Product overview
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.
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All features
- 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-pullWDO output
- Operating temperature range: –40 to 125 °C
- Packages: SOT23-5 and SC70-5 (SOT323-5)
- ESD performance
- HBM: 2000 V
- RCDM: 1000 V
- Automotive qualified
Circuit Diagram
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STMicroelectronics - STWD100
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Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| STWD100NPWY3F | Active | SOT23-5L | Industrial | Ecopack3 | |
| STWD100NWWY3F | Active | SOT23-5L | Industrial | Ecopack3 | |
| STWD100NXWY3F | Active | SOT23-5L | Industrial | Ecopack3 | |
| STWD100NYWY3F | Active | SOT23-5L | Industrial | Ecopack3 | |
| STWD100PYW83F | Active | SOT323-5L | Industrial | Ecopack3 | |
| STWD100YNPWY3F | Active | SOT23-5L | Automotive | Ecopack3 | |
| STWD100YNWWY3F | Active | SOT23-5L | Automotive | Ecopack3 | |
| STWD100YNXWY3F | Active | SOT23-5L | Automotive | Ecopack3 | |
| STWD100YNYWY3F | Active | SOT23-5L | Automotive | Ecopack3 |
(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
Sample & Buy
| Part Number | Marketing Status | Budgetary Price (US$)*/Qty | Order from ST | Order from distributors | Package | Packing Type | RoHS | Country of Origin | ECCN (US) | ECCN (EU) | Operating temperature (°C) | Operating Temperature (°C) (max) | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | |||||||||||||
| STWD100YNYWY3F | | | distributors No availability of distributors reported, please contact our sales office | |||||||||||
| STWD100NPWY3F | | | distributors No availability of distributors reported, please contact our sales office | |||||||||||
| STWD100YNWWY3F | | | distributors No availability of distributors reported, please contact our sales office | |||||||||||
| STWD100NWWY3F | | | distributors No availability of distributors reported, please contact our sales office | |||||||||||
| STWD100NYWY3F | | | distributors No availability of distributors reported, please contact our sales office | |||||||||||
| STWD100YNXWY3F | | | distributors No availability of distributors reported, please contact our sales office | |||||||||||
| STWD100PYW83F | | | distributors No availability of distributors reported, please contact our sales office | |||||||||||
| STWD100YNPWY3F | | | distributors No availability of distributors reported, please contact our sales office | |||||||||||
| STWD100NXWY3F | | | distributors No availability of distributors reported, please contact our sales office | |||||||||||
STWD100YNYWY3F Active
STWD100NPWY3F Active
STWD100YNWWY3F Active
STWD100NWWY3F Active
STWD100NYWY3F Active
STWD100YNXWY3F Active
STWD100PYW83F Active
STWD100YNPWY3F Active
STWD100NXWY3F Active
(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors