SN54LS138J datasheet by Texas Instruments

SN54LS138J Frequently Asked Questions (FAQs)

• What is the maximum frequency of operation for the SN54LS138J?
  The maximum frequency of operation for the SN54LS138J is typically around 25-30 MHz, but this can vary depending on the specific application and operating conditions.
• How do I ensure that the SN54LS138J is properly powered and decoupled?
  To ensure proper operation, the SN54LS138J should be powered with a stable 5V supply, and decoupling capacitors (e.g. 0.1uF and 10uF) should be placed close to the device to filter out noise and reduce electromagnetic interference (EMI).
• What is the maximum current that the SN54LS138J can sink or source?
  The SN54LS138J can sink up to 24mA and source up to 12mA per output, but this can vary depending on the specific application and operating conditions.
• How do I handle the enable inputs (E1, E2, E3) to ensure proper operation?
  The enable inputs (E1, E2, E3) should be tied to a valid logic level (either VCC or GND) to ensure proper operation. Leaving these inputs floating can cause unpredictable behavior.
• What is the propagation delay of the SN54LS138J?
  The propagation delay of the SN54LS138J is typically around 10-15ns, but this can vary depending on the specific application and operating conditions.