PACUSBD Datasheet, PDF (6/8 Pages) ON Semiconductor – USB Downstream Port Terminator

PACUSBD
APPLICATION INFORMATION
The PACUSB−D1/D2 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 15 kW 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 15 kV contact discharge
per the IEC 61000−4−2 standard and protect the USB controller on both data lines.
The PACUSB−D1/D2 should be placed on the PCB between the USB controller and the USB connector, as shown on the
Connection Diagram, Figure 4.
D+
USB
Controller
PACUSB−D1Y5R, −DnYB5R
R1
1
C1
R2
2
C1
R2
5
D+
Downstream
USB
Connector
D−
3
4
D−
R1
Figure 4. Connection Diagram for PACUSB−D1/D2 Devices
To guarantee the best ESD and filtering performance, it is recommended to physically locate the PACUSB−D1/D2 close to
the USB connector. Also, the trace lengths between the PACUSB−D1/D2 and the USB controller should be kept as short as
possible.
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