pacusb-u2 California Micro Devices Corporation, pacusb-u2 Datasheet - Page 5

• Manufacturer Part Number: pacusb-u2
• Description: Upstream Usb Port Terminator
• Manufacturer: California Micro Devices Corporation

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 speed is selected by connecting one of the data
lines (D+ or D-) to a 3.3V supply voltage via a 1.5kΩ
pull-up resistor (R2).
© 2006 California Micro Devices Corp. All rights reserved.
05/01/06
The Full Speed signaling bit rate at 12 Mbits per
second, and
The Low Speed signaling bit rate at 1.5 Mbits per
second.
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
CONTROLLER
CONTROLLER
USB
USB
D-
D+
D+
D-
GND
GND
GND
GND
IN1
IN2
IN1
IN2
PACUSB-Ux
PACUSB-Ux
D1_i
GND
D2_i
D1_i
GND
D2_i
1
2
3
1
2
3
Figure 2. Low Speed Connection
Figure 1. Full Speed Connection
C1
C1
C1
C1
●
R1
R1
R1
R1
SC70-6
SC70-6
Tel: [phone]
Connections for Full Speed Operation
Full Speed devices have the pull-up resistor (R2) con-
nected to the D+ data line, as shown in
is tied to the D+ line of the USB controller. Pin 6 is con-
nected to the D+ line on the USB connector.
Connections for Low Speed Operation
Low Speed devices have the pull-up resistor (R2) con-
nected to the D- data line, as shown in
is tied to the D- line of the USB controller; pin 6 is con-
nected to the D- line on the USB connector.
R2
R2
●
D1_c
V
D2_c
D1_c
V
D2_c
3.3
6
4
5
6
3.3
4
5
Fax: [phone]
OUT 1
OUT 2
Vcc
OUT 1
OUT 2
Vcc
PACUSB-U1/U2/U3
3.3V
3.3V
D-
D+
D+
D-
CONNECTOR
CONNECTOR
●
USB
USB
www.cmd.com
Figure
Figure
2. Pin 1
1. Pin1
5