CY7B991-7JI datasheet by Cypress Semiconductor

CY7B991-7JI Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that can be used with CY7B991-7JI?
  The maximum clock frequency for CY7B991-7JI is 200 MHz. However, it's recommended to check the specific application and system requirements to ensure the clock frequency is within the recommended range.
• How do I implement clock domain crossing (CDC) with CY7B991-7JI?
  Cypress provides a Clock Domain Crossing (CDC) application note (AN54445) that provides guidelines and examples for implementing CDC with CY7B991-7JI. It's recommended to follow the guidelines and use the provided IP cores to ensure proper CDC implementation.
• What is the recommended termination scheme for CY7B991-7JI?
  The recommended termination scheme for CY7B991-7JI is to use a 50-ohm series resistor at the transmitter and a 50-ohm parallel terminator at the receiver. This scheme provides the best signal integrity and minimizes reflections.
• Can I use CY7B991-7JI in a PCIe application?
  Yes, CY7B991-7JI can be used in a PCIe application. However, it's essential to ensure that the device is configured correctly and meets the PCIe specification requirements. Cypress provides a PCIe application note (AN54446) that provides guidelines and examples for using CY7B991-7JI in PCIe applications.
• How do I handle power-up and power-down sequencing with CY7B991-7JI?
  Cypress recommends following a specific power-up and power-down sequencing to ensure proper device operation. The recommended sequence is to power up the VCCO and VCCA supplies simultaneously, followed by the VCCP supply. During power-down, the sequence should be reversed. It's essential to follow the recommended sequence to prevent device damage or malfunction.