SN74HC251D datasheet by Texas Instruments

SN74HC251D Frequently Asked Questions (FAQs)

• What is the maximum frequency of operation for the SN74HC251D?
  The maximum frequency of operation for the SN74HC251D is 40 MHz.
• Can I use the SN74HC251D in a 5V system?
  Yes, the SN74HC251D is compatible with 5V systems, but it's recommended to use a voltage regulator to ensure a stable 5V supply.
• 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 high (VCC) to prevent unwanted switching.
• What is the propagation delay of the SN74HC251D?
  The propagation delay of the SN74HC251D is approximately 10 ns (typical) at 25°C and 5V supply voltage.
• Can I use the SN74HC251D in a 3.3V system?
  Yes, the SN74HC251D is compatible with 3.3V systems, but the output voltage will be limited to 3.3V, and the input voltage threshold may be affected.