Upstream USB Port Terminator
PACUSBU-S
Upstream USB Port Terminator
Product Description The PACUSB−U1, PACUSB−U2, and PACUSB−U3 are
single−channel US...
Description
PACUSBU-S
Upstream USB Port Terminator
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 1.5 kW pull−up resistor to V3.3 (R2).
There are three options for the value of the series resistor R1:
For PACUSB−U1, R1 = 15 W For PACUSB−U2, R1 = 33 W For PACUSB−U3, R1 = 22 W
This series resistance plus the USB driver output resistance must be close to the USB cable’s characteristic impedance of 45 W (90 W 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 15 kV safely, a level well beyond the maximum requirements of free finishing.
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 30 kV Contact Discharge per
MIL−STD−883D, Method 3015
ESD Protection to 15 kV Contact Discharge per IEC 61000−4−2
International Standard
These Devices are Pb−Free and are RoHS Compliant
Applications
ESD ...
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