ECLAMP2122S Datasheet, PDF (1/7 Pages) Semtech Corporation – USB Downstream Port Filter & TVS For EMI Filtering and ESD Protection

EClamp2122S
USB Downstream Port Filter & TVS
For EMI Filtering and ESD Protection
PROTECTION PRODUCTS - EMIClamp^®
Description
The EClamp^®2122S is combination EMI filter and line
termination device with integrated TVS diodes for use
on USB 2.0 interfaces. This device utilizes solid-state
silicon-avalanche technology for superior clamping
performance and DC electrical characteristics. They
have been optimized for protection of USB inter-
faces in cellular phones and other portable electron-
ics.
USB line termination is achieved with a series 22Ω
resistor on both the D+ and D- USB lines. These
resistors preserve signal integrity by matching the cable
impedance to that of the differential driver. The 15kΩ
pull-down resistors complete the termination circuit on
each line. They are required by the USB specification
to identify the line as a downstream connection. The
capacitors are used to bypass high frequency energy to
ground and for edge rate control of the USB signals.
Integrated TVS diodes provide ESD protection of both
(D+ & D-) data lines and the voltage bus (V_BUS). The
TVS diodes provide effective suppression of ESD
voltages in excess of 25kV (air discharge) and 20kV
(contact discharge) per IEC 61000-4-2.
The EClamp2122S is in a 6-pin SOT-23 package. The
leads are finished with lead-free matte tin. It is suit-
able for use in USB hubs, computers, peripherals, and
portable devices
Features
‹ EMI/RFI filtering and line termination with inte-
grated ESD protection
‹ ESD protection for USB power (V ) and data lines
BUS
(D+ & D-) to IIEC 61000-4-2 (ESD), ±25kV (air),
±20kV (contact)
‹ Filtering and termination for two USB data lines
‹ Series resistors for impedance matching
‹ Integrated pull down resistors as required by the
USB specification for downstream ports
‹ Low TVS operating voltage (5.25V)
‹ Solid-state technology
Mechanical Characteristics
‹ JEDEC SOT-23 6L package
‹ Pb-Free, Halogen Free, RoHS/WEEE Compliant
‹ Nominal Dimensions: 2.9 x 2.8mm
‹ Molding compound flammability rating: UL 94V-0
‹ Marking: Marking Code + Date Code
‹ Packaging: Tape and Reel
Applications
‹ USB 1.1 Interfaces
‹ USB Hubs
‹ Printers
‹ Monitors
‹ Servers, Desktop, and Notebook computers
Circuit Diagram
Pin Configuration
C1
C2
C1
C2
Revision 1/24/2011
1
(Top Side View)
www.semtech.com