protection products 1 www.semtech.com protection products stf203-15 thru stf203-33 usb upstream port filter& tvs for emi filtering and esd protection description features schematic & pin configuration revision 05/30/2002 the stf203 is a combination emi filter and line termination device with integrated tvs diodes for use on upstream usb ports. it is constructed using a proprietary technology that allows passive components and tvs diodes to be integrated in the same package. each device will provide termination, filtering, and esd protection for one upstream usb port. the stf203 is an easily implemented solution for meeting the requirements of revision 1.1 of the universal serial bus specification. line termination is achieved with series resistors on both the d+ and d- usb lines. the value of series resistance added to the output impedance of the usb driver must be as close to possible to the 45 ? characteristic impedance of the cable (90 ? balanced) to minimize transmission line reflections. they are available with resistor values of 15 ? (stf203-15), 22 ? (stf203-22), and 33 ? (stf203-33). the 1.5k ? pull-up resistor is required by the usb specification to identify the equipment as either a full-speed (connected to d+ line) or low-speed (connected to d- line) device. the 47pf capacitors are required to bypass high frequency energy to ground and to control the edge rate of the usb signals. the tvs diodes provide esd protection of both (d+ & d-) data lines and the voltage bus (v bus ). the tvs diodes on the input/output pins provide suppression of esd voltages in excess of 15kv (air discharge) and 8kv (contact discharge) per iec 61000-4-2, level 4. the tvs diode on the v bus pin will suppress esd discharges in excess of 25kv per iec 61000-4-2. applications mechanical characteristics ? usb ports ? cellular handsets ? pda ? pagers ? digital cameras ? pc peripherals ? mp3 players ? bidirectional emi/rfi filtering and line termination with integrated esd protection ? esd protection for usb power (v bus ) and data lines (d+ & d-) to iec 61000-4-2 level 4 ? filtering and termination for one usb port ? series resistors: 15 ?, 22 ?, and 33 ? ? low tvs operating voltage (5.25v) ? low leakage current ? small sc70-6l package ? solid-state technology ? eiaj sc70-6l package ? molding compound flammability rating: ul 94v-0 ? marking : marking code ? packaging : tape and reel per eia 481 sc70-6l (top view) circuit diagram . 1 5 3 6 2 4 d in/out d in/out d in/out d in/out
2 ? 2002 semtech corp. www.semtech.com protection products stf203-15 thru stf203-33 absolute maximum rating electrical characteristics 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 k p 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 ev p p 6 1v k 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 ev p p 0 1v k e r u t a r e p m e t g n i r e d l o s d a e lt l ) . c e s 0 1 ( 0 6 2c e r u t a r e p m e t g n i t a r e p ot j 5 2 1 + 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 x x - 3 0 2 f t sx x - 3 0 2 f t s x x - 3 0 2 f t s x x - 3 0 2 f t sx x - 3 0 2 f t s r e t e m a r a pr e t e m a r a p r e t e m a r a p r e t e m a r a pr e t e m a r a pl o b m y sl o b m y s l o b m y s l o b m y sl o b m y ss n o i t i d n o cs n o i t i d n o c s n o i t i d n o c s n o i t i d n o cs n o i t i d n o cm u m i n i mm u m i n i m m u m i n i m m u m i n i mm u m i n i ml a c i p y tl a c i p y t l a c i p y t l a c i p y tl a c i p y tm u m i x a mm u m i x a m m u m i x a m m u m i x a mm u m i x a ms t i n us t i n u s t i n u s t i n us 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 t n e r r u c e g a k a e l e s r e v e r s v ti r v m w r c 5 2 = t , v 5 2 . 5 = v n e e w t e b s u b d n a n i p d n u o r g 5a t n e r r u c e g a k a e l e s r e v e r s v ti r v m w r c 5 2 = t , v 3 . 3 = a t a d y n a n e e w t e b d n a n i p ) - d , + d ( . d n u o r g 1a ) 5 1 - 3 0 2 f t s ( e c n a t s i s e r s e i r e sr s e n i l h c a e5 . 3 15 15 . 6 1 ? ) 2 2 - 3 0 2 f t s ( 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 ? ) 3 3 - 3 0 2 f t s ( 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 33 36 3 ? e c n a t s i s e r p u l l u pr p u 5 3 . 15 . 15 6 . 1k ? r o t i c a p a cce n i l h c a e7 4f p e c n a t i c a p a c l a t o tc t o t r o t u p n i n e e w t e b d n u o r g o t t u p t u o v r z h m 1 = f , v 0 = 0 6f p
3 ? 2002 semtech corp. www.semtech.com protection products stf203-15 thru stf203-33 typical characteristics esd clamping (8kv contact) typical insertion loss esd clamping (15kv air) analog crosstalk (d+ to d-) ch1 s 21 log mag 3 db/ ref 0 db start .030 000 mhz stop 3 000.000 000 mhz prm ch1 s 21 log mag 20 db/ ref 0 db start .030 000 mhz stop 3 000.000 000 mhz prm
4 ? 2002 semtech corp. www.semtech.com protection products stf203-15 thru stf203-33 device connection the stf203 is designed to provide termination, emi filtering and esd protection for one usb port. the device is connected as follows: 1. 1. 1. 1. 1. full-speed devices: for full-speed devices the pull-up resistor is connected to the d+ line. route the d+ line from the connector to pin 1 of the stf203. pin 6 is connected to the d+ line of the ic. route the d- line from the connector to pin 3. pin 4 is connected to the d- line of the ic. pin 5 is connected to the voltage supply line (v bus ). pin 2 is connected to ground. note that the input and output connections may be reversed if necessary (see figure 3). 2. 2. 2. 2. 2. low-speed devices : : : : : for low speed devices the pull-up resistor is connected to the d- line. route the d- line from the connector to pin 1 of the stf203. pin 6 is connected to the d- line of the ic. route the d+ line from the connector to pin 3. pin 4 is connected to the d+ line of the ic. pin 5 is connected to the voltage supply line (v bus ). pin 2 is connected to ground. note that the input and output connections may be reversed if necessary (see figure 4). usb port design considerations 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 stf203 is an easily implemented solution that is 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, level 4. 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. a 1.5k ? pull-up resistor is used to identify an upstream port on either the d+ (full speed devices) or the d- (low speed devices) data line. capacitors are used for emi suppression. tvs diodes provide esd protection of both (d+ & d-) data lines and the voltage bus (v bus ). the stf203 integrates all of these components in a small sc-70 package. this integrated solution simplifies design and requires minimal board space. figure 1 - preferred connection diagram (full speed devices) applications information figure 2 - preferred connection diagram (low speed devices) 1 2 34 5 6 stf203 from connector 1 2 34 5 6 stf203 from connector figure 4 - alternate connection diagram (low speed devices) figure 3 - alternate connection diagram (full speed devices) 1 2 34 5 6 stf203 from connector 1 2 34 5 6 stf203 from connector
5 ? 2002 semtech corp. www.semtech.com protection products stf203-15 thru stf203-33 outline drawing land pattern
6 ? 2002 semtech corp. www.semtech.com protection products stf203-15 thru stf203-33 contact information semtech corporation protection products division 200 flynn road, camarillo, ca 93012 phone: (805)498-2111 fax (805)498-3804 marking ordering information r e b m u n t r a p s e i r e s r e t s i s e r l e e r r e p y t qe z i s l e e r c t . 5 1 - 3 0 2 f t s5 1 ? 0 0 0 , 3h c n i 7 c t . 2 2 - 3 0 2 f t s2 2 ? 0 0 0 , 3h c n i 7 c t . 3 3 - 3 0 2 f t s3 3 ? 0 0 0 , 3h c n i 7 123 4 5 6 xxx r e b m u n t r a p s e i r e s r o t s i s e r g n i k r a m e d o c 5 1 - 3 0 2 f t s5 1 ? 5 1 3 2 2 - 3 0 2 f t s2 2 ? 2 2 3 3 3 - 3 0 2 f t s3 3 ? 3 3 3 note: xxx = marking code
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