termination for a single USB 1.1 port. The SPUSB1 can replace a mini-
placement cost savings.
a1.5k鈩?termination resistor (R2). The filtering components are included
to satisfy recommendations in the USB 1.1 specification, and the 1.5k鈩?/div>
resistor (R2) is included as a pull-up resistor to VBUS.
The SPUSB1 Series can be used for termination and protection
of鈥渦pstream鈥?USB devices such as PDAs, digital cameras, scanners and
hubs which are often at risk from transient voltage surges and
electromagnetic interference from both internal and external sources.
To support a wide range of circuit conditions, Littelfuse offers three
resistance values for the series resistor (R1). The series resistance plus
the USB driver output resistance must be close to the USB cable鈥檚 char-
acteristic impedance of 45鈩?(90鈩?balanced) to minimize transmission
line reflections.
Features
Circuit Diagram
SC70-6
1
R1
6
鈥?Compact SC70 package saves board space and lowers
manufacturing costs compared to discrete solutions
鈥?ESD protection to 30kV contact discharge per MIL-STD- 883D,
method 3015
鈥?ESD protection to 15kV contact discharge per IEC 61000-4-2
international standard
5
VBUS
C1
C1
R2
2
GND
Applications
鈥?Desktop/Laptop PCs
鈥?USB peripherals (printers, scanners, zip drives)
鈥?PDAs / wireless handsets
鈥?Digital cameras
鈥?MP3 Players
鈥?Cable Modems
3
R1
4
Ordering Information
PART
NUMBER
SPUSB1AJT
SPUSB1BJT
SPUSB1CJT
R1 (Ohm)
12
22
33
R2 (KOhm)
1.5
1.5
1.5
C1 (pF)
47
47
47
DEVICE
BRAND
UFA
UFB
UFC
PKG
SC70-6
SC70-6
SC70-6
#/REEL
3000
3000
3000
w w w. l i t t e l f u s e . c o m
217
TVS DIODE ARRAYS
鈥?One upstream USB port terminator, EMI filter and transient
overvoltage protector in a single surface-mount package
5
LITTELFUSE
1
2
3
