MAX3421EEHJ+ datasheet by Maxim Integrated Products

MAX3421EEHJ+ Frequently Asked Questions (FAQs)

• What is the maximum cable length supported by the MAX3421EEHJ+?
  The MAX3421EEHJ+ supports cable lengths up to 3 meters (10 feet) for full-speed devices and up to 1.5 meters (5 feet) for low-speed devices.
• How do I implement overcurrent protection with the MAX3421EEHJ+?
  The MAX3421EEHJ+ has an internal overcurrent protection circuit that limits the current to 100mA. You can also add external overcurrent protection using a polyfuse or a current-limiting resistor.
• What is the recommended layout and routing for the MAX3421EEHJ+?
  To minimize electromagnetic interference (EMI) and ensure reliable operation, it is recommended to follow a star-configuration layout, keep the USB traces short and away from noise sources, and use a solid ground plane.
• How do I handle suspend and resume operations with the MAX3421EEHJ+?
  The MAX3421EEHJ+ has a built-in suspend mode that can be enabled by driving the SUSPEND pin low. During suspend, the device enters a low-power state, and the USB transceiver is disabled. To resume, drive the SUSPEND pin high.
• What are the thermal considerations for the MAX3421EEHJ+?
  The MAX3421EEHJ+ has a maximum junction temperature of 150°C. To ensure reliable operation, it is recommended to keep the device temperature below 85°C. Use thermal vias and a heat sink if necessary.