SN74LS174DR datasheet by Texas Instruments

SN74LS174DR Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that the SN74LS174DR can handle?
  The maximum clock frequency of the SN74LS174DR is 25 MHz, but it can vary depending on the specific application and operating conditions.
• How do I ensure that the SN74LS174DR is properly powered and decoupled?
  To ensure proper power and decoupling, use a 5V power supply, add a 0.1uF decoupling capacitor between VCC and GND, and use a 10uF bulk capacitor for each 10 ICs on the board.
• What is the maximum current that the SN74LS174DR can sink or source?
  The SN74LS174DR can sink up to 16mA 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 clear (CLR) input?
  The CLR input should be tied to VCC through a 1kΩ resistor to ensure that the flip-flops are properly cleared during power-up. A capacitor can also be added to filter out noise.
• What is the recommended layout and routing for the SN74LS174DR?
  Use a star topology for power and ground connections, keep signal traces short and away from noise sources, and use a ground plane to reduce noise and EMI.