SN74LS155AD datasheet by Texas Instruments

SN74LS155AD Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that the SN74LS155AD can handle?
  The maximum clock frequency of the SN74LS155AD is 35 MHz, but it can vary depending on the specific application and operating conditions.
• How do I ensure that the SN74LS155AD is properly powered and decoupled?
  To ensure proper power and decoupling, use a 5V power supply, add a 0.1uF ceramic capacitor between VCC and GND, and use a 10uF electrolytic capacitor between VCC and GND for bulk decoupling.
• What is the maximum current that the SN74LS155AD can sink or source?
  The SN74LS155AD can sink up to 24mA and source up to 12mA per output, but it's recommended to limit the current to 8mA per output to ensure reliable operation.
• How do I handle the asynchronous reset input (CLR) of the SN74LS155AD?
  The CLR input should be tied to VCC through a 1kΩ resistor and a 0.01uF capacitor to ensure proper reset operation. The CLR input should be driven low for at least 10ns to ensure a proper reset.
• What is the propagation delay of the SN74LS155AD?
  The propagation delay of the SN74LS155AD is typically around 10ns, but it can vary depending on the specific application and operating conditions.