SN74HC257D datasheet by Texas Instruments

SN74HC257D Frequently Asked Questions (FAQs)

• What is the maximum frequency of operation for the SN74HC257D?
  The maximum frequency of operation for the SN74HC257D is typically 40 MHz, but it can vary depending on the specific application and operating conditions.
• How do I ensure that the SN74HC257D is properly powered?
  To ensure proper operation, the SN74HC257D requires a stable power supply voltage (VCC) between 2 and 6 volts, with a recommended operating voltage of 5 volts. Additionally, decoupling capacitors should be used to filter out noise and ensure stable operation.
• What is the propagation delay time for the SN74HC257D?
  The propagation delay time for the SN74HC257D is typically around 10-15 ns, but this can vary depending on the specific application and operating conditions.
• Can I use the SN74HC257D as a demultiplexer?
  Yes, the SN74HC257D can be used as a demultiplexer by connecting the output enable (OE) input to the select input (S) and using the output (Y) as the demultiplexed output.
• How do I handle the enable input (E) on the SN74HC257D?
  The enable input (E) is an active-low input, meaning that the device is enabled when E is low (logic 0) and disabled when E is high (logic 1). When E is high, the outputs are in a high-impedance state.