![](http://datasheet.mmic.net.cn/110000/PACUSBVB-D2Y6R_datasheet_3464724/PACUSBVB-D2Y6R_1.png)
2004 California Micro Devices Corp. All rights reserved.
11/15/04
430 N. McCarthy Blvd., Milpitas, CA 95035-5112
●
Tel: 408.263.3214
●
Fax: 408.263.7846
●
www.calmicro.com
1
PACUSBVB-D1/D2/D3
USB Downstream Port Terminator with
VBUS ESD Protection
Features
A low-capacitance USB downstream port termina-
tor, EMI filter, and transient over-voltage 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
Provides ESD protection for the VBUS line
Compact SOT23-6 package saves board space
and lowers manufacturing costs compared to dis-
crete solutions
Capacitors matched to a precision exceeding the
USB specification
Lead-free versions available
Applications
ESD protection and termination of USB
downstream ports
Desktop PCs
Notebooks
Set-top boxes
USB hubs
Product Description
The PACUSBVB-D1/D2/D3 is a single-channel USB
downstream-port termination network. It integrates
EMI/RFI filter components R1 and C1 as recom-
mended by the USB specification, as well as the
required 15k
Ω pull-down resistors (R2) to GND. In
addition, PACUSBVB-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.
The PACUSBVB-D1/D2/D3 also features a fifth zener
diode (cathode at pin 5) which provides ESD protection
for the USB VBUS line.
There are three options for the value of the series
resistor R1: 15
Ω, 33Ω, and 22Ω.
This series resis-
tance, 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 reflec-
tions.
The PACUSBVB-D1/D2/D3 is housed in a 6-pin
SOT23 package and is available with optional lead-
free finishing.
Electrical Schematic
GND
3
5
4
2
1
C1
R1
R2
6
VBUS