PACUSB-U1 Datasheet, PDF (1/7 Pages) California Micro Devices Corp – Upstream USB Port Terminator

PACUSB-U1/U2/U3
Upstream USB Port Terminator
Features
• One upstream USB port terminator, EMI filter and
transient overvoltage protector in a single surface-
mount package
• Compact SC70 or SOT23 package saves board
space and lowers manufacturing costs compared
to discrete solutions
• ESD protection to ±30kV contact discharge per
MIL-STD-883D, method 3015
• ESD protection to ±15kV contact discharge per
IEC 61000-4-2 international standard
• Lead-free version available
Applications
• ESD protection and termination of USB port
• All USB peripherals (PC printers, scanners,
zip drives, etc.)
• PDAs / handheld PCs
• Digital cameras
• Wireless Handets
• MP3 Players
• Cable Modems
Product Description
The PACUSB-U1, PACUSB-U2, and PACUSB-U3 are
single-channel USB upstream-port termination net-
works.
The PACUSB-U1/U2/U3 integrate EMI/RFI filter com-
ponents R1 and C1, as recommended by the USB
specification. Because these are upstream USB
devices, they are terminated with a single 1.5kΩ pull-up
resistor to V_3.3 (R2).
There are three options for the value of the series
resistor R1:
• For PACUSB-U1, R1=15Ω
• For PACUSB-U2, R1=33Ω
• For PACUSB-U3, R1=22Ω
This series resistance plus the USB driver output resis-
tance must be close to the USB cable’s characteristic
impedance of 45Ω (90Ω balanced) to minimize trans-
mission line reflections.
In addition, these parts provide a very high level of pro-
tection for sensitive electronic components that may be
subjected to electrostatic discharge (ESD). The input
and output pins are designed and characterized to dis-
sipate ESD strikes of ±15kV safely, a level well beyond
the maximum requirements of the IEC 61000-4-2 inter-
national standard.
Using the MIL-STD-883D (Method 3015) specification
for Human Body Model (HBM) ESD, all pins are pro-
tected for contact discharges to greater than ±30kV.
The PACUSB-U1/U2/U3 is housed in either a 6-pin
SC70 or 6-pin SOT23 package and is available with
optional lead-free finishing.
Electrical Schematic
1
D1I_Ni 1
2
G^GN^ND^D
R1
C1
C1
6
O^DU^1_T^c1
R2
5
V^Vc3c.3
i = input
c = connector
3
R1
D2I_Ni2
4
O^DU^2_T^c2
© 2006 California Micro Devices Corp. All rights reserved.
SC70 6
05/01/06
490 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: [phone] ● Fax: [phone] ● www.cmd.com
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