PACUSB-U2 datasheet(5/9 Pages) ONSEMI

5 / 9 page

PACUSB-U1/U2/U3

Rev. 2 | Page 5 of 9 | www.onsemi.com

Application Information

The PACUSB-U1/U2/U3 is targeted for upstream USB ports (peripherals). It provides series termination, EMI

filtering, and ESD protection for the two USB data lines D+ and D-.

The USB Specification revision 1.1 provides for two data rates:

•

The Full Speed signaling bit rate at 12 Mbits per second, and

•

The Low Speed signaling bit rate at 1.5 Mbits per second.

The speed is selected by connecting one of the data lines (D+ or D-) to a 3.3V supply voltage via a 1.5k

Ω pull-

up resistor (R2).

Connections for Full Speed Operation

Full Speed devices have the pull-up resistor (R2) connected to the D+ data line, as shown in Full

Speed

Connection. Pin1 is tied to the D+ line of the USB controller. Pin 6 is connected to the D+ line on the USB

connector.

Connections for Low Speed Operation

Low Speed devices have the pull-up resistor (R2) connected to the D- data line, as shown in Low

Speed

Connection. Pin 1 is tied to the D- line of the USB controller; pin 6 is connected to the D- line on the USB

connector.

Figure 1. Full Speed Connection

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