoring of a second voltage rail, and how is it implemented?

Yes, MAX6388XS19D6-T supports dual-voltage supervision via its dedicated RESET IN pin. This input compares an external voltage to an internal +1.27V reference; when the applied voltage falls below that threshold, reset asserts. Users set the effective threshold using a resistor divider - for example, a 100kΩ top resistor and 68.1kΩ bottom resistor yields ~1.90V at RESET IN. The input draws ≤50nA, enabling high-impedance divider networks.

What is the function and timing behavior of the RESET output on MAX6388XS19D6-T?

The RESET output of MAX6388XS19D6-T is an active-high push-pull driver. It goes high when VCC drops below 1.90V or when RESET IN falls below its derived threshold, and remains high for a guaranteed minimum of 560ms after recovery. The output is valid down to VCC = 1V, and its VOH exceeds 0.8×VCC when sourcing 150µA - ensuring clean logic levels even during marginal supply conditions.

Is MAX6388XS19D6-T compatible with standard microprocessor reset inputs, and what are its drive capabilities?

Yes, MAX6388XS19D6-T is fully compatible with standard μP reset inputs due to its active-high push-pull output. It can source up to 150µA at VCC ≥ 1.8V while maintaining VOH ≥ 0.8×VCC, and sink up to 80µA at VCC ≥ 1.0V with VOL ≤ 0.3V. This meets or exceeds typical μP reset pin requirements (e.g., ARM Cortex-M, PIC, MSP430), eliminating need for external level-shifting or buffering.

What package type and footprint does MAX6388XS19D6-T use, and are land patterns available?

MAX6388XS19D6-T uses a 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm with gull-wing leads. This compact RoHS-compliant footprint is optimized for high-density PCBs. Official land patterns and solder-reflow profiles are published by Maxim Integrated and accessible via their packages portal - no adaptation needed for standard SMT assembly.