74AC157TTR datasheet by STMicroelectronics

74AC157TTR Frequently Asked Questions (FAQs)

• What is the maximum operating frequency of the 74AC157TTR?
  The maximum operating frequency of the 74AC157TTR is typically around 100 MHz, but it can vary depending on the specific application and operating conditions.
• How do I ensure signal integrity when using the 74AC157TTR?
  To ensure signal integrity, it's essential to follow proper PCB design practices, such as using controlled impedance traces, minimizing signal routing distances, and providing adequate decoupling capacitors.
• Can I use the 74AC157TTR in a 3.3V system?
  Yes, the 74AC157TTR is compatible with 3.3V systems, but it's essential to ensure that the input signals are within the recommended voltage range (VCC-0.5V to VCC+0.5V) to maintain proper operation.
• How do I handle power sequencing when using the 74AC157TTR?
  It's recommended to sequence the power supply to the 74AC157TTR such that the VCC supply is applied before the input signals, and the input signals are only applied after VCC has reached a stable level.
• What is the recommended termination scheme for the 74AC157TTR?
  The recommended termination scheme for the 74AC157TTR is to use a series terminator (e.g., 33Ω) at the far end of the transmission line, and a parallel terminator (e.g., 50Ω) at the near end.