CD74ACT257E datasheet by Texas Instruments

CD74ACT257E Frequently Asked Questions (FAQs)

• What is the recommended operating voltage range for the CD74ACT257E?
  The recommended operating voltage range for the CD74ACT257E is 4.5V to 5.5V, although it can operate as low as 3.5V with reduced performance.
• How do I ensure signal integrity when using the CD74ACT257E as a quad 2-line to 4-line decoder/demultiplexer?
  To ensure signal integrity, use a low-impedance output driver, keep the output traces short, and use a termination resistor at the receiving end to minimize reflections and ringing.
• What is the maximum frequency of operation for the CD74ACT257E?
  The maximum frequency of operation for the CD74ACT257E is typically around 100 MHz, although this can vary depending on the specific application and operating conditions.
• How do I handle power sequencing when using the CD74ACT257E in a system with multiple power rails?
  To avoid latch-up or other issues, ensure that the VCC pin is powered up before the input signals, and that the input signals are stable before the VCC pin is powered down.
• What is the recommended layout and routing for the CD74ACT257E to minimize noise and EMI?
  Use a star topology for the power and ground connections, keep the input and output traces separate, and use a ground plane to minimize inductive loops and radiation.