CD74HC4515EN datasheet by Texas Instruments

CD74HC4515EN Frequently Asked Questions (FAQs)

• What is the maximum clock frequency for the CD74HC4515EN?
  The maximum clock frequency for the CD74HC4515EN is 25 MHz, but it can operate up to 40 MHz with a reduced voltage supply (VCC) of 4.5V.
• How do I ensure proper signal integrity and reduce noise in my design?
  To ensure proper signal integrity and reduce noise, use a low-impedance output driver, keep signal traces short, and use a ground plane to reduce electromagnetic interference (EMI). Additionally, consider using a series resistor and a bypass capacitor to filter out high-frequency noise.
• What is the recommended operating voltage range for the CD74HC4515EN?
  The recommended operating voltage range for the CD74HC4515EN is 2V to 6V, with a typical voltage of 5V. Operating the device outside this range may affect its performance and reliability.
• How do I handle the asynchronous reset (RST) input?
  The asynchronous reset (RST) input should be tied to VCC through a pull-up resistor (e.g., 1 kΩ) to ensure the device is properly reset. A low-level input on RST will reset the device, and a high-level input will allow normal operation.
• What is the purpose of the LE (Latch Enable) input?
  The LE (Latch Enable) input is used to latch the data present on the A0-A3 inputs into the internal registers. When LE is high, the data is latched, and when LE is low, the data is not latched.