Analog Devices Inc./Maxim Integrated MAX6388XS19D1-T

Overview

MAX6388XS19D1-T from Maxim Integrated is a low-power, dual-voltage microprocessor supervisory circuit with active-high push-pull reset output, 1.90V factory-set VCC reset threshold (±2.5% over –40°C to +125°C), 1ms minimum reset timeout, and auxiliary RESET IN input for monitoring a second voltage source. It consumes only 3μA at +1.8V and guarantees valid reset state down to VCC = 1V, used in battery-powered instrumentation and dual-rail embedded systems.

For engineers reviewing the MAX6388XS19D1-T datasheet, MAX6388XS19D1-T pinout, MAX6388XS19D1-T application, or MAX6388XS19D1-T equivalent, key selection factors include its 4-pin SC70 package, 1.90V reset threshold accuracy, 1ms reset timeout, auxiliary voltage monitoring capability, and compatibility with dual-supply microcontroller power domains.

Technical Context

The MAX6388XS19D1-T integrates two independent reset comparators: one monitors VCC against a precision 1.90V internal threshold, while the second compares an external voltage applied to RESET IN against a stable +1.27V reference. Its reset assertion logic triggers on either comparator violation and holds the active-high push-pull RESET output asserted for ≥1ms after recovery.

This device operates across –40°C to +125°C with ±2.5% reset threshold accuracy, supports VCC supply from 1.0V to 5.5V, and features negative-going VCC transient immunity up to 100mV overdrive with pulse widths under 35µs - critical for noisy industrial power rails.

Key Specifications

Pinout & Package

MAX6388XS19D1-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 and automotive applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6388XS19D1-T, the μDFN variant offers superior thermal dissipation but occupies more board area, while TLV809K33DBZR sacrifices dual-supply supervision and timeout flexibility for lower unit cost and smaller 3-pin footprint - trade-offs require validation against actual system voltage monitoring architecture.

Availability

MAX6388XS19D1-T is available at Aetrix Electronics and suitable for battery-powered instrumentation, dual-voltage microcontroller systems, and automotive body control modules requiring stable component supply, long-lifecycle support, and AEC-Q100–compliant variants.

Supply support for MAX6388XS19D1-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 industrial, automotive, communications, and computing markets.

The MAX6381–MAX6390 family delivers low-power, factory-trimmed microprocessor supervisory circuits targeting space- and power-constrained embedded systems requiring dual-voltage monitoring and guaranteed reset behavior across extended temperature ranges.

FAQ

What is the exact reset threshold voltage of MAX6388XS19D1-T and how stable is it over temperature?

The MAX6388XS19D1-T has a factory-set nominal VCC reset threshold of 1.90V, with guaranteed accuracy of ±2.5% over the full operating temperature range of –40°C to +125°C. This stability is achieved through laser-trimming during production and BiCMOS process design, ensuring consistent brownout detection without external calibration. The MAX6388XS19D1-T maintains this specification under all specified supply and load conditions.

Does MAX6388XS19D1-T support monitoring of a second voltage rail, and how is it implemented?

Yes, MAX6388XS19D1-T includes a dedicated RESET IN pin that compares an external voltage to an internal +1.27V reference. To monitor a second rail (e.g., 3.3V or 2.5V), connect a resistor divider between that rail and GND, feeding the midpoint to RESET IN. The threshold is set using R1 = R2 × ((V_INTH/1.27V) – 1). This enables true dual-supply supervision within a single 4-pin SC70 package - a capability confirmed in the MAX6388XS19D1-T datasheet Pin Description and Applications Information sections.

What is the function and electrical behavior of the RESET output on MAX6388XS19D1-T?

The RESET output of MAX6388XS19D1-T is an active-high push-pull driver. It asserts high when VCC falls below 1.90V or when RESET IN falls below +1.27V, and remains high for ≥1ms after both inputs recover. It sources up to 800µA at VCC ≥ 4.5V and sinks up to 3.2mA, eliminating external pullup components. The MAX6388XS19D1-T guarantees correct logic state down to VCC = 1V, making it suitable for deep brownout recovery scenarios.

Can MAX6388XS19D1-T operate from a 1.2V supply, and what are the implications for reset validity?

MAX6388XS19D1-T supports VCC down to 1.0V per Absolute Maximum Ratings and Electrical Characteristics tables. While the 1.90V reset threshold cannot be met below VCC = 1.90V, the device guarantees valid RESET output state (high or low) down to VCC = 1V - meaning it will not float or oscillate during undervoltage conditions. This behavior is explicitly documented in the "Ensuring a Valid RESET Output Down to VCC = 0V" section, confirming deterministic operation during power collapse. The MAX6388XS19D1-T remains functional and predictable even as supply decays past its own trip point.

Is MAX6388XS19D1-T qualified for automotive applications, and what packaging options support that qualification?

The MAX6388XS19D1-T itself is not automotive-qualified; however, the /V variant (e.g., MAX6388XS19D1/V+T) is AEC-Q100 qualified and offered in the same 4-pin SC70 package. The /V suffix denotes automotive qualification, including extended temperature testing, reliability stress screening, and PPAP documentation. Standard MAX6388XS19D1-T parts are rated for –40°C to +125°C operation but lack formal AEC-Q100 certification. For automotive use, specify the /V version - MAX6388XS19D1/V+T - which shares identical electrical specs and pinout with the standard MAX6388XS19D1-T.