Analog Devices Inc./Maxim Integrated MAX6369KA/V+T

Overview

MAX6369KA/V+T from Maxim Integrated is a pin-selectable watchdog timer IC designed to supervise microprocessor activity in automotive and industrial systems. It features open-drain active-low WDO output with 100ms pulse width, 1ms–60s pin-selectable watchdog timeout and startup delay periods, and operates from +2.5V to +5.5V supply. It is AEC-Q100 qualified and housed in an 8-pin SOT23 package for critical μP monitoring applications.

For engineers reviewing the MAX6369KA/V+T datasheet, MAX6369KA/V+T pinout, MAX6369KA/V+T application, or MAX6369KA/V+T equivalent, key selection criteria include its AEC-Q100 qualification, open-drain 100ms watchdog pulse, pin-selectable timing (no firmware update needed), and operation over –40°C to +125°C for automotive-grade reliability.

Technical Context

The MAX6369KA/V+T implements a precision analog/digital hybrid watchdog timer with three logic-controlled SET pins (SET0–SET2) that configure both startup delay and watchdog timeout independently. Its internal transition detector monitors rising/falling edges on WDI ≥100ns wide, ignoring input during WDO assertion and a 300μs internal setup period after power-up or setting changes.

It uses BiCMOS process technology (1500 transistors) and supports dynamic timing reconfiguration without power cycling. The device enters watchdog disable mode when SET2=HIGH, SET1=LOW, SET0=LOW - resulting in WDO remaining high and no timeout behavior - and resumes operation immediately upon reconfiguration.

Key Specifications

Pinout & Package

Package: 8-pin SOT23 (package code K8SN+1), RoHS-compliant, lead(Pb)-free, footprint per land pattern 90-0176.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar watchdog timer applications.

Compared with MAX6369KA/V+T, MAX6370KA/V+T offers faster reset signaling but loses wired-OR capability, while TPS3808G33DBVR sacrifices configurability, temperature range, and automotive qualification for lower unit cost in non-critical applications.

Availability

MAX6369KA/V+T is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC development, and medical device certification programs requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant parts.

Supply support for MAX6369KA/V+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 MAX6369–MAX6374 family was engineered specifically for high-reliability microprocessor supervision in harsh environments - delivering configurable, low-power, AEC-Q100-qualified watchdog functionality in miniature packages.

FAQ

What is the watchdog output type and pulse width of the MAX6369KA/V+T?

The MAX6369KA/V+T features an open-drain, active-low watchdog output (WDO) with a minimum pulse width of 100ms. This output requires an external pullup resistor (typically 10kΩ) and supports voltage levels up to +5.5V. The 100ms duration ensures reliable detection by downstream reset controllers or interrupt handlers, and is confirmed in the Electrical Characteristics table for MAX6369/MAX6371/MAX6373 variants. The MAX6369KA/V+T belongs to the open-drain subgroup of the family.

Is the MAX6369KA/V+T qualified for automotive applications?

Yes, the MAX6369KA/V+T is AEC-Q100 qualified, as explicitly stated in the Benefits and Features section and Ordering Information. The "/V" suffix denotes automotive qualification, and the device is rated for operation from –40°C to +125°C. This qualification covers stress testing for temperature cycling, humidity, mechanical shock, and ESD - making it suitable for engine control, body electronics, and ADAS subsystems.

How do the SET0, SET1, and SET2 pins configure timing on the MAX6369KA/V+T?

The SET0, SET1, and SET2 pins are logic inputs (tied to VCC or GND) that jointly select both the startup delay and watchdog timeout periods. For the MAX6369KA/V+T, these three pins define eight possible combinations - enabling selection of timing values ranging from 1ms to 60s for both parameters. Table 1 in the datasheet maps each combination to specific min/max values. Unlike MAX6371/MAX6372, the MAX6369KA/V+T allows full pin-selectability for both timing intervals.

Can the MAX6369KA/V+T be disabled without power cycling?

Yes, the MAX6369KA/V+T can be disabled dynamically by setting SET2 = HIGH, SET1 = LOW, and SET0 = LOW. In this configuration, the watchdog timer is halted, and WDO remains continuously high. The device resumes normal operation immediately upon changing the SET pin states to a valid timing configuration, with a 300μs internal setup delay before new timing begins - no power cycle or reset is required.

What is the supply current consumption of the MAX6369KA/V+T?

The MAX6369KA/V+T draws only 8µA typical supply current (ICC) at +25°C with no load, and up to 22µA maximum over the full –40°C to +125°C operating range. This ultra-low quiescent current enables continuous watchdog supervision in battery-backed systems, such as automotive telematics modules or portable medical devices, without compromising runtime or thermal performance.