STWD100NXWY3F Timers & Support Products Watchdog timer circuit
♠ Product Description
| Product Attribute | Attribute Value |
| Manufacturer: | STMicroelectronics |
| Product Category: | Timers & Support Products |
| RoHS: | Details |
| Series: | STWD100 |
| Number of Internal Timers: | 1 Timer |
| Supply Voltage - Max: | 5.5 V |
| Supply Voltage - Min: | 2.7 V |
| Minimum Operating Temperature: | - 40 C |
| Maximum Operating Temperature: | + 125 C |
| Mounting Style: | SMD/SMT |
| Package / Case: | SOT-23-5 |
| Packaging: | Reel |
| Packaging: | Cut Tape |
| Packaging: | MouseReel |
| Brand: | STMicroelectronics |
| Operating Supply Current: | 13 uA |
| Output Type: | Open Drain / Open Collector |
| Pd - Power Dissipation: | 320 mW |
| Product: | Timers |
| Product Type: | Timers & Support Products |
| Shutdown: | No Shutdown |
| Factory Pack Quantity: | 3000 |
| Subcategory: | Clock & Timer ICs |
| Supply Type: | Single |
| Unit Weight: | 0.000578 oz |
♠ Watchdog timer circuit
Description The STWD100 watchdog timer circuits are self-contained devices which prevent system failures that are caused by certain types of hardware errors (such as, non-responding peripherals and bus contention) or software errors (such as a bad code jump and a code stuck in loop).
The STWD100 watchdog timer has an input, WDI, and an output, WDO . The input is used to clear the internal watchdog timer periodically within the specified timeout period, twd. While the system is operating correctly, it periodically toggles the watchdog input, WDI. If the system fails, the watchdog timer is not reset, a system alert is generated and the watchdog output, WDO , is asserted.
The STWD100 circuit also has an enable pin, EN , which can enable or disable the watchdog functionality. The EN pin is connected to the internal pull-down resistor. The device is enabled if the EN pin is left floating
• Current consumption 13 µA typ.
• Available watchdog timeout periods are 3.4 ms, 6.3 ms, 102 ms, and 1.6 s
• Chip enable input
• Open drain or push-pull WDO output
• Operating temperature range: –40 to 125 °C
• Packages: SOT23-5 and SC70-5 (SOT323-5)
• ESD performance
– HBM: 2000 V
– CDM: 1000 V
• Automotive qualified
• Telecommunications
• Alarm systems
• Industrial equipment
• Networking
• Medical equipment
• UPS (uninterruptible power supply)
• Automotive
