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SPUSB1CJT Datasheet Preview

SPUSB1CJT Datasheet

Upstream USB Port Terminator

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Silicon Protection Circuits
Upstream USB Port Terminator with ESD Suppression & EMI Filtering
SPUSB1 Series NEW
The Littelfuse SPUSB1 Series is a multifunctional USB port protection
network designed to provide ESD protection, EMI/RFI filtering and line
termination for a single USB 1.1 port. The SPUSB1 can replace a mini-
mum of ten typically larger “discrete” devices resulting in inventory and
placement cost savings.
The SPUSB1 Series combines Transient Voltage Suppression (TVS)
avalanche diodes, EMI/RFI filtering components (R1 and C1), and a
1.5ktermination resistor (R2). The filtering components are included to
satisfy recommendations in the USB 1.1 specification, and the 1.5k
resistor (R2) is included as a pull-up resistor to VBUS.
The SPUSB1 Series can be used for termination and protection of
“upstream” USB devices such as PDAs, digital cameras, scanners and
hubs which are often at risk from transient voltage surges and electro-
magnetic 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’s char-
acteristic impedance of 45(90balanced) to minimize transmission
line reflections.
Circuit Diagram
1
D1
SC70-6
R1
C1
2
GND
C1
6
D4
R2
5
VBUS
3
D2
R1
4
D3
Features
• One upstream USB port terminator, EMI filter and transient overvoltage
protector in a single surface-mount package
• Compact SC70 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
Applications
• PC peripherals (printers, scanners, zip drives)
• PDAs / wireless handsets
• Digital cameras
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
TYPE
SC70-6
SC70-6
SC70-6
#/REEL
3000
3000
3000
186 w w w . l i t t e l f u s e . c o m




Littelfuse

SPUSB1CJT Datasheet Preview

SPUSB1CJT Datasheet

Upstream USB Port Terminator

No Preview Available !

Silicon Protection Circuits
Upstream USB Port Terminator with ESD Suppression & EMI Filtering
SPUSB1 Series
Parameter
Supply Voltage VBUS
DC Power per Resistor
Package Power
Temperature Range:
Operating
Storage
Absolute Maximum Ratings
Rating
5.5
100
200
-40 to 85
-65 to 150
Unit
V
mW
mW
°C
Standard
Specifications
(at 25°C unless specified otherwise)
Parameter
Resistance R1 (SPUSB1AJT only)
MIN
-20%
TYP
15
MAX
+20%
Resistance R1 (SPUSB1CJT only)
Resistance R1 (SPUSB1BJT only)
Resistance R2
Capacitance C1 @ 2.5 v DC, 1MHz
Diode Leakage at 3.3V
-20% 33 +20%
-20% 22 +20%
-20% 1.5 +20%
-20% 47 +20%
1 100
Diode Reverse Bias Stand-off Voltage, 1= 10µA
5.5
Signal Clamp Voltage:
Positive Clamp, 10mA
Negative Clamp, 10mA
5.6 6.8 8.0
-1.2 -0.8 -0.4
In-system ESD Withstand Voltage(1)
Human Body Model (MIL-STD-883D, method 3015
IEC 81000-4-2, contact discharge method (I/O pins)
IEC 81000-4-2, contact discharge method (VBUSpin)
Clamping Voltage During ESD Discharge(1)
MIL-STD-883D (Method 3015), 8kV
Positive
Negative
±30
±15
±25
10
-5
ESD Performance Notes:
(1) ESD applied to input/outputVDD pins with respect to GND, one at a time.
Clamping Voltage is measured at the opposite side of the EMI filter to the ESD pin (ie: if ESD is applied to pin1 then clamping
voltage is measured at pin 6). Unused pins are open.
These parameters guaranteed by design.
Unit
k
pF
nA
V
V
V
kV
kV
kV
V
V
5
Applications Information
D+
USB 1.1
CONTROLLER
IC
GND
1
D1
2
GND
R1
C1
C1
6
D+
D4
R2
3.3V
5
VBUS
USB 1.1
CONNECTOR
3
D-
D2
R1
4
D-
D3
Figure 1. Full-Speed Devices (12Mbits per second)
For full speed operation the pull-up resistor R2 is connected to the D+ pin.
D-
USB 1.1
CONTROLLER
IC
GND
1
D1
2
GND
R1
C1
C1
6
D-
D4
R2
3.3V
5
VBUS
USB 1.1
CONNECTOR
3
D+
D2
R1
4
D+
D3
Figure 2. Low-Speed Devices (1.5Mbits per second)
Low speed connection requires the pull-up resistor R2 to be connected to the D-
pin. Please note the reversal of the D- and D+ pins on Figure 2 versus Figure 1.
www.littelfuse.com
187


Part Number SPUSB1CJT
Description Upstream USB Port Terminator
Maker Littelfuse
Total Page 3 Pages
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