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Part Number: MAX6369MAX6374
Description: The MAX6369MAX6374 are pin-selectable watchdog timers that supervise microprocessor (µP) activity and signal when...
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MAX6369MAX6374
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DataSheet
General Description
MAX6369MAX6374 General Description
The MAX6369MAX6374 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 (,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 MAX6369MAX6374 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 watch-
dog timeout period after the initial startup delay.
• Watchdog output/timing options: open drain (100ms)
or push-pull (1ms).
The MAX6369MAX6374 operate over a +2.5V to +5.5V supply range and are available in miniature 8-pin SOT23 packages.
MAX6369MAX6374 Maximum Ratings
Terminal Voltage (with respect to GND)
VCC.....................................................................- 0.3V to +6V
WDI .....................................................................-0.3V to +6V
,WDO (Open Drain: MAX6369/71/73) ................. -0.3V to +6V
,WDO (Push-Pull: MAX6370/72/74 ....... -0.3V to (VCC + 0.3V)
SET0, SET1, SET2 ................................ -0.3V to (VCC + 0.3V)
Maximum Current, Any Pin (input/output)...........................20mA
Continuous Power Dissipation (TA = +70°C)
SOT23-8 (derate 8.75mW/°C above +70°C)............... 700mW
Operating Temperature Range ........................-40°C to +85°C
Storage Temperature Range .........................-65°C to +150°C
Junction Temperature.....................................................+150°C
Lead Temperature (soldering, 10s) ...............................+300°C
VCC Rise or Fall Rate......................................................0.05V/µs
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.
VCC.....................................................................- 0.3V to +6V
WDI .....................................................................-0.3V to +6V
,WDO (Open Drain: MAX6369/71/73) ................. -0.3V to +6V
,WDO (Push-Pull: MAX6370/72/74 ....... -0.3V to (VCC + 0.3V)
SET0, SET1, SET2 ................................ -0.3V to (VCC + 0.3V)
Maximum Current, Any Pin (input/output)...........................20mA
Continuous Power Dissipation (TA = +70°C)
SOT23-8 (derate 8.75mW/°C above +70°C)............... 700mW
Operating Temperature Range ........................-40°C to +85°C
Storage Temperature Range .........................-65°C to +150°C
Junction Temperature.....................................................+150°C
Lead Temperature (soldering, 10s) ...............................+300°C
VCC Rise or Fall Rate......................................................0.05V/µs
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.
MAX6369MAX6374 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
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
MAX6369MAX6374 Typical Application
Embedded Control Systems
Industrial Controllers
Critical µP and Microcontroller (µC) Monitoring
Automotive
Telecommunications
Networking
Industrial Controllers
Critical µP and Microcontroller (µC) Monitoring
Automotive
Telecommunications
Networking
MAX6369MAX6374 Connection Diagram
MAX002
PDF/DataSheet Download
- Datasheet: MAX002
- File Size: 42133 KB
- Manufacturer: FILTRONIC [Filtronic Compound Semiconductors]
- Click here to Download
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