Upstream USB Port Terminator

PACUSB-U1/U2/U3

©2010 SCILLC. All rights reserved.

Publication Order Number:

June 2010 – Rev. 2

PACUSB-U1/U2/U3/D

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

networks.

The PACUSB-U1/U2/U3 integrate EMI/RFI filter

components R1 and C1, as recommended by the

USB specification. Because these are upstream USB

devices, they are terminated with a single 1.5kW pull-

up resistor to V

There are three options for the value of the series

resistor R1:

•

For PACUSB-U1, R1=15

Ω

•

For PACUSB-U2, R1=33

Ω

•

For PACUSB-U3, R1=22

Ω

This series resistance plus the USB driver output

resistance must be close to the USB cable’s

characteristic impedance of 45

Ω (90Ω balanced) to

minimize transmission line reflections.

In addition, these parts provide a very high level of

protection for sensitive electronic components that

may be subjected to electrostatic discharge (ESD).

The input and output pins are designed and

characterized to dissipate ESD strikes of ±15kV

safely,

a

level

well

beyond

the

maximum

requirements of the IEC 61000-4-2 international

standard.

Using

the

MIL-STD-883D

(Method

3015)

specification for Human Body Model (HBM) ESD, all

pins are protected 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.