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MAX6370

Pin-Selectable Watchdog Timers

Please check latest availability status for a specific part variant.

Overview

Description

The MAX6369–MAX6374 are pin-selectable watchdog timers that supervise microprocessor (µP) activity and signal when a system is operating improperly. During normal operation, the microprocessor should repeatedly toggle the watchdog input (WDI) before the selected watchdog timeout period elapses to demonstrate that the system is processing code properly. If the µP does not provide a valid watchdog input transition before the timeout period expires, the supervisor asserts a watchdog (active-low WDO) output to signal that the system is not executing the desired instructions within the expected time frame. The watchdog output pulse can be used to reset the µP or interrupt the system to warn of processing errors.

The MAX6369–MAX6374 are flexible watchdog timer supervisors that can increase system reliability through notification of code execution errors. The family offers several pin-selectable watchdog timing options to match a wide range of system timing applications:

Watchdog startup delay: provides an initial delay before the watchdog timer is started.
Watchdog timeout period: normal operating watchdog timeout period after the initial startup delay.
Watchdog output/timing options: open drain (100ms) or push-pull (1ms).

The MAX6369-MAX6374 operate over a +2.5V to +5.5V supply range and are available in miniature 8-pin SOT23 packages.

MAX6369, MAX6370, MAX6371, MAX6372, MAX6373, MAX6374: Functional Diagram

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Key Features

Precision Watchdog Timer for Critical µP Applications
Pin-Selectable Watchdog Timeout Periods
Pin-Selectable Watchdog Startup Delay Periods
Ability to Change Watchdog Timing Characteristics Without Power Cycling
Open-Drain or Push-Pull Pulsed Active-Low Watchdog Output
Watchdog Timer Disable Feature
+2.5V to +5.5V Operating Voltage
8µA Low Supply Current
No External Components Required
Miniature 8-Pin SOT23 Package
AEC-Q100 Qualified (MAX6369KA/V+ and MAX6374KA/V+ Only)

Applications/Uses

Automotive
Critical µP and Microcontroller (µC) Monitoring
Embedded Control Systems
Industrial Controllers
Networking
Telecommunications

Parametric Specs

Part Number

Watchdog Feature

Watchdog Timeout

Watchdog Startup Delay

Watchdog Output

I_CC
(µA)

Package/Pins

Oper. Temp.
(°C)

Budgetary
Price

min

max

See Notes

MAX6369

Input (WDI)

Input/Output (WDI/WDO)

Pin Selectable

Watchdog Only

1s to 2s

<1s

>2s

Adjustable

<60s

Open-Drain

SOT23/8

-40 to +85

0 to +70

$1.72 @1k

MAX6370

<60s

Push-Pull

SOT23/8

MAX6371

60s

Open-Drain

SOT23/8

MAX6372

60s

Push-Pull

SOT23/8

MAX6373

>60s

Open-Drain

SOT23/8

MAX6374

>60s

Push-Pull

SOT23/8

See All Watchdog Timers (10)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources

Technical Documents

App Note 1865 Different Ways to Use a MAX6369 Series Watchdog Timer

Quality and Environmental Data

Product Reliability Reports: MAX6370.pdf
Lead-Free Package Tin (Sn) Whisker Reports

Additional Resources

Breakout/Adapter Boards: SOT-23-5

Powering Through Faults on the Smart Grid

Tools & Models

MAX6370 IBIS Model

CAD Symbols and Footprints

MAX6370KA+

MAX6370KA+T

MAX6370KA-T

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Quality And Environmental

Device	Fab Process	Technology	Sample size	Rejects	FIT at 25°C	FIT at 55°C

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >