Analog Devices Inc./Maxim Integrated MAX6360LSUT+T

Overview

The MAX6360LSUT+T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with active-low push-pull reset output referenced to VCC2, factory-set VCC1 threshold of 4.63V and VCC2 threshold of 2.93V, 20µA supply current, and integrated watchdog timer featuring 46.4s startup and 2.9s normal timeout periods-used in multivoltage embedded systems requiring reliable power-on reset and processor activity monitoring.

For engineers reviewing the MAX6360LSUT+T datasheet, MAX6360LSUT+T pinout, MAX6360LSUT+T application, or MAX6360LSUT+T equivalent, key selection criteria include dual-supply reset assertion logic, guaranteed RESET validity down to VCC2 = 1V, watchdog timeout timing modes, SOT23-6 package compatibility, and voltage threshold accuracy over -40°C to +85°C.

Technical Context

The MAX6360LSUT+T implements independent precision voltage comparators for VCC1 and VCC2, asserting reset whenever either supply drops below its factory-trimmed threshold (4.63V/2.93V). Its watchdog timer operates in two distinct modes: a 46.4s startup timeout after power-up or reset, followed by a 2.9s normal timeout requiring periodic WDI transitions.

Reset outputs are push-pull and referenced exclusively to VCC2, ensuring valid logic levels even when VCC1 falls below 1V-as long as VCC2 remains ≥1V. The device guarantees 100ms minimum reset pulse width and supports debounced TTL/CMOS manual reset input with sub-microsecond response.

Key Specifications

Pinout & Package

MAX6360LSUT+T is housed in a lead(Pb)-free 6-pin SOT23 package (U6-1 outline), with 0.95mm pitch, 2.9mm × 1.6mm body, and thermal pad not connected internally.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-voltage supervisory applications.

Compared with MAX6360LTUT+T, the MAX6360LSUT+T provides higher VCC1 trip point for robust +5V rail supervision; versus TPS3808G33DBVR, it delivers essential dual-rail coordination and processor watchdog enforcement absent in single-supply alternatives.

Availability

MAX6360LSUT+T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical diagnostics, automotive infotainment head units, and networked industrial sensors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX6360LSUT+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 industrial, automotive, communications, and computing applications.

The MAX6351–MAX6360 family delivers dual- and triple-voltage microprocessor supervisors optimized for multirail embedded systems needing coordinated reset generation, brownout immunity, and firmware watchdog assurance.

FAQ

What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6360LSUT+T?

The MAX6360LSUT+T has a factory-set VCC1 threshold of 4.63V (±0.09V at +25°C) and VCC2 threshold of 2.93V (±0.05V at +25°C), as defined by the "LS" suffix per Maxim's Voltage Threshold Levels table. These values are trimmed during production and guaranteed over -40°C to +85°C operation. The MAX6360LSUT+T uses these precise thresholds to assert reset when either monitored supply falls below its respective trip point.

Does the MAX6360LSUT+T provide a reset output referenced to VCC1 or VCC2?

The MAX6360LSUT+T provides a single active-low push-pull reset output (RST2) referenced to VCC2, as confirmed by the Pin Description table and Functional Diagram. Unlike the MAX6351 or MAX6359, it does not offer VCC1-referenced output. This design ensures RST2 remains valid as long as VCC2 ≥ 1.0V, making it ideal for systems where the secondary supply powers critical reset receivers.

How does the watchdog timer on the MAX6360LSUT+T operate during system startup?

The MAX6360LSUT+T watchdog timer initiates a 46.4s startup timeout period after any reset event (power-up, MR assertion, or watchdog timeout). During this interval, no WDI transitions are required, allowing full system initialization. Once the startup period expires-or upon the first valid WDI edge before expiry-the timer switches to 2.9s normal timeout mode. This dual-mode behavior is intrinsic to the MAX6360LSUT+T and prevents false resets during boot.

Can the MAX6360LSUT+T monitor three voltage rails?

No, the MAX6360LSUT+T monitors exactly two voltage rails: VCC1 and VCC2. It lacks the RSTIN input found on MAX6355/MAX6356/MAX6357 variants, which enables third-rail monitoring via an external resistive divider. The MAX6360LSUT+T's pinout (VCC1, VCC2, GND, MR, RST2, WDI) confirms dual-supply functionality only. For triple-voltage supervision, select MAX6356LTUT+T or MAX6357LTUT+T instead.

What is the minimum supply voltage required for the MAX6360LSUT+T to maintain valid reset output?

The MAX6360LSUT+T guarantees valid RST2 output as long as either VCC1 or VCC2 remains above +1.0V, per Absolute Maximum Ratings and Electrical Characteristics. Specifically, RST2 remains functional down to VCC2 = 1.0V (since RST2 is VCC2-referenced), enabling controlled shutdown sequencing during brownout conditions. This specification is tested and guaranteed across the full -40°C to +85°C temperature range for the MAX6360LSUT+T.