4 TUSB521-Q1 Placement Example

Following the layout guidelines listed in this document enables the TUSB521-Q1 to recover a signal from a USB device up to a typical 14-inch FR4 trace. Keep in mind that the distance after the redriver to the USB-C connector, also known as the post-channel length, needs to be a maximum of 5 inches. These recommended maximum trace lengths assumes the device provides -3dB of de-emphasis and has a compliant receiver that recovers the 20dB loss budgeted by the USBIF for a Type-C cable and the host or device. By adjusting the equalization, de-emphasis, and VOD settings of a device, it is possible to extend the maximum trace lengths available in a system for extended usage. Vice verse, if the signal cannot be recovered with the 20dB loss budget given by the USBIF, then changes are needed to be made to meet this requirement, such as changing placement of the device or adjusting the settings of the device. Any of these changes to the device need to be made only after discussing with the device manufacturer to determine the correct settings.

Figure 4-1 TUSB521-Q1 Placement Design Example