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march 2012 ? 2007 fairchild semiconductor corporation www.fairchildsemi.com fsa321 ? rev 1.0.6 fsa321 ? usb2.0 hi-speed and audio switches with negative signal capability fsa321 ? usb2.0 hi-speed (480mbps) and audio switches with negative signal capability and built-in termination on unselected audio paths features ? audio: 1.8 ? typical on resistance ? hs-usb: 8 ? typical on resistance ? hs-usb: 5pf typical on capacitance ? usb path -3db bandwidth: > 720mhz ? negative swing capable audio channel ? power-off protection on common d+/r, d-/l ports ? automatic usb detection (configurable) ? ovt on all i/o ports ? flow-through pin out eliminates pcb vias ? built-in termination on unselected audio paths to inhibit audio pop applications ? mp3, cell phone, pda, digital camera, and notebook ? lcd monitor, tv, and set-top box description the fsa321 is a double-pole, double throw (dpdt) multiplexer that combines a low-distortion audio and a usb2.0 high-speed (hs) switch path. this configuration enables audio and usb data to share a common connector port. the architecture is designed to allow audio signals to swing below ground. this means a common usb and headphone jack can be used for personal media players and portable peripheral devices. since usb2.0 is an industry standard for shared data- path in portable devices, fsa321 can be configured for automatic v bus detection. the fsa321 includes a power-off feature as well as over-voltage tolerance to minimize current consumption when v sw exceeds v cc . typical applications involve switching in portables and consumer applications, such as cell phones, digital cameras, and notebooks with hubs or controllers. . ordering information part number package number top mark package description fsa321umx mlp010a gl 10-l ead quad, ultrathin molded leadless package (mlp), 1.4 x 1.8mm v cc usb sel d- d+ r l d+/r d-/l a/lp sel control block rpd r t r t rpd figure 1. analog symbol
? 2007 fairchild semiconductor corporation www.fairchildsemi.com fsa321 ? rev.1.0.6 2 fsa321 ? usb2.0 hi-speed and audio switches with negative signal capability pin configuration v cc gnd 1 8 5 4 3 2 d+ d- r l d+/r d-/l a /lp sel usb sel 9 10 6 7 figure 2. umlp pin definitions pin # name description 9 v cc power supply 5 a/lp sel audio select override and power-save mode. this pin can be used to override usb sel for applications where analog audio is transmitted on the usb d+, d- lines. this same select pin is used to put the fsa321 in low-power mode when usb sel is low, not transmitting audio signals or usb data. the fsa321 has a weak internal pull-down, setting its default state to low and allowing this pin to float when not in use. 8 usb sel usb path select pin. can be connected to usb connector v bus pin for automatic usb detection. 10, 1 d+, d- usb data bus input sources 2, 3 r, l audio right and left input sources 7, 6 d+/r, d-/l usb and audio common connector ports truth table v cc usb sel (1) a/lp sel audio mode usb mode remarks low off off disabled inputs high-z high (2) high (2) low off on usb communication high (2) high (2) high (2) on off audio override on usb high (2) low high (2) off off low power mode high (2) low low on off audio out notes: 1. forcing usb sel high when v bus is present allows for automatic usb detection. 2. high is the threshold as defined to meet usb2.0 v cc requirements and audio supply threshold in a system (see dc tables).
? 2007 fairchild semiconductor corporation www.fairchildsemi.com fsa321 ? rev.1.0.6 3 fsa321 ? usb2.0 hi-speed and audio switches with negative signal capability functional description the fsa321 is a combined usb and audio switch that enables sharing the d+/d- lines of a usb connector with stereo audio codec outputs. the usb sel pin has an internal pull-down resistor that results in a default audio- mode configuration. the switch can be configured for auto usb detection by connecting the v bus pin to the usb sel pin. the audio switch path also handles negative signals, eliminating the need for large coupling capacitors and greatly reducing the potential for audio pop. termination resistors on the audio r and l ports are enabled when the switch is in usb mode, this also helps reduce audio pop when enabling the audio path. the fsa321 allows for an audio override state by forcing a/lp sel high when usb sel is high. this is useful for usb car kit applications or if the device is in a cradle charger when ?send/end? is pressed. application diagram usb 2.0 hi-speed controller audio codec fsa321 d+ d- r l d+/r d-/l usb sel v cc 0.1f shared usb and audio connector figure 3. typical application diagram
? 2007 fairchild semiconductor corporation www.fairchildsemi.com fsa321 ? rev.1.0.6 4 fsa321 ? usb2.0 hi-speed and audio switches with negative signal capability absolute maximum ratings stresses exceeding the absolute maximum ratings may dam age the device. the device may not function or be operable above the recommended operating conditions and st ressing the parts to these levels is not recommended. in addition, extended exposure to stresses above the recomm ended operating conditions may affect device reliability. the absolute maximum ratings are stress ratings only. symbol parameter min. max. unit v cc supply voltage -0.5 4.6 v usb sel usb select cont rol signal -0.5 6.0 v a/lp sel power save mode control signal -0.5 6.0 v v sw switch i/o voltage (3) usb path active -1.0 4.6 v audio path active v cc -4.6v 4.6 dc switch i/o voltage (3) usb path active -0.50 5.25 audio path active i ik input clamp diode current -50 ma i sw switch i/o current (continuous) usb 50 ma audio 100 ma i swpeak peak switch current (pulsed at 1ms duration, <10% duty cycle) usb 100 ma audio 250 ma t stg storage temperature range -65 +150 ? c t j maximum junction temperature +150 ? c t l lead temperature (soldering, 10 seconds) +260 ? c esd human body model, jedec: jesd22-a114 i/o to gnd 11 kv all other pins 8 vcc to gnd 12 charged discharge model, jedec: jesd22-c101 2 iec61000-4-2 system usb connection pins (d+/r, d-/l, v bus ) air gap 15 contact 8 note : 3. the input and output negative rati ngs may be exceeded if the input and output diode current ratings are observed. recommended operating conditions the recommended operating conditions table defines th e conditions for actual device operation. recommended operating conditions are specified to en sure optimal performance to the datash eet specifications. fairchild does not recommend exceeding them or designing to absolute maximum ratings. symbol parameter min. max. units v cc supply voltage 1.8 4.3 v usb sel usb select control signal 0 5.5 v a/lp sel power-save mode control signal 0 5.5 v v sw switch i/o voltage usb path active 0 4.3 v audio path active v cc -4.3v 4.3 v t a operating temperature -40 +85 oc ? ja thermal resistance (free air) umlp 284 oc/w
? 2007 fairchild semiconductor corporation www.fairchildsemi.com fsa321 ? rev.1.0.6 5 fsa321 ? usb2.0 hi-speed and audio switches with negative signal capability dc electrical char acteristics all typical values are at 25o c unless otherwise specified. symbol parameter v cc (v) conditions t a = - 40 to +85c unit min. typ. (6) max. common pins v ik clamp diode voltage 1.8 to 4.3 i ik = -18ma -1.2 v v ih control input voltage high 1.8 to 2.7 1.0 2.7 to 4.3 1.2 v il control input voltage low 1.8 to 2.7 0.3 2.7 to 4.3 0.5 i in usb sel and a/lp sel input current 1.8 to 4.3 v in = 0v -1 1 a v in = 5.5v -1 10 i off power off leakage current 0 d+/r, d-/l common ports, v sw = 0v to 5.5v, all other pins = 0v 25 a r pd a/lp sel and usb sel internal pull-down resistors 1.8 to 4.3 3 m ? r t audio path termination resistors 1.8 to 4.3 200 ? usb switch path usb analog signal range 1.8 to 4.3 0 4.3 v r onusb hs switch on resistance (4) 1.8 to 4.3 v d+/d - = 0v, 0.4v, i on = 8ma 8 11 ? ? r onusb hs delta r on (5,6) 1.8 to 4.3 v d+/d- = 0v, i on = 8ma 0.4 ? audio switch path audio analog signal range 1.8 to 4.3 v cc - 4.3v v cc v r onaudio audio switch on resistance 2.7 v l/r = -1.0v, 0v, 1.0v i on = 60ma 1.8 2.7 ? ? r onaudio audio delta r on (5) 2.7 to 4.3 v l/r = 0.7v i on = 60ma 0.4 ? r flat(audio) audio r on flatness (7) 2.7 to 4.3 i on = 60ma 0.8 1.5 ? total switch current consumption i cc usb active mode supp ly current 1.8 to 4.3 a/lp sel = low , usb sel= high, i out = 0 0.5 0.8 ma i cc_lpm usb low power mode or audio mode quiescent supply current 1.8 to 4.3 a/lp sel = high, v cc = 1.8-4.3v 10 15 a i cct increase in i cc current per control voltage and v cc low power mode a/lp sel high 4.3 v usb sel = 2.6v 10 15 a v usb sel = 1.8v 15 20 increase in i cc current per control voltage and v cc active mode a/lp sel low v usb sel = 2.6v 0.6 0.9 ma v usb sel = 1.8v 0.65 1.00 notes : 4. on resistance is determined by the voltage drop between t he a and b pins at the indicated current through the switch. 5. ? r on = r on max ? r on min measured at identical v cc , temperature, and voltage. worst-case signal path, audio or usb channel, is characterized. 6. guaranteed by characteriza tion, not production tested. 7. flatness is defined as the difference between the maximum and minimum values of on resistance over the specified range of conditions.
? 2007 fairchild semiconductor corporation www.fairchildsemi.com fsa321 ? rev.1.0.6 6 fsa321 ? usb2.0 hi-speed and audio switches with negative signal capability ac electrical char acteristics all typical value are for v cc = 3.3v at 25oc unless otherwise specified. symbol parameter v cc (v) conditions t a = - 40 to +85c unit min. typ. (8) max. t pdusb usb switch propagation delay (8) 3.3 r l = 50 ? , c l = 0pf figure 9 0.25 ns xtalk a non-adjacent channel crosstalk (audio mode) 3.3 f = 20khz, r t = 32 ? , c l = 0pf, figure 17 -110 db non-adjacent channel crosstalk (usb mode) 3.3 f = 240mhz, r t = 20 ? , c l = 0pf figure 17 -45 db o irr off isolation (audio mode) 3.3 f = 20khz, r t = 32 ? , c l = 0pf -85 db off isolation (usb mode) 3.3 f = 240mhz, r t = 20 ? , c l = 0pf -40 db bw -3db bandwidth (usb mode) 3.3 r t = 50 ? , c l = 0pf, signal 0dbm, figure 15 720 mhz thd total harmonic distortion (audio mode) 3.3 f = 20hz to 20khz, r l = 32 ? , v in = 2v pp figure 14 0.11 % snr signal-to-noise ratio (audio mode) 3.3 f = 20hz to 20khz r l = 32 ? , v in = 2v pp -90 db note : 8. guaranteed by characteriza tion, not production tested.
? 2007 fairchild semiconductor corporation www.fairchildsemi.com fsa321 ? rev.1.0.6 7 fsa321 ? usb2.0 hi-speed and audio switches with negative signal capability usb high-speed-related ac el ectrical characteristics symbol parameter v cc (v) conditions t a = - 40c to +85c unit min. typ. max. t sk(o) channel-to-channel skew (9) (usb mode) 3.3 t r = t f = 750ps (10-90%) at 240mhz c l = 0pf, r l = 50 ? figure 11 35 ps t sk(p) skew of opposite transitions of the same output (9) (usb mode) 3.3 t r = t f = 750ps (10-90%) at 240mhz c l = 0pf, r l = 50 ? figure 10 35 ps t j total jitter (9) (usb mode) 3.3 r l = 50 ? , c l = 50pf, t r = t f = 500ps (10-90%) at 480mbps (prbs = 2 15 ? 1) 130 ps note: 9. guaranteed by characteriza tion, not production tested. capacitance symbol parameter v cc (v) conditions t a = - 40c to +85c unit min. typ. max. c in control pin input capacitance 1.8 to 4.3 v bias = 0.2v 2.0 pf c on(d+/r, d-/l) d+/r, d-/l on capacitance (usb mode) 1.8 to 4.3 v bias = 0.2v, f = 240mhz, figure 13 5.4 pf 1.8 to 5.5 v bias = 0.2v, f = 1mhz, figure 13 6.0 pf c off(d+, d-) usb path off capacitance 1.8 to 4.3 f = 1mhz, figure 12 1.6 pf c off(r/l) audio path off capacitance 1.8 to 4.3 f = 1mhz, figure 12 3.5 pf
? 2007 fairchild semiconductor corporation www.fairchildsemi.com fsa321 ? rev.1.0.6 8 fsa321 ? usb2.0 hi-speed and audio switches with negative signal capability test diagrams dn or r/l d+/r or d /l i on v on r o n = v on /i on gnd v sw gnd - v cntrl =fn ( ) v cc d+/r or d- /l d+, d- or r/l a i (off) v sw gnd v cntrl =fn ( ) v cc figure 4. on resistance figure 5. off leakage v cntrl =fn i a(on) v s w a d+, d - or r/l d+/r or d-/l i i g (v cc ) nd r l , r s , and c l , are functions of the application environment (see tables for specific values). c l includes test fixture and stray capacitance. gnd r s v sw gnd r l c l gnd v out d+, d- or r,l d+/r or d -/l v cntrl =fn ( v cc ) figure 6. on leakage figure 7. a c test circuit load v cntrl =fn (v cc ) input -v cntrl t rise =1s gnd v bus v th(max) 90% 10% 10% t fall =1s output -v out 90% v oh v ol t on t off 90% v th(min) v th =v busth or v audioth t rise = 750ps gnd 0.4v 90% 90% 10% 10% t fall =750ps 50% 50% input ? v - output- v out 50% 50% v oh v ol t plh t phl t ? d+/d - - figure 8. turn-on / turn-off waveforms (usb/audio) figure 9. usb switch propagation delay waveforms
? 2007 fairchild semiconductor corporation www.fairchildsemi.com fsa321 ? rev.1.0.6 9 fsa321 ? usb2.0 hi-speed and audio switches with negative signal capability test diagrams (continued) t rise =750ps gnd 0.4v 90% 90% 10% 10% t fall = 750ps 50% 50% input ? v d+/d output- v out 50% 50% v oh v ol t plh t phl - - t rise =750ps gnd 0.4v 90% 90% 10% 10% t fall = 750ps 50% 50% input ? v d+/d - - 50% 50% v oh v ol t plh1 t phl1 o u t p u t 2 v out 50% 50% v oh v ol t plh2 t phl2 output1 v out - - t sk(o) figure 10. pulse skew: t sk(p) = | t phl ? t plh | figure 11. output skew: t sk(o) = | t plh1 ? t plh2 | or | t phl1 ? t phl2 | capacitance f=1mhz v cntrl = fn (v cc ) dn or r/l or d+/r or d- /l dn or r/l or d+/ r or d - /l meter f=240mhz v cntrl = fn (v cc ) dn or r/l or d+/r or d -/l dn or r/l or d+/ r or d - /l capacitance meter figure 12. channel off capacitance figure 13. channel on capacitance v out gnd gnd r t gnd gnd v s r s audio analyzer v cntrl gnd r s and r t are functions of the application environment (see tables for specific values). v in v cntrol = fn (v cc ) figure 14. total harmonic distortion
? 2007 fairchild semiconductor corporation www.fairchildsemi.com fsa321 ? rev.1.0.6 10 fsa321 ? usb2.0 hi-speed and audio switches with negative signal capability test diagrams (continued) v out gnd gnd r gnd gnd v s r network analyzer gnd r s and r t are functions of the application environment (see tables for specific values). v in t s v cntrl v = fn (v cc ) cntrl figure 15. usb bandwidth r s and r t are functions of the application environment (see tables for specific values). v out gnd gnd r t gnd gnd v s r s network analyzer r t gnd v cntrl gnd off isolation = 20 log (v out /v in ) v cntrl =fn ( v v cc ) v in figure 16. channel off isolation v out gnd gnd r t gnd gnd v s r s network analyzer r t gnd v gnd nc crosstalk = 20 log (v out /v in ) v in r s and r t are functions of the application environment (see tables for specific values gnd gnd gnd cntrl v cntrl =fn ( v cc ) figure 17. non-adjacent channel-to-channel crosstalk
? 2007 fairchild semiconductor corporation www.fairchildsemi.com fsa321 ? rev.1.0.6 11 fsa321 ? usb2.0 hi-speed and audio switches with negative signal capability physical dimensions a b c seating plane detail a pin#1 ident recommended land pattern notes: a. package does not fully conform to jedec standard. b. dimensions are in millimeters. c. dimensions and tolerances per asme y14.5m, 1994. d. land pattern recommendation is based on fsc design only. e. drawing filename: mkt-umlp10arev3. top view bottom view 0.15 c 0.08 c 0.15 c 2x 2x side view 0.10 c 0.05 3 6 1 0.10 c a b 0.05 c 0.55 max. 10 1.40 1.80 0.40 0.15 0.25 (10x) 0.35 0.45 (9x) 1.70 2.10 0.40 0.663 0.563 (9x) 0.225 (10x) 1 0.152 0.10 0.10 0.55 0.45 0.10 detail a scale : 2x 1.85 1.45 0.55 0.40 0.225 (10x) 9x 0.45 pin#1 ident optional minimial toe land pattern scale : 2x lead option 1 scale : 2x lead option 2 package edge figure 18. 10-lead, quad ultrathin molded leadless package (umlp) package drawings are provided as a service to customers consi dering fairchild components. drawings may change in any manner without notice. please note the revision and/or date on the drawi ng and contact a fairchild semiconductor representative to ver ify or obtain the most recent revision. package specifications do not expand the terms of fairchild?s worldwide terms and conditions, specifically the warranty therein, which covers fairchild products. always visit fairchild semiconductor?s online packa ging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/ .
? 2007 fairchild semiconductor corporation www.fairchildsemi.com fsa321 ? rev.1.0.6 12 fsa321 ? usb2.0 hi-speed and audio switches with negative signal capability

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