Analog Devices Inc./Maxim Integrated MAX6388XS45D1+T

Overview

MAX6388XS45D1+T from Maxim Integrated is a low-power, single-supply microprocessor supervisory circuit with active-high push-pull reset output, factory-set 4.50V reset threshold (±2.5% over -40°C to +125°C), 1ms minimum 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 MAX6388XS45D1+T datasheet, MAX6388XS45D1+T pinout, MAX6388XS45D1+T application, or MAX6388XS45D1+T equivalent, key selection criteria include its 4-pin SC70 package, guaranteed reset validity down to VCC = 1V, ±2.5% threshold accuracy over temperature, and support for secondary voltage monitoring via RESET IN comparator referenced to 1.27V.

Technical Context

The MAX6388XS45D1+T integrates a precision bandgap reference and comparator to monitor VCC against a fixed 4.50V threshold while simultaneously comparing an external voltage at RESET IN to an internal 1.27V reference. Reset asserts when either monitored voltage falls below its respective threshold.

Its active-high push-pull output drives high during reset assertion and guarantees correct logic state down to VCC = 1V. The device features negative-going VCC transient immunity and includes no internal manual reset input - distinguishing it from MAX6384–MAX6386 and MAX6390 variants.

Key Specifications

Pinout & Package

MAX6388XS45D1+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. This compact footprint supports high-density PCB layouts in space-constrained portable and automotive modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6388XS45D1+T, MAX6387XS45D1+T offers identical supervision accuracy and timing but requires external biasing for reset signaling, while TLV803EB29DBVR trades dual-rail capability for lower power and smaller footprint in simpler designs.

Availability

MAX6388XS45D1+T is available at Aetrix Electronics and suitable for industrial PLC power monitoring, automotive body control modules, medical wearable sensor hubs, and smart energy meter auxiliary rail supervision requiring stable component supply across extended temperature ranges.

Supply support for MAX6388XS45D1+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 demanding industrial, automotive, and communications applications.

The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy voltage supervision for microprocessor-based systems where supply integrity directly impacts functional safety and data reliability.

FAQ

What is the exact reset threshold voltage of MAX6388XS45D1+T and how stable is it over temperature?

The MAX6388XS45D1+T has a factory-set nominal reset threshold of 4.50V, with a minimum of 4.39V and maximum of 4.61V at +25°C. Over the full operating range of -40°C to +125°C, the threshold maintains ±2.5% accuracy, meaning it stays between 4.39V and 4.61V across temperature. This stability is achieved through laser trimming and on-chip bandgap referencing, making MAX6388XS45D1+T suitable for automotive and industrial applications where thermal drift must be tightly controlled.

Does MAX6388XS45D1+T support manual reset functionality?

No, MAX6388XS45D1+T does not include a manual reset (MR) input. Unlike MAX6384–MAX6386 and MAX6390 variants, this part is designed exclusively for automatic voltage supervision. Its pinout consists only of VCC, RESET, GND, and RESET IN - with no dedicated MR terminal. If manual reset capability is required, consider MAX6385XS45D1+T (same threshold/timing, 4-pin SC70, with MR input) or MAX6390XS45D4+T (dual-timing variant with MR).

How does the RESET IN feature work on MAX6388XS45D1+T and what external components are needed?

The RESET IN pin on MAX6388XS45D1+T connects to an internal 1.27V comparator reference. To supervise a secondary voltage (e.g., 3.3V), use a resistor divider: R1 from the target rail to RESET IN, R2 from RESET IN to GND. The threshold is calculated as V_TH = 1.27V × (R1/R2 + 1). For a 3.3V rail, R1 = 158kΩ and R2 = 100kΩ yields ~3.30V trip point. No active components are required - only two precision resistors - enabling dual-rail supervision with zero additional ICs.

What is the supply current consumption of MAX6388XS45D1+T at different operating voltages?

MAX6388XS45D1+T draws 3μA typical at +1.8V, 4μA at +2.5V, 6μA at +3.6V, and 7μA at +5.5V (no load, +25°C). These values remain stable across -40°C to +125°C, with less than 10% variation. The ultra-low current at 1.8V makes MAX6388XS45D1+T ideal for battery-powered devices where multi-year operation is required, such as wireless sensors or portable medical monitors.

Is MAX6388XS45D1+T pin-compatible with other members of the MAX6381–MAX6390 family?

Yes, MAX6388XS45D1+T shares the same 4-pin SC70 pinout (VCC, RESET, GND, RESET IN) with MAX6387XSxxDx+T and MAX6389XSxxDx+T. However, it is not pin-compatible with MAX6384–MAX6386 (which substitute MR for RESET IN) or MAX6381–MAX6383 (3-pin SC70). All 4-pin SC70 variants use identical land pattern 90-0187, enabling layout reuse across supervision configurations when RESET IN is required.