Click here for production status of specific part numbers. MAX6369MAX6374 Pin-Selectable Watchdog Timers General Description Benefits and Features The MAX6369MAX6374 are pin-selectable watchdog Precision Watchdog Timer for Critical P Applications timers that supervise microprocessor (P) activity and Pin-Selectable Watchdog Timeout Periods signal when a system is operating improperly. During Pin-Selectable Watchdog Startup Delay Periods normal operation, the microprocessor should repeatedly toggle the watchdog input (WDI) before the selected Ability to Change Watchdog Timing Characteristics Without Power Cycling watchdog timeout period elapses to demonstrate that the system is processing code properly. If the P does Open-Drain or Push-Pull Pulsed Active-Low not provide a valid watchdog input transition before the Watchdog Output timeout period expires, the supervisor asserts a watchdog Watchdog Timer Disable Feature (WDO) output to signal that the system is not executing +2.5V to +5.5V Operating Voltage the desired instructions within the expected time frame. The watchdog output pulse can be used to reset the P or 8A Low Supply Current interrupt the system to warn of processing errors. No External Components Required The MAX6369MAX6374 are flexible watchdog timer Miniature 8-Pin SOT23 Package supervisors that can increase system reliability through AEC-Q100 Qualified (MAX6369KA/V+ and notification of code execution errors. The family offers MAX6374KA/V+ Only) several pin-selectable watchdog timing options to match a wide range of system timing applications: Applications Watchdog startup delay: provides an initial delay Embedded Control Systems before the watchdog timer is started. Industrial Controllers Watchdog timeout period: normal operating watchdog Critical P and Microcontroller (C) Monitoring timeout period after the initial startup delay. Automotive Watchdog output/timing options: open drain (100ms) Telecommunications or push-pull (1ms). Networking The MAX6369MAX6374 operate over a +2.5V to +5.5V supply range and are available in miniature 8-pin SOT23 packages. Functional Diagram V WDI CC MAX6369MAX6374 TRANSITION EN DETECTOR SET 2 CLEAR CONTROL SET 1 LOGIC ENABLE SET 0 SET WATCHDOG TIMEOUT WDO OUT OUTPUT SET STARTUP DELAY WATCHDOG TIMER CIRCUITRY GND 19-1676 Rev 9 3/19MAX6369MAX6374 Pin-Selectable Watchdog Timers Absolute Maximum Ratings Terminal Voltage (with respect to GND) Continuous Power Dissipation (T = +70C) A V ......................................................................-0.3V to +6V 8-Pin SOT23 (derate 5.6mW/C above +70C) .......444.4mW CC WDI ......................................................................-0.3V to +6V Operating Temperature Range ......................... -40C to +125C WDO (Open Drain: MAX6369/71/73) ..................-0.3V to +6V Storage Temperature Range ............................ -65C to +150C WDO (Push-Pull: MAX6370/72/74 ....... -0.3V to (V + 0.3V) Junction Temperature ......................................................+150C CC SET0, SET1, SET2............................... -0.3V to (V + 0.3V) V Rise or Fall Rate ...................................................0.05V/s CC CC Maximum Current, Any Pin (input/output) ..........................20mA Lead Temperature (soldering, 10s) .................................+300C Soldering Temperature (reflow) Lead(Pb)-free ..................................................................+260C Containing Lead (Pb) ......................................................+240C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Package Information 8 SOT23 PACKAGE CODE K8SN-1/K8SN+1 Outline Number 21-0078 Land Pattern Number 90-0176 Thermal Resistance, Single-Layer Board: Junction to Ambient ( ) N/A JA Junction to Case ( ) 80C/W JC Thermal Resistance, Multi-Layer Board: Junction to Ambient ( ) 180C/W JA Junction to Case ( ) 60C/W JC For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a +, , or - in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. Maxim Integrated 2 www.maximintegrated.com