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September 2011 Doc ID 11068 Rev 4 1/13

USBLC6-4

Very low capacitance ESD protection

Features

■ 4 data-line protection

■ Protects V

BUS

■

Very low capacitance: 3 pF typ.

■ SOT23-6L package

■ RoHS compliant

Benefits

■ Very low capacitance between lines to GND for

optimized data integrity and speed

■ Low PCB space consumption, 9 mm²

maximum foot print

■ Enhanced ESD protection: IEC 61000-4-2

level 4 compliance guaranteed at device level,

hence greater immunity at system level

■ ESD protection of V

BUS

: allows ESD current

flowing to ground when ESD event occurs on

data line

■ High reliability offered by monolithic integration

■ Low leakage current for longer operation of

battery powered devices

■ Fast response time

■ Consistent D+ / D- signal balance:

– Best capacitance matching tolerance

I/O to GND = 0.015 pF

– Compliant with USB 2.0 requirements

< 1 pF

Complies with the following standards

■ IEC 61000-4-2 level 4:

– 15 kV (air discharge)

– 8 kV (contact discharge)

Figure 1. Functional diagram

Applications

■ USB 2.0 ports up to 480 Mb/s (high speed)

■ Backwards compatible with USB 1.1 low and

full speed

■ Ethernet port: 10/100 Mb/s

■ SIM card protection

■ Video line protection

■ Portable electronics

Description

The USBLC6-4SC6 is a monolithic application

specific device dedicated to ESD protection of

high speed interfaces, such as USB 2.0, Ethernet

links and video lines.

Its very low line capacitance secures a high level

of signal integrity without compromising in

protecting sensitive chips against the most

stringent characterized ESD strikes.

SOT23-6L

I/O1 I/O4

GND V

BUS

I/O2 I/O3

www.st.com

Summary of content (13 pages)

PAGE 1
USBLC6-4 Very low capacitance ESD protection Features ■ 4 data-line protection ■ Protects VBUS ■ Very low capacitance: 3 pF typ. ■ SOT23-6L package ■ RoHS compliant SOT23-6L Figure 1.
PAGE 2
Characteristics 1 USBLC6-4 Characteristics Table 1. Absolute ratings Symbol Parameter IEC 61000-4-2 air discharge IEC 61000-4-2 contact discharge MIL STD883C-Method 3015-6 Value Unit 15 15 25 kV VPP Peak pulse voltage Tstg Storage temperature range -55 to +150 °C Tj Operating junction temperature range -40 to +125 °C TL Lead solder temperature (10 seconds duration) 260 °C Table 2. Electrical characteristics (Tamb = 25 °C) Value Symbol Parameter Test Conditions Unit Min.
PAGE 3
USBLC6-4 Figure 2. Characteristics Capacitance versus voltage (typical values) Figure 3. Line capacitance versus frequency (typical values) C(pF) C(pF) 5.0 5.0 F=1MHz VOSC=30mVRMS Tj=25°C 4.5 4.0 VOSC=30mVRMS Tj=25°C 4.5 VCC=0V 4.0 3.5 3.5 CO=I/O-GND VCC=1.65V 3.0 3.0 2.5 2.5 Cj=I/O-I/O 2.0 2.0 1.5 1.5 1.0 1.0 0.5 0.5 Data line voltage (V) 0.0 F(MHz) 0.0 0.0 0.5 Figure 4. 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.
PAGE 4
Technical information USBLC6-4 2 Technical information 2.1 Surge protection The USBLC6-4SC6 is particularly optimized to provide surge protection based on the rail to rail topology. The clamping voltage VCL can be calculated as follows: VCL+ = VTRANSIL + VF for positive surges VCL- = - VF for negative surges with: VF = VT + Rd.Ip (VF forward drop voltage, VT forward drop threshold voltage Calculation example We assume that the value of the dynamic resistance of the clamping diode is typically: Rd = 0.
PAGE 5
USBLC6-4 Technical information Figure 6. ESD behavior: parasitic phenomena due to unsuitable layout ESD sur ge on data line VCL+ VBUS Data line L I/O di dt L I/O L I/O di + L GND di dt dt L VBUS Positive Sur ge VCC pin VF VTRANSIL I/O pin VTRANSIL + VF VCL t t r = 1 ns GND pin t r = 1 ns L GND L GND di dt t - VF VCL + = VTRANSIL + VF + L I/O di + L GND di dt dt sur ge > 0 VCL- = -VF - L I/O di - L GND di dt dt sur ge > 0 Negative Sur ge -L I/O di - L GND di dt dt V TRANSIL = VBR + Rd.
PAGE 6
Technical information USBLC6-4 Figure 9. Remaining voltage after the Figure 10. Remaining voltage after the USBLC6-4SC6 during positive ESD USBLC6-4SC6 during negative ESD surge surge Note: The measurements have been done with the USBLC6-4SC6 in open circuit. Important: A good precaution to take is to put the protection device as close as possible to the disturbance source (generally the connector). 2.4 Crosstalk behavior 2.4.1 Crosstalk phenomenon Figure 11.
PAGE 7
USBLC6-4 Technical information Figure 12. Analog crosstalk measurements USBLC6-4SC6 TEST BOARD NETWORK ANALYSER PORT 1 NETWORK ANALYSER PORT 2 Vbus Figure 12. shows the measurement circuit for the analog application. In usual frequency range of analog signals (up to 240 MHz) the effect on disturbed line is less than -55 dB (see Figure 13.). Figure 13. Analog crosstalk results 0.00 dB - 30.00 - 60.00 - 90.00 F (Hz) - 120.00 100.0k 1.0M 10.0M f/Hz 100.0M 1.
PAGE 8
Technical information 2.5 USBLC6-4 Application examples Figure 14. USB 2.0 port application diagram using USBLC6-4SC6 + 3.3V DEVICEUPSTREAM RPU TRANSCEIVER SW2 + 5V USB connector SW1 VBUS RX LS/FS + RX HS + TX HS + RX LS/FS RX HS TX HS GND TX LS/FS + TX LS/FS - Protecting Bus Switch VBUS RX LS/FS + RX HS + TX HS + RX LS/FS RX HS TX HS - VBUS D+ DRS USBLC6-2SC6 GND RS RS RS RPD + 3.
PAGE 9
USBLC6-4 2.6 Technical information PSPICE model Figure 16. shows the PSPICE model of one USBLC6-4SC6 cell. In this model, the diodes are defined by the PSPICE parameters given in Figure 17. Figure 16.
PAGE 10
Ordering information scheme 3 USBLC6-4 Ordering information scheme Figure 19.
PAGE 11
USBLC6-4 4 Package information Package information ● Epoxy meets UL94, V0 ● Lead-free package In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. Table 3. SOT23-6L dimensions Dimensions Ref. Millimeters Min. c A1 q L H A E e b D e Figure 20.
PAGE 12
Ordering information 5 Ordering information Table 4. 6 Ordering information Order code Marking Package Weight Base qty Delivery mode USBLC6-4SC6 UL46 SOT23-6L 16.7 mg 3000 Tape and reel Revision history Table 5. 12/13 USBLC6-4 Document revision history Date Revision Changes 10-Dec-2004 1 First issue. 28-Feb-2005 2 Minor layout update. No content change. 04-Feb-2008 3 Updated operating junction temperature range in absolute ratings, page 2.
PAGE 13
USBLC6-4 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale.