MAX6373KA
MAX6373KA Datasheet
MAX6369KA-T -40°C to +85°C 8 SOT23-8 AADC
| Part | Datasheet |
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MAX6373KA |
MAX6373KA (pdf) |
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MAX6369KA |
MAX6369KA |
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| Pin-Selectable Watchdog Timers The 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 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 operate over a +2.5V to +5.5V supply range and are available in miniature 8-pin SOT23 packages. Embedded Control Systems Industrial Controllers Critical µP and Microcontroller µC Monitoring Automotive Telecommunications Networking o Precision Watchdog Timer for Critical µP Applications o Pin-Selectable Watchdog Timeout Periods o Pin-Selectable Watchdog Startup Delay Periods o Ability to Change Watchdog Timing Characteristics Without Power Cycling o Open-Drain or Push-Pull Pulsed Active-Low Watchdog Output o Watchdog Timer Disable Feature o +2.5V to +5.5V Operating Voltage o 8µA Low Supply Current o No External Components Required o Miniature 8-Pin SOT23 Package Ordering Information PART TEMP RANGE PIN- PACKAGE MARKS MAX6369KA-T -40°C to +85°C 8 SOT23-8 AADC MAX6370KA-T -40°C to +85°C 8 SOT23-8 AADD MAX6371KA-T -40°C to +85°C 8 SOT23-8 AADE MAX6372KA-T MAX6373KA-T -40°C to +85°C 8 SOT23-8 -40°C to +85°C 8 SOT23-8 AADF AADG MAX6374KA-T -40°C to +85°C 8 SOT23-8 AADH Note All devices are available in tape-and-reel only. Required order increment is 2,500 pieces. Pin Configuration appears at end of data sheet. Selector Guide PART MAX6369 MAX6370 MAX6371 MAX6372 MAX6373 MAX6374 OUTPUT Open Drain Push-Pull Open Drain Push-Pull Open Drain Push-Pull WDO PULSE WIDTH ms 100 1 100 1 100 1 MINIMUM STARTUP DELAY MINIMUM WATCHDOG TIMEOUT Selectable 1ms to 60s Selectable 1ms to 60s Selectable 200µs to 60s or first edge Selectable 200µs to 60s or first edge Selectable 1ms to 60s Selectable 1ms to 60s Selectable 1ms to 60s Selectable 1ms to 60s Selectable 30µs to 10s Selectable 30µs to 10s Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at Pin-Selectable Watchdog Timers ABSOLUTE MAXIMUM RATINGS Terminal Voltage with respect to GND VCC to +6V 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 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 Lead Temperature soldering, 10s .................................+300°C VCC Rise or Fall 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. ELECTRICAL CHARACTERISTICS VCC = +2.5V to +5.5V, SET_ = VCC or GND, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C and VCC = +3V. Note 1 PARAMETER Operating Voltage Range Supply Current Input High Voltage Input Low Voltage Logic Input Current Note 2 WDO Output Low Voltage SYMBOL VCC ICC VIH VIL CONDITIONS No load WDI, SET0, SET1, SET2 WDI, SET0, SET1, SET2 VCC 3.3V VCC 2.5V WDI or SET_ = 0 or VCC ISINK = 1.2mA, VCC > 2.7V, watchdog output asserted ISINK = 6mA, VCC > 4.5V, watchdog output asserted x VCC TYP 8 MAX 20 ±10 UNITS V µA V WDO Leakage Current ILKG V NDO = 0 to +5.5V, output deasserted, MAX6369/MAX6371/MAX6373 WDO Output High Voltage MAX6369/MAX6370 Startup Delay Period ISOURCE = 500µA, VCC > 2.7V, watchdog output deasserted x VCC ISOURCE = 800µA, VCC > 4.5V, watchdog output deasserted VCC - tDELAY SET2 = 0, SET1 = 0, SET0 = 0 SET2 = 0, SET1 = 0, SET0 = VCC SET2 = 0, SET1 = VCC, SET0 = 0 SET2 = 0, SET1 = VCC, SET0 = VCC SET2 = VCC, SET1 = 0, SET0 = 0 SET2 = VCC, SET1 = 0, SET0 = VCC SET2 = VCC, SET1 = VCC, SET0 = 0 SET2 = VCC, SET1 = VCC, SET0 = VCC Watchdog Disabled Pin-Selectable Watchdog Timers |
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