USB Downstream Port Terminator

PACUSB-D1/D2/D3

©2010 SCILLC. All rights reserved.

Publication Order Number:

June 2010 – Rev. 2

PACUSB-D1/D2/D3/D

Features

•

A low-capacitance USB downstream port

terminator, EMI filter, and transient over-voltage

(ESD) protector in a single surface-mounted

package

•

ESD protection to +20kV contact discharge, per

MIL-STD-883D, Method 3015

•

ESD protection to +15kV contact discharge, per

IEC 61000-4-2 International Standard

•

Compact SOT23-5 and SC70-5 package options

save board space and lower manufacturing costs

compared to discrete solutions

•

Capacitors matched to a precision exceeding the

USB specification

•

Pin-compatible with ST Microelectronics

USBDFxxW5 USB Downstream Port Terminator

•

Lead-free versions available

Applications

•

ESD protection and termination of USB

downstream ports

•

Desktop PCs

•

Notebooks

•

Set-top boxes

•

USB hubs

Product Description

The PACUSB-D1/D2/D3 is a single-channel USB

downstream-port termination network. It integrates

EMI/RFI

filter

components

R1

and

C1,

as

recommended by the USB specification as well as

the required 15kW pull-down resistors (R2) to GND.

In addition, PACUSB-D1/D2/D3 provides a very high

level of protection for sensitive electronic components

that may be subjected to electrostatic discharge

(ESD). The device pins will safely dissipate ESD

strikes

of

+15kV,

exceeding

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 from contact discharges to +20kV.

There are three options for the value of the series

resistor R1: 15

Ω, 22Ω, and 33Ω.

This series

resistance, plus the USB driver output resistance,

must be close to the USB cable’s characteristic

impedance

of

45

Ω (each side) to minimize

transmission line reflections.

The PACUSB-D1/D2/D3 is manufactured in a 5-pin

SC70 or a 5-pin SOT23 package and is available with

optional lead-free finishing..