LM393WDT datasheet by STMicroelectronics

LM393WDT Frequently Asked Questions (FAQs)

• What is the maximum operating temperature range for the LM393WDT?
  The LM393WDT can operate from -40°C to 125°C, but the watchdog timer functionality is only guaranteed to work correctly up to 105°C.
• How do I ensure the watchdog timer is disabled during power-up and reset?
  To disable the watchdog timer during power-up and reset, connect the WDI pin to VCC through a resistor (typically 1 kΩ). This will prevent the watchdog timer from triggering during power-up and reset.
• What is the minimum and maximum timeout period for the watchdog timer?
  The minimum timeout period for the watchdog timer is 3.4 ms, and the maximum timeout period is 2.7 seconds. The timeout period can be adjusted by selecting the appropriate resistor and capacitor values for the oscillator circuit.
• Can I use the LM393WDT as a voltage supervisor?
  Yes, the LM393WDT can be used as a voltage supervisor. The device has a built-in voltage detector that can be used to monitor the supply voltage and generate a reset signal if the voltage falls below a certain threshold.
• How do I calculate the oscillator frequency for the watchdog timer?
  The oscillator frequency for the watchdog timer can be calculated using the following formula: f = 1 / (1.38 * R * C), where R is the resistance value in kΩ and C is the capacitance value in nF.