SN74LS157DR datasheet by Texas Instruments

SN74LS157DR Frequently Asked Questions (FAQs)

• What is the maximum frequency of operation for the SN74LS157DR?
  The maximum frequency of operation for the SN74LS157DR is typically around 30-40 MHz, but this can vary depending on the specific application and operating conditions.
• How do I ensure that the SN74LS157DR is properly powered and decoupled?
  To ensure proper operation, the SN74LS157DR 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 SN74LS157DR can sink or source?
  The SN74LS157DR can sink or source up to 16mA of current per output, but this should be limited to 8mA per output to ensure reliable operation.
• How do I handle the enable inputs (E1 and E2) to ensure proper operation?
  The enable inputs (E1 and E2) should be driven with a logic signal (0 or 5V) to enable or disable the multiplexer. When the enable input is low (0V), the output is in a high-impedance state.
• What is the propagation delay of the SN74LS157DR?
  The propagation delay of the SN74LS157DR is typically around 10-15ns, but this can vary depending on the specific application and operating conditions.