Upstream USB Port Terminator
PACUSB-U1/U2/U3
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
networks.
The PACUSB-U1/U2/U3 integrate EMI/RFI filter
components R1 and C1, as recommended by the
USB specification. Because these are upstream USB
devices, they are terminated with a single 1.5kW 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
resistance must be close to the USB cable’s
characteristic impedance of 45Ω (90Ω balanced) to
minimize transmission line reflections.
In addition, these parts provide a very high level of
protection for sensitive electronic components that
may be subjected to electrostatic discharge (ESD).
The input and output pins are designed and
characterized to dissipate ESD strikes of ±15kV
safely, a level well beyond 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 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
©2010 SCILLC. All rights reserved.
June 2010 – Rev. 2
Publication Order Number:
PACUSB-U1/U2/U3/D
PACUSB-U1/U2/U3
Electrical Schematic
D1_i
D1_c
i = input
c = connector
GND
V
3.3
D2_i
D2_c
D1_i
1
6
D1_c
D1_i
1
6
D1_c
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
6-pin SOT23
PIN DESCRIPTIONS
PIN
1
NAME
D1_i
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.
2
3
GND
D2_i
4
D2_c
5
6
V
3.3
D1_c
Rev.2 | Page 2 of 9 | www.onsemi.com
PACUSB-U1/U2/U3
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
Lead-free Finish
Ordering Part
Number
1
PACUSB-U1R
PACUSB-U1Y6R
PACUSB-U2R
PACUSB-U2Y6R
PACUSB-U3R
PACUSB-U3Y6R
Part Marking
UU1
UU1Y
UU2
UU2Y
UU3
UU3Y
Part Marking
U1R
U1YR
U2R
U2YR
U3R
U3YR
Note 1: Parts are shipped in Tape & Reel form unless otherwise specified.
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
Rev. 2 | Page 3 of 9 | www.onsemi.com
PACUSB-U1/U2/U3
ELECTRICAL OPERATING CHARACTERISTICS
SYMBOL
R1
R1
R1
R2
C1
PARAMETER
Resistance R1 (PACUSB-U1 only)
Resistance R1 (PACUSB-U2 only)
Resistance R1 (PACUSB-U3 only)
Resistance R2
Capacitance C1
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
MAX
18
40
26
1.8
56
UNITS
Ω
Ω
Ω
kΩ
pF
I
LEAK
V
D1
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)
1
100
nA
V
V
D2
@ 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
Note 1
±
30
±
15
±
25
kV
Note 1
kV
Note 1
kV
V
CLAMP
Clamping Voltage during ESD
Discharge
Positive
Negative
MIL-STD-883, Method 3015, 8kV;
Note 1
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.
Rev.2 | Page 4 of 9 | www.onsemi.com
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).
Connections for Full Speed Operation
Full Speed devices have the pull-up resistor (R2) connected to the D+ data line, as shown in
Full
Speed
Connection
. Pin1 is tied to the D+ line of the USB controller. Pin 6 is connected to the D+ line on the USB
connector.
Connections for Low Speed Operation
Low Speed devices have the pull-up resistor (R2) connected to the D- data line, as shown in
Low
Speed
Connection
. Pin 1 is tied to the D- line of the USB controller; pin 6 is connected to the D- line on the USB
connector.
Figure 1. Full Speed Connection
Rev. 2 | Page 5 of 9 | www.onsemi.com
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