74HC251D,652 datasheet by NXP Semiconductors

74HC251D,652 Frequently Asked Questions (FAQs)

• What is the maximum frequency of operation for the 74HC251D,652?
  The maximum frequency of operation for the 74HC251D,652 is 30 MHz, but it can vary depending on the supply voltage and load conditions.
• How do I ensure that the 74HC251D,652 is properly powered?
  To ensure proper powering, connect the VCC pin to a stable 2.0 V to 6.0 V power supply, and the GND pin to a solid ground. Also, decouple the power supply with a 0.1 μF capacitor to reduce noise and ensure reliable operation.
• What is the maximum current that the 74HC251D,652 can sink or source?
  The 74HC251D,652 can sink or source up to 25 mA of current per output pin, but it's recommended to limit the current to 10 mA or less to ensure reliable operation and prevent overheating.
• How do I handle the enable inputs (E1 and E2) to ensure proper operation?
  The enable inputs (E1 and E2) are active-low, meaning they must be pulled low to enable the device. Connect them to a logic low (GND) to enable the device, or to a logic high (VCC) to disable it. Use a pull-up or pull-down resistor if the inputs are not driven by a logic signal.
• What is the propagation delay of the 74HC251D,652?
  The propagation delay of the 74HC251D,652 is typically around 10 ns to 20 ns, depending on the supply voltage and temperature. This delay is the time it takes for the output to change state after the input changes.