SN54LS109AJ datasheet by Texas Instruments

SN54LS109AJ Frequently Asked Questions (FAQs)

• What is the recommended operating voltage range for the SN54LS109AJ?
  The recommended operating voltage range for the SN54LS109AJ is 4.75V to 5.25V, as specified in the datasheet. However, it's recommended to operate the device at a stable 5V supply to ensure reliable operation.
• How do I handle the propagation delay of the SN54LS109AJ?
  The propagation delay of the SN54LS109AJ is typically around 10-15 ns. To handle this, ensure that your system design takes into account the delay and allows for sufficient setup and hold times for the input signals.
• Can I use the SN54LS109AJ in a 3.3V system?
  No, the SN54LS109AJ is not designed to operate at 3.3V. It's a 5V device, and operating it at 3.3V may result in unreliable operation or damage to the device.
• How do I ensure the SN54LS109AJ is properly terminated?
  The SN54LS109AJ has open-collector outputs, which require external pull-up resistors to ensure proper operation. The recommended pull-up resistor value is typically in the range of 1kΩ to 4.7kΩ, depending on the system requirements.
• Is the SN54LS109AJ compatible with TTL logic levels?
  Yes, the SN54LS109AJ is designed to be compatible with TTL (Transistor-Transistor Logic) logic levels. It can be used in systems that operate with TTL logic levels.