1 www.semtech.com ECLAMP2122S usb downstream port filter & tvs for emi filtering and esd protection protection products - emiclamp ? description features circuit diagram pin configuration revision 1/24/2011 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 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- protection of usb inter- protection of usb inter- protection of usb inter- protection of usb inter- faces faces faces faces faces in cellular phones and other portable electron- ics. usb line termination is achieved with a series 22 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 15k 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 ? 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 (v bus ) and data lines (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 c1 c1 c2 c2
2 ? 2011 semtech corp. www.semtech.com protection products ECLAMP2122S absolute maximum rating g n i t a rl o b m y se u l a vs t i n u r e w o p e t a t s - y d a e t sp s s 0 0 1w m 2 - 4 - 0 0 0 1 6 c e i r e p e g r a h c s i d r i a d s e 2 - 4 - 0 0 0 1 6 c e i r e p e g r a h c s i d t c a t n o c d s e v d s e 5 2 0 2 v k e r u t a r e p m e t g n i t a r e p ot j 5 8 + o t 0 4 -c e r u t a r e p m e t e g a r o t st g t s 0 5 1 + o t 5 5 -c r e t e m a r a pl o b m y ss n o i t i d n o cm u m i n i ml a c i p y tm u m i x a ms t i n u e g a t l o v f f o - d n a t s e s r e v e r s v tv m w r 5 2 . 5v e g a t l o v n w o d k a e r b e s r e v e r s v tv r b i t a m 1 =6 v e c n a t s i s e r s e i r e sr s e n i l h c a e0 22 24 2 e c n a t s i s e r n w o d l l u pr d p e n i l h c a e5 . 3 15 15 . 6 1k e c n a t i c a p a c e d o i d s v tce n i l h c a e v r z h m 1 = f , v 0 = 7 20 33 3f p e c n a t i c a p a c l a t o tc t o t t u p t u o r o t u p n i n e e w t e b d n u o r g o t v r z h m 1 = f , v 0 = 0 5f p electrical characteristics (t = 25 o c)
3 ? 2011 semtech corp. www.semtech.com 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)
4 ? 2011 semtech corp. www.semtech.com 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 voltage - v r (v) c j (v r ) / c j (v r =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
5 ? 2011 semtech corp. www.semtech.com protection products ECLAMP2122S applications information figure 1 - eclam figure 1 - eclam figure 1 - eclam figure 1 - eclam figure 1 - eclam p2 p2 p2 p2 p2 122s cir 122s cir 122s cir 122s cir 122s cir cuit diagram cuit diagram cuit diagram cuit diagram cuit diagram c1 c1 c2 c2 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: z usb 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. 15k 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 (v bus ). general layout guidelines are given below: z avoid running d+ & d- signal line traces near high speed clock lines or similar signal lines. z avoid running critical signal lines near board edges. z place the ECLAMP2122S near the usb connector to restrict transient coupling. z minimize the path length between the usb connec- tor and the ECLAMP2122S.
6 ? 2011 semtech corp. www.semtech.com protection products ECLAMP2122S outline drawing - sot-23 6l land pattern - sot-23 6l .110 bsc .037 bsc detail aaa c seating ccc c 2x n/2 tips 2x e/2 6 see detail a1 a a2 bxn a .008 12 n e .060 .114 .063 .122 .010 - 6 a 0.20 1.60 3.10 2.80 bsc 0.95 bsc .069 1.50 2.90 .020 0.25 1.75 0.50 - ei l (l1) c 01 0.25 plane gage h 2.80 .110 bbb c a-b d 0 .008 - .004 .012 .003 (.024) .018 - .035 .000 .035 - - .045 0.10 0.20 10 0 - 10 1.15 (0.60) 0.45 .024 .009 0.30 0.08 .057 .051 .006 0.00 .90 0.90 0.22 0.60 - 0.15 1.45 1.30 - - 1.90 bsc .075 bsc a e1 d e b c plane d 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 3. or gate burrs. notes: 1. 2. -a- -b- -h- side view nom inches dimensions l1 aaa bbb ccc 01 n dim c e e1 l e1 e d a1 a2 b a min millimeters max min nom max dimensions inches y z dim g p x c millimeters p (c) z y g .043 .141 .055 (.098) .037 .024 1.40 (2.50) 0.95 0.60 1.10 3.60 x dimensions inches y z dim g p x c millimeters this land pattern is for reference purposes only. consult your manufacturing group to ensure your company's manufacturing guidelines are met. notes: 1.
7 ? 2011 semtech corp. www.semtech.com protection products ECLAMP2122S contact information semtech corporation protection products division 200 flynn rd., camarillo, ca 93012 phone: (805)498-2111 fax (805)498-3804 r e b m u n t r a p r e p y t q l e e r l e e r e z i s t c t . s 2 2 1 2 p m a l c e0 0 0 , 3h c n i 7 ordering information tape and reel specification marking device orientation in tape e p a t h t d i w ) x a m ( , bd1 de f k ) x a m ( p0 p2 p) x a m ( tw m m 8 m m 2 . 4 ) 5 6 1 . ( m m 1 . 0 + 5 . 1 m m 0 . 0 - m m 0 . 1 5 0 . 0 0 1 . 0 5 7 . 1 m m 5 0 . 0 5 . 3 m m m m 4 . 2 1 . 0 0 . 4 m m 1 . 0 0 . 4 m m 5 0 . 0 0 . 2 m m m m 4 . 0 m m 0 . 8 m m 3 . 0 + m m 1 . 0 - 0 a0 b0 k m m 5 0 . 0 - / + 3 2 . 3m m 5 0 . 0 - / + 7 1 . 3m m 5 0 . 0 - / + 7 3 . 1 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 212 yw
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