2000 California Micro Devices Corp. All rights reserved.
12/15/2000
215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com
1
CALIFORNIA MICRO DEVICES
PACUSB100
USB UPSTREAM PORT FILTER WITH ESD PROTECTION
SCHEMATIC CONFIGURATION
Features
Provides EMI/RFI filtering
Bi-Directional ESD protection Circuitry for
optimum system protection
Very small package
USB 1.1 compliant
Product Description
The USB is a four wire system utilizing a two wire twisted pair for transferring data, and two lines to supply power and ground
connection to hubs and devices. The USB allows for two modes of signaling. The low speed mode is defined at 1.5Mbs with
the full speed at 12Mbs.
The PACUSB100 provides ESD protection with EMI filtering and termination. It is ideal for protecting vulnerable components
in devices like keyboard, mouse, scanner/printer, etc. The PACUSB100 also supports upstream ports. California Micro Devices
also offers a complementary device (PACUSB200) to provide filtering and ESD protection for downstream ports. The PACUSB100
has the following characteristics:
Compatible with Universal Serial Bus specification 1.0.
Protects both the system and device from external ESD pulses up to 6KV per the Human Body Model.
Suppresses EMI/RFI noise on high speed data lines.
Applications
Keyboard, mouse, game peripherals
Speakers
Scanners/printers
Monitors
Modems
*Guaranteed by design
Note 1: Pins 1,4 and 8 grounded
Pins 3,5 and 6 open
Contact discharge between pins
7 and 2 to ground, one at a time
GND Pins = 1, 4, 8
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2000 California Micro Devices Corp. All rights reserved.
12/15/2000
215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com
2
CALIFORNIA MICRO DEVICES
PACUSB100
1. R1 = 33 Ohm
2. R2 = 15K Ohm
3. R3 = 1.5K Ohm
2
4. C1 = 47 pF
Note 2:
Full speed and low speed devices are differentiated by the position of the pull-up (1.5K) resistor on the downstream end of the
cable. Full speed devices are terminated with pull-up on the D
+
line. Low speed devices are terminated with the pull-up on
the D
-
line.
Application Diagram
PDF 
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