ECLAMP2122S.TCT - SEMTECH INTERNATIONAL

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EClamp2122S

USB Downstream Port Filter & TVS

For EMI Filtering and ESD Protection

PROTECTION PRODUCTS - EMIClamp®

Description Features

Circuit Diagram Pin Configuration

Revision 5/26/2011

Applications

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

(Top Side View)

The EClamp®2122S is combination EMI filter and line

termination device with integrated TVS diodes for use

on USB 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-protection of USB inter-

protection of USB inter-protection of USB inter-

protection of USB inter-

facesfaces

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 (VBUS). 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

USB 1.1 Interfaces

USB Hubs

Printers

Monitors

Servers, Desktop, and Notebook computers

EMI/RFI filtering and line termination with inte-

grated ESD protection

ESD protection for USB power (VBUS) and data lines

(D+ & D-) to IEC 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

PROTECTION PRODUCTS

EClamp2122S

Absolute Maximum Rating

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Electrical Characteristics (T = 25oC)

PROTECTION PRODUCTS

EClamp2122S

Typical Characteristics

ESD Clamping (Pin 4 or 5 to GND)

(8kV Contact per IEC 61000-4-2)

ESD Clamping (Pin 4 or 5 to GND)

(-8kV Contact per IEC 61000-4-2)

Note: ESD data is taken with a 20dB attenuator

ESD Clamping (Pin 1 to GND)

(-8kV Contact per IEC 61000-4-2)

ESD Clamping (Pin 1 to GND)

(8kV Contact per IEC 61000-4-2)

PROTECTION PRODUCTS

EClamp2122S

Typical Insertion Loss S21

(Pin 2 to 5 with respect to GND)

Typical Insertion Loss S21

(Pin 3 to 4 with respect to GND)

Normalized Junction Capacitance

vs. Reverse Voltage (Data Pins)

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

1.5

012345

Reverse Voltag e - VR (V)

CJ(VR) / CJ(VR=0)

f = 1 MHz

Frequency S21 (dB)

114.9MHz -3.00

800MHz -14.11

900MHz -11.62

1.8GHz -5.16

2.5GHz -3.55

2.7GHz -3.52

Frequency S21 (dB)

114.6MHz -3.00

800MHz -12.58

900MHz -10.40

1.8GHz -4.76

2.5GHz -3.30

2.7GHz -3.38

Clamping Voltage vs. Peak Pulse Current

(Between any I/O and Ground)

00.511.522.533.5

Peak Pulse Current - IPP (A)

Cl amping Voltage - VC (V)

Waveform

Parameters:

tr = 8μs

td = 20μs

PROTECTION PRODUCTS

EClamp2122S

Applications Information

Figure 1 - EClamFigure 1 - EClam

Figure 1 - EClamp2p2

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122S Cir122S Cir

122S Circuit Diagramcuit Diagram

cuit Diagramcuit Diagram

cuit Diagram

Device Connection

The EClamp2122S is designed to provide termination,

EMI filtering and ESD protection for two USB I/O lines.

The equivalent circuit diagram is shown in Figure 1.

The device is connected as follows:

zUSB data lines are routed through the

EClamp2122S for easy implementation and opti-

mum pc board layout. Pin 1 is connected to the

voltage supply line. The input of the D+ line is

routed into pin 2 and out of pin 5. The input of the

D- line is connected at pin 3 and the output at pin

4. Pin 6 is connected to ground. The ground

connection should be made directly to the ground

plane for best results. The path length is kept as

short as possible to reduce the effects of parasitic

inductance in the board traces.

USB Port Design with EClamp2122S

The Universal Serial Bus (USB) specification requires

termination and filtering components for proper opera-

tion. In addition, an open USB socket is vulnerable to

hazardous ESD discharges in excess of 15kV. These

discharges can occur on the data lines or the voltage

bus. The EClamp2122S is an easily implemented

solution designed to meet the termination & EMI filter

requirements of the USB specification revision 1.1. It

also provides ESD protection to IEC 61000-4-2.

USB line termination is achieved with series resistors

on both the D+ and D- lines. These resistors preserve

signal integrity by matching the cable impedance to

that of the differential driver. 15kΩ pull-down resis-

tors are used to identify a downstream port. Capaci-

tors 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 (VBUS).

General layout guidelines are given below:

zAvoid running D+ & D- signal line traces near high

speed clock lines or similar signal lines.

zAvoid running critical signal lines near board edges.

zPlace the EClamp2122S near the USB connector

to restrict transient coupling.

zMinimize the path length between the USB connec-

tor and the EClamp2122S.

PROTECTION PRODUCTS

EClamp2122S

Outline Drawing - SOT-23 6L

Land Pattern - SOT-23 6L

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.037 BSC

DETAIL

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0.95 BSC

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1.75

0.50

(L1)

0.25

PLANE

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bbb C A-B D

0°

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(.024)

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1.15

(0.60)

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0.30

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0.22

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1.90 BSC.075 BSC

e1 D

PLANE

DATUMS AND TO BE DETERMINED AT DATUM PLANE

CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).

DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS

OR GATE BURRS.

NOTES:

2. -A- -B- -H-

SIDE VIEW

NOM

INCHES

DIMENSIONS

aaa

bbb

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DIM

MIN

MILLIMETERS

MAX MIN NOM MAX

DIMENSIONS

INCHES

DIM

MILLIMETERS

.043

.141

.055

(.098)

.037

.024

1.40

(2.50)

0.95

0.60

1.10

3.60

XDIMENSIONS

INCHES

DIM

MILLIMETERS

THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY.

CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR

COMPANY'S MANUFACTURING GUIDELINES ARE MET.

NOTES:

PROTECTION PRODUCTS

EClamp2122S

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Ordering Information

Tape and Reel Specification

Marking

Device Orientation in Tape

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mm mm4.2 1.0±0

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mm0.8

mm3.0+

mm1.0-

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User Direction of feed

Note: Lead finish is lead-free matte tin

YW = 2 - Alphanumeric characters for Date Code

EMIClamp and EClamp are trademarks of Semtech Corporation

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Contact Information for Semtech International AG