PACUSB-U1/U2/U3
Upstream USB Port Terminator
Features
•
•
•
•
•
One upstream USB port terminator, EMI filter and
transient overvoltage protector in a single surface-
mount package
Compact SC70 or SOT23 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
Lead-free version available
Product Description
The PACUSB-U1, PACUSB-U2, and PACUSB-U3 are
single-channel USB upstream-port termination net-
works.
The PACUSB-U1/U2/U3 integrate EMI/RFI filter com-
ponents R1 and C1, as recommended by the USB
specification. Because these are upstream USB
devices, they are terminated with a single 1.5kΩ pull-up
resistor to V
3.3
(R2).
There are three options for the value of the series
resistor R1:
• For PACUSB-U1, R1=15Ω
• For PACUSB-U2, R1=33Ω
• For PACUSB-U3, R1=22Ω
This series resistance plus the USB driver output resis-
tance must be close to the USB cable’s characteristic
impedance of 45Ω (90Ω balanced) to minimize trans-
mission line reflections.
In addition, these parts provide a very high level of pro-
tection for sensitive electronic components that may be
subjected to electrostatic discharge (ESD). The input
and output pins are designed and characterized to dis-
sipate ESD strikes of
±15kV
safely, a level well beyond
the maximum requirements of the IEC 61000-4-2 inter-
national standard.
Using the MIL-STD-883D (Method 3015) specification
for Human Body Model (HBM) ESD, all pins are pro-
tected for contact discharges to greater than
±30kV.
The PACUSB-U1/U2/U3 is housed in either a 6-pin
SC70 or 6-pin SOT23 package and is available with
optional lead-free finishing.
Applications
•
•
•
•
•
•
•
ESD protection and termination of USB port
All USB peripherals (PC printers, scanners,
zip drives, etc.)
PDAs / handheld PCs
Digital cameras
Wireless Handets
MP3 Players
Cable Modems
Electrical Schematic
1
D1_i
IN1
R1
C1
R2
6
D1_c
OUT 1
i = input
c = connector
5
V
3.3
Vcc
GND
GND
2
C1
3
R1
SC70 6
© 2006 California Micro Devices Corp. All rights reserved.
05/01/06
D2_i
IN2
4
D2_c
OUT 2
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
●
Tel: 408.263.3214
●
Fax: 408.263.7846
●
www.cmd.com
1
PACUSB-U1/U2/U3
PACKAGE / PINOUT DIAGRAMS
D1_i
1
6
D1_c
D1_i
1
6
D1_c
UUxY/
UxYR
UUx/
UxR
GND
2
5
V
3.3
GND
2
5
V
3.3
D2_i
3
4
D2_c
D2_i
3
4
D2_c
6-pin SC70
Note: Drawings are not to scale.
6-pin SOT23
PIN DESCRIPTIONS
PIN
1
2
3
4
5
6
NAME
D1_i
GND
D2_i
D2_c
V
3.3
D1_c
DESCRIPTION
The USB Controller side of the D+ or D- bidirectional transmission line of the differential
pair defined by USB standards.
The ground reference for the PACUSB-U1/U2/U3 device.
The USB Controller side of the D- or D+ bidirectional transmission line of the differential
pair defined by USB standards.
The connector side of the D- or D+ bidirectional transmission line of the differential pair
defined by USB standards.
The 3.3V supply voltage for the PACUSB-U1/U2/U3 device.
The connector side of the D+ or D- bidirectional transmission line of the differential pair
defined by USB standards.
Ordering Information
PART NUMBERING INFORMATION
Standard FInish
R1 Value (Ω)
15
15
33
33
22
22
Pins
6
6
6
6
6
6
Package
SC70-6
SOT23-6
SC70-6
SOT23-6
SC70-6
SOT23-6
Ordering Part
Number
1
PACUSB-U1
PACUSB-U1Y6
PACUSB-U2
PACUSB-U2Y6
PACUSB-U3
PACUSB-U3Y6
Part Marking
UU1
UU1Y
UU2
UU2Y
UU3
UU3Y
Lead-free Finish
Ordering Part
Number
1
PACUSB-U1R
PACUSB-U1Y6R
PACUSB-U2R
PACUSB-U2Y6R
PACUSB-U3R
PACUSB-U3Y6R
Part Marking
U1R
U1YR
U2R
U2YR
U3R
U3YR
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
© 2006 California Micro Devices Corp. All rights reserved.
2
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
●
Tel: 408.263.3214
●
Fax: 408.263.7846
●
www.cmd.com
05/01/06
PACUSB-U1/U2/U3
Specifications
ABSOLUTE MAXIMUM RATINGS
PARAMETER
V
3.3
(Supply Voltage)
Operating Temperature Range
Storage Temperature Range
DC Power to Resistor
Package Power
RATING
5.5
-40 to +85
-65 to +150
100
200
UNITS
V
°C
°C
mW
mW
STANDARD OPERATING CONDITIONS
PARAMETER
V
3.3
(Supply Voltage)
Ambient Operating Temperature
RATING
3.3
-40 to +85
UNITS
V
°C
© 2006 California Micro Devices Corp. All rights reserved.
05/01/06
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
●
Tel: 408.263.3214
●
Fax: 408.263.7846
●
www.cmd.com
3
PACUSB-U1/U2/U3
Specifications (con’t)
ELECTRICAL OPERATING CHARACTERISTICS
SYMBOL
R1
R1
R1
R2
C1
I
LEAK
V
D1
V
D2
PARAMETER
Resistance R1 (PACUSB-U1 only)
Resistance R1 (PACUSB-U2 only)
Resistance R1 (PACUSB-U3 only)
Resistance R2
Capacitance C1
Diode Leakage Current to GND
Diode Reverse-biased Stand-off
Voltage
Signal Clamp Voltage
Positive Clamp
Negative Clamp
In-system ESD Withstand Voltage
Human Body Model, MIL-STD-883,
Method 3015
IEC 61000-4-2, contact discharge
method (I/O pins)
IEC 61000-4-2, contact discharge
method (V
3.3
pin)
V
CLAMP
Clamping Voltage during ESD
Discharge
Positive
Negative
Notes 1,2
CONDITIONS
Measured at T
A
= 25°C
Measured at T
A
= 25°C
Measured at T
A
= 25°C
Measured at T
A
= 25°C
Measured at 1 MHz, 2.5VDC,
T
A
=25°C
At 3.3VDC and T
A
= 25°C
I = 10μA,T
A
= 25°C
5.5
MIN
12
26
18
1.2
38
TYP
15
33
22
1.5
47
1
MAX
18
40
26
1.8
56
100
UNITS
Ω
Ω
Ω
kΩ
pF
nA
V
@ 10mA, T
A
= 25°C
@ 10mA, T
A
= 25°C
5.6
-1.2
6.8
-0.8
8.0
-0.4
V
V
V
ESD
±
30
±
15
±
25
kV
Notes 1,2
kV
Notes 1,2
MIL-STD-883, Method 3015, 8kV;
Notes 1,2
kV
10
-5
V
V
Note 1: ESD applied to input/output/V
3.3
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 (i.e., if ESD is applied to pin 1, then clamping voltage is measured at pin 6). Unused pins are
open.
Note 2: These parameters guaranteed by design.
© 2006 California Micro Devices Corp. All rights reserved.
4
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
●
Tel: 408.263.3214
●
Fax: 408.263.7846
●
www.cmd.com
05/01/06
PACUSB-U1/U2/U3
Application Information
The PACUSB-U1/U2/U3 is targeted for upstream USB
ports (peripherals). It provides series termination, EMI
filtering, and ESD protection for the two USB data lines
D+ and D-.
The USB Specification revision 1.1 provides for two
data rates:
• The Full Speed signaling bit rate at 12 Mbits per
second, and
• The Low Speed signaling bit rate at 1.5 Mbits per
second.
The speed is selected by connecting one of the data
lines (D+ or D-) to a 3.3V supply voltage via a 1.5kΩ
pull-up resistor (R2).
PACUSB-Ux
D+
Connections for Full Speed Operation
Full Speed devices have the pull-up resistor (R2) con-
nected to the D+ data line, as shown in
Figure 1.
Pin1
is tied to the D+ line of the USB controller. Pin 6 is con-
nected to the D+ line on the USB connector.
Connections for Low Speed Operation
Low Speed devices have the pull-up resistor (R2) con-
nected to the D- data line, as shown in
Figure 2.
Pin 1
is tied to the D- line of the USB controller; pin 6 is con-
nected to the D- line on the USB connector.
1
IN1
R1
C1
R2
6
OUT 1
D+
D1_i
D1_c
3.3V
USB
CONTROLLER
GND
D-
GND
2
5
Vcc
C1
GND
V
3.3
R1
SC70-6
4
OUT 2
D-
USB
CONNECTOR
3
IN2
D2_i
D2_c
Figure 1. Full Speed Connection
PACUSB-Ux
D-
1
IN1
R1
C1
R2
6
OUT 1
D-
D1_i
D1_c
3.3V
USB
CONTROLLER
GND
D+
GND
2
5
Vcc
C1
GND
V
3.3
R1
SC70-6
4
OUT 2
D+
USB
CONNECTOR
3
IN2
D2_i
D2_c
Figure 2. Low Speed Connection
© 2006 California Micro Devices Corp. All rights reserved.
05/01/06
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
●
Tel: 408.263.3214
●
Fax: 408.263.7846
●
www.cmd.com
5
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