LM311D datasheet by STMicroelectronics

LM311D Frequently Asked Questions (FAQs)

• What is the maximum voltage that can be applied to the input pins?
  The maximum voltage that can be applied to the input pins is the supply voltage (VCC) + 0.3V. Exceeding this voltage can cause damage to the device.
• How do I ensure stability when using the LM311D as a comparator?
  To ensure stability, a small capacitor (typically 10-100pF) should be connected between the output and the inverting input (pin 2) to prevent oscillations. Additionally, the input signals should be properly filtered and decoupled to prevent noise and oscillations.
• What is the purpose of the strobe input (pin 6) and how do I use it?
  The strobe input (pin 6) is used to latch the output of the comparator. When the strobe input is low, the output is latched and will not change state, even if the input signals change. This can be useful in applications where the output needs to be held steady for a certain period of time.
• Can I use the LM311D as an oscillator?
  Yes, the LM311D can be used as an oscillator, but it's not recommended as it's not designed for this purpose. The device is optimized for comparator applications, and using it as an oscillator may lead to instability and reduced performance.
• What is the maximum frequency of operation for the LM311D?
  The maximum frequency of operation for the LM311D is typically around 50 kHz, but this can vary depending on the specific application and the quality of the input signals.