SN74LS157D datasheet by Texas Instruments

SN74LS157D Frequently Asked Questions (FAQs)

• What is the maximum frequency of operation for the SN74LS157D?
  The maximum frequency of operation for the SN74LS157D is typically around 30-40 MHz, but this can vary depending on the specific application and operating conditions.
• How do I ensure that the SN74LS157D is properly powered and decoupled?
  To ensure proper operation, the SN74LS157D should be powered from a stable 5V supply, and decoupling capacitors (e.g. 0.1uF) should be placed as close as possible to the device's power pins to filter out noise and reduce electromagnetic interference (EMI).
• What is the maximum current that the SN74LS157D can sink or source?
  The SN74LS157D can sink or source up to 16mA of current per output, but this should be limited to 8mA per output to ensure reliable operation and prevent overheating.
• How do I handle the enable inputs (E1 and E2) when not in use?
  When not in use, the enable inputs (E1 and E2) should be tied to a logic level (either GND or VCC) to prevent floating inputs and ensure proper operation.
• Can I use the SN74LS157D with a 3.3V supply voltage?
  No, the SN74LS157D is designed to operate from a 5V supply voltage, and using a 3.3V supply voltage may not guarantee proper operation or reliability.