PACUSB-D1 Datasheet, PDF (7/10 Pages) California Micro Devices Corp – USB Downstream Port Terminator

PACUSB-D1/D2/D3
Application Information
The PACUSB-D1/D2/D3 provides a complete interface for a single downstream USB port typically found in
computers and USB hubs. It integrates the series resistors (R1) and the 15kΩ pull-down resistors (R2) for both
USB data lines (D+ and D-) as well as the capacitors to ground for EMI suppression. Zener diodes provide ESD
protection up to 15kV contact discharge per the IEC 61000-4-2 standard and protect the USB controller on both
data lines.
The PACUSB-D1/D2/D3 should be placed on the PCB between the USB controller and the USB connector, as
shown on the Connection Diagram, Figure 5.
Figure 5. Connection Diagram for PACUSB-D1/D2/D3 Devices
To guarantee the best ESD and filtering performance, it is recommended to physically locate the PACUSB-
D1/D2/D3 close to the USB connector. Also, the trace lengths between the PACUSB-D1/D2/D3 and the USB
controller should be kept as short as possible.
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