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general description the max4906ef are electrostatic discharge (esd)-pro-tected analog switches that combine low on-capacitance (c on ) and low on-resistance (r on ) necessary for high- performance switching applications. the com_ inputsare protected against ?5kv esd without latchup or dam- age. the device is designed for usb 2.0 high-speed applications at 480mbps. the switches also handle all the requirements for usb low- and full-speed signaling. the max4906ef features two single-pole/double-throw (spdt) switches. the device is fully specified to operate from a single +2.7v to +3.6v power supply and is protect- ed against a +5.5v short to all analog inputs (com_, nc_, no_). this feature makes the max4906ef fully compliant with the usb 2.0 specification of +5.5v fault protection. the device features a low threshold voltage and a +1.4v v ih , permitting them to be used with low-voltage logic. the device features a qp input that when driven high, turns the charge pump off and sets the device in standbymode. when the device is in standby mode, the quies- cent supply current is reduced to 3? (max) and the switches remain operable. the max4906ef is available in a space-saving, 2mm x 2mm ?fn package and operates over a -40? to +85? temperature range. applications features ? 15kv (human body model) esd protection, on com_ ? fully specified for a single +2.7v to +3.6v power-supply voltage ? low 4 (typ), 7 (max) on-resistance (r on ) ? -3db bandwidth: 500mhz (typ) ? low bit-to-bit skew 20ps ? charge-pump noise = 90 v (typ) ? charge-pump enable ? no need for logic-level shifters for 1.4v or above ? com _ analog inputs fault-protected against shorts to usb supply rail up to +5.5v ? low supply current 3 a (max) in standby ? space-saving 10-pin, 2mm x 2mm dfn package max4906ef high-/full-speed usb 2.0 switches with high esd ___________________________________________________ _____________ maxim integrated products 1 ordering information 19-0613; rev 2; 3/09 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. + denotes a lead(pb)-free/rohs-compliant package. t = tape and reel. par emp range pin- package op mark max4906efelb+t -40c to +85c 10 dfn aaj usb switchingcell phones pdas digital still cameras gps notebook computers relay replacementsethernet switching video switching bus switches t3/e3 switches for redundancy protection 1 23 4 5 10 98 7 6 v+nc1 nc2 no1 com1 gnd qp in max4906ef dfn no2 com2 top view + pin configuration eye diagram 200ps/div v+ = 3.3vi bias = 9ma ui = 2.08ns v no1out 100mv/div v no2out usb 2.0 high speed transmit template typical operating characteristics downloaded from: http:///
high-/full-speed usb 2.0 switches with high esd 2 __________________________________________________ _____________________________________ absolute maximum ratings electrical characteristics (v+ = +2.7v to +3.6v, t a = t min to t max , charge-pump enabled, unless otherwise noted. typical values are at v+= 3.3v, t a = +25?.) (note 2) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. note 1: signals on in, qp exceeding gnd are clamped by internal diodes. limit forward-diode current to maximum current rating. (all voltages referenced to gnd.) v+ .............................................................................-0.3v to +4v in, qp (note 1) .........................................................-0.3v to +4v com_, no_, nc_ ..................................................-0.3v to +5.5v continuous current (com_ to no_/nc_) ......................?20ma peak current, (com_ to no_/nc_) (pulsed at 1ms 10% duty cycle).................................?40ma continuous power dissipation (t a = +70?) 10-pin ?fn (derate 5.0mw/? above +70?) ...........403mw operating temperature range ..........................-40? to +85? junction temperature .....................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? max4906ef parameter symbol conditions min typ max units analog switch analog signal range v com _,v no_ , v nc _ qp = gnd or v+ (note 3) 0 3.6 v fault-protection trip threshold(note 4) v fp 3.62 3.9 4.20 v t a = +25? 3.8 5 v+ = 2.7v,i com_ = -10ma, v com_ = 0v, 1.5v, qp = gnd t a = t min to t max 6 t a = +25? 4 7 on-resistance, charge-pumpenabled r on v+ = 2.7v,i com_ = -10ma, v com_ = 2.7v, qp = gnd t a = t min to t max 8 t a = +25? 5 12 v+ = 3.0v,i com_ = -10ma, v com_ = 0v, 1.5v, qp = v+ t a = t min to t max 13 t a = +25? 8 15 on-resistance, charge-pumpdisabled r on v+=2.7v,i com_ = -10ma, v com_ = 0v, 1.5v, qp = v+ t a = t min to t max 17 t a = +25? 0.5 0.8 on-resistance match betweenchannels ? r on v+ = 2.7v,i com_ = -10ma, v com_ = 0v, 1.5v, 2.7v (note 5) t a = t min to t max 1.0 on-resistance flatness r flat ( on ) v+ = 2.7v,i com_ = -10ma, v com_ = 0v, 1.5v (note 6) 0.5 downloaded from: http:///
max4906ef high-/full-speed usb 2.0 switches with high esd ___________________________________________________ ____________________________________ 3 electrical characteristics (continued) (v+ = +2.7v to +3.6v, t a = t min to t max , charge-pump enabled, unless otherwise noted. typical values are at v+= 3.3v, t a = +25?.) (note 2) parameter symbol conditions min typ max units off-leakage current i nc_, i no_ (off) v+ = 3.6v, v com_ = 0.3v, 3.3v; v no_ or v nc_ = 3.3v, 0.3v -1 +1 ? on-leakage current i nc_, i no_ (on) v+ = 3.6v, v com = 0.3v, 3.3v; v no_ or v nc_ = 0.3v, 3.3v, or unconnected -1 +1 ? switch ac performance on-channel -3db bandwidth bw r l = r s = 50 , signal = 0dbm, figure 1 500 mhz f = 10mhz; v no_ , v nc_ = 1v p-p ; r l = r s = 50 , figure 1 -60 off-isolation v iso f = 250mhz; v no_ , v nc_ = 1v p-p ; r l = r s = 50 , figure 1 -32 db f = 10mhz; v no_ , v nc_ = 1v p-p ; r l = r s = 50 , figure 1 -59 crosstalk (note 7) v ct f = 250mhz; v no_ , v nc_ = 1v p-p ; r l = r s = 50 , figure 1 -31 db charge-pump noise (note 8) v qp any input or output switch terminal = 50 90 ? switch dynamics no_, nc_, com_off-capacitance (note 9) c (off) f = 1mhz, figure 2 9 10 pf no_, nc_, com_on-capacitance (note 9) c (on) f = 1mhz, figure 2 10 12 pf switch on-capacitance matching(note 9) c onm f = 1mhz 0.4 pf turn-on time t on v n o _, v n c _ = 1.5v ; r l = 300 , c l = 35p f, v ih = v + , v il = 0v , qp = gn d , fi g ur e 3 1.4 ns turn-off time t off v no _, v nc _ = 1.5v; r l = 300 , c l = 35pf, v ih = v+, v il = gnd, qp = gnd, figure 3 35 ns propagation delay t plh_ ,t phl r l = r s = 50 , figure 4 0.2 ns fault-protection response time t fp v com_ = 0 to 5v step, r l = r s = 50 , c l = 10pf, figure 5 1 s fault-protection recovery time t fpr v com_ = 5v to 3v step, r l = r s = 50 , c l = 10pf, figure 5 1 s output skew between switches(note 9) t sk(o) skew between switch 1 and switch 2,r l = r s = 50 , figure 4 20 100 ps output skew same switch(note 9) t sk(p) skew between opposite transitions in sameswitch, r l = r s = 50 , figure 4 5 100 ps downloaded from: http:///
max4906ef high-/full-speed usb 2.0 switches with high esd 4 __________________________________________________ _____________________________________ electrical characteristics (continued) (v+ = +2.7v to +3.6v, t a = t min to t max , charge-pump enabled, unless otherwise noted. typical values are at v+= 3.3v, t a = +25?.) (note 2) parameter symbol conditions min typ max units total harmonic distortion plusnoise thd+n v com_ = 2v p-p , r l = 600 , f = 20hz to 20khz 0.01 % charge injection q v gen = 1.5v, r gen = 0 , c l = 100pf, figure 6 20 pc switch logic logic-input voltage low v il 0.4 v logic-input voltage high v ih 1.4 v input-logic hysteresis v hyst 100 mv input leakage current i in v+ = 3.6v, v in = 0 or v+ -1 +1 ? operating supply-voltage range v+ 2.7 3.6 v quiescent supply current i+ v+ = 3.6v, v in = 0 or v+, qp = gnd 160 1000 ? quiescent supply current withcharge-pump disabled i+ v+ = 3.6v, v in = 0 or v+, qp = v+ 3 ? esd protection com_ human body model ?5 kv note 2: all units are 100% production tested at t a = +25?. limits over the operating temperature range are guaranteed by design and not production tested. note 3: the switch will turn off for voltages above (v fp ); therefore, protecting downstream circuits in case of a fault condition. note 4: fault-protection trip threshold limits are not production tested; guaranteed by design. note 5: ? r on(max) = | r on(ch1) ? r on(ch2) | note 6: flatness is defined as the difference between the maximum and minimum value of on-resistance, as measured over specified analog signal ranges. note 7: between any two switches. note 8: noise specification is measured peak to peak. note 9: switch off-capacitance, switch on-capacitance, output skew between switches, and output skew same-switch limits are notproduction tested; design guaranteed by correlation. typical operating characteristics (v+ = 3.3v, t a = +25?, unless otherwise noted.) 0 32 1 4 5 6 7 8 9 10 0 32 1 4 5 6 7 8 9 10 -40 10 -15 35 60 85 leakage current vs. temperature max4906ef toc03 temperature ( c) com on-leakage current (na) com off-leakage current (pa) v+ = 3.6v com on-leakage com off-leakage 0 21 43 5 6 0 1.8 0.9 2.7 3.6 on-resistance vs. v com max4906ef toc01 v com (v) r on ( ) v+ = 2.7v v+ = 3.6v v+ = 3.3v 0 21 43 5 6 0 1.1 2.2 3.3 on-resistance vs. v com max4906ef toc02 v com (v) r on ( ) t a = +85 c t a = +25 c t a = -40 c downloaded from: http:///
max4906ef high-/full-speed usb 2.0 switches with high esd _______________________________________________________________________________________ 5 140 160 180 200 220 0 1.1 2.2 3.3 quiescent supply current vs. logic level max4906ef toc06 logic level (v) quiscent supply current ( a) 0 0.2 0.60.4 0.8 1.0 logic-input low threshold vs. supply voltage max4906ef toc07 supply voltage (v) logic-input low threshold (v) 2.7 3.0 3.3 3.6 v il turn-on/-off time vs. supply voltage supply voltage (v) t on ( s) max4906ef toc08 t off (ns) 30 32 34 36 38 40 2.7 3.0 3.3 3.6 0 1 2 3 4 5 t off t on turn-on/-off time vs. temperature temperature ( c) t on ( s) max4906ef toc09 t off (ns) 30 32 34 36 38 40 -40 -15 10 35 60 85 0 2 4 6 8 10 t on t off rise-/fall-time propagation delay vs. supply voltage supply voltage (v) output rise-/fall-time delay (ps) max4906ef toc10 2.7 3.0 3.3 3.6 200 210 220 230 240 250 t plh t phl typical operating characteristics (continued) (v+ = 3.3v, t a = +25?, unless otherwise noted.) charge injection vs. v com v com (v) charge injection (pc) max4906ef toc04 0 1.1 2.2 3.3 0 5 10 15 20 25 c l = 100pf 0 6040 20 80 100 120 140 160 180 200 -40 10 -15 35 60 85 quiescent supply current vs. temperature max4906ef toc05 temperature ( c) quiescent supply current ( a) v+ = 3.6v v+ = 2.7v downloaded from: http:///
max4906ef high-/full-speed usb 2.0 switches with high esd 6 __________________________________________________ _____________________________________ frequency response frequency (mhz) off-isolation and crosstalk (db) max4906ef toc14 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 1 10 100 1000 off-isolation crosstalk output skew between switches vs. supply voltage supply voltage (v) output skew (ps) max4906ef toc13 2.7 3.0 3.3 3.6 0 10 20 30 total harmonic distortion plus noise vs. frequency frequency (hz) thd+n (%) max4906ef toc15 10 100 1k 10k 100k 0.001 0.01 0.1 1 r l = 600 typical operating characteristics (continued) (v+ = 3.3v, t a = +25?, unless otherwise noted.) rise-/fall-time propagation delay vs. temperature temperature ( c) output rise-/fall-time delay (ps) max4906ef toc11 -40 -15 10 35 60 85 200 210 220 230 240 250 t plh t phl same switch output skew vs. supply voltage supply voltage (v) output skew (ps) max4906ef toc12 2.7 3.0 3.3 3.6 0 1 2 3 4 5 6 7 8 9 10 downloaded from: http:///
max4906ef high-/full-speed usb 2.0 switches with high esd pin description pin name function 1 in digital control input. in controls switch 1 and switch 2. 2 q p charge-pump enable input. drive qp high to turn charge pump off. for normal operation, drive qp low. 3 gnd ground 4 com1 analog switch 1?ommon terminal 5 com2 analog switch 2?ommon terminal 6 no2 analog switch 2?ormally open terminal 7 no1 analog switch 1?ormally open terminal 8 nc2 analog switch 2?ormally closed terminal 9 nc1 analog switch 1?ormally closed terminal 10 v+ positive-supply voltage input. connect v+ to a +2.7v to +3.6v supply voltage. bypass v+ to gnd with a0.1? capacitor. measurements are standardized against shorts at ic terminals. off-isolation is measured between com_ and "off" no_ or nc_ terminal on each switch. crosstalk is measured from one channel to the other channel. signal direction through switch is reversed; worst values are recorded. +3.3v v out v+ in_ nc1 com1 no1* v in max4906ef off-isolation = 20log v out v in crosstalk = 20log v out v in network analyzer 50 50 50 50 meas ref 10nf 0v or v+ 50 gnd *for crosstalk this pin is no2. nc2 and com2 are open. test circuits/timing diagrams ___________________________________________________ ____________________________________ 7 figure 1. off-isolation and crosstalk downloaded from: http:///
max4906ef high-/full-speed usb 2.0 switches with high esd 8 __________________________________________________ _____________________________________ test circuits/timing diagrams (continued) capacitance meter nc_ or no_ com_ gnd in v il or v ih 10nf v+ f = 1mhz v+ max4906ef figure 2. channel off-/on-capacitance t r < 5ns t f < 5ns 50% v il logic input r l com_ gnd in c l includes fixture and stray capacitance. v out = v n_ ( r l ) r l + r on v n_ v ih t off 0v no_ or nc_ 0.9 x v 0ut 0.1 x v out t on v out switch output logic input in depends on switch configuration;input polarity determined by sense of switch. v+ c l v+ v out max4906ef figure 3. switching time downloaded from: http:///
max4906ef high-/full-speed usb 2.0 switches with high esd ___________________________________________________ ____________________________________ 9 in+ in- in out+ out- v in+ v in- v out+ v out- nc1 or no1 nc2 or no2 com1com2 0v v+0v v+0v v+0v v+ t plhx t phlx t inrise t outrise t outfall rise-time propagation delay = t plhx or t plhy fall-time propagation delay = t phlx or t phly t sk(o) = |t plhx - t plhy | or |t phlx - t phly | t sk(p) = |t plhx - t phlx | or |t plhy - t phly | 50% 50% 50% 50% 90% 10% 10% 90% 10% 10% max4906ef r l r l 50% 50% 50%50% t infall 90% 90% t phly t plhy r s r s v il to v ih figure 4. output signal skew, rise/fall time, propagation delay ___________________________________________________ ____________________________________ 9 test circuits/timing diagrams (continued) downloaded from: http:///
max4906ef high-/full-speed usb 2.0 switches with high esd 10 _________________________________________________ _____________________________________ 2.5v v pf t pf t fpr 5v3v 0v 3v 1.5v 2.5v 0v vcom_ vnc_ vno_ figure 5. max4906ef fault-protection response/recovery time test circuits/timing diagrams (continued) v gen gnd com_ c l v out v+ v out in off on off ? v out q = ( ? v out )(c l ) nc_ logic-input waveforms inverted for switchesthat have the opposite logic sense. off on off in v il to v ih v+ r gen in max4906ef or no_ figure 6. charge injection detailed description the max4906ef are esd-protected analog switcheswhere the com_ inputs are further protected up to ?5kv esd without latchup or damage. the device is targeted for usb 2.0 high-speed (480mbps) switching applications. the device still meets usb low- and full- speed requirements and is suitable for 10/100 ethernet switching. the max4906ef features two spdt switches. the max4906ef is fully specified to operate from a single +2.7v to +3.6v supply and is +5.5v fault protected. when operating from a +2.7v to +3.6v supply, the lowthreshold of the device permits them to be used with logic levels as low as 1.4v. the max4906ef is based on a charge-pump-assisted n-channel architecture and thus operate at 170? (max) quiescent current. the device features a standby mode to reduce the quiescent current to less than 3? (max). digital control input the max4906ef provides a single-digit control logicinput, in. in controls the position of the switches as shown in the functional diagram/truth table . driving in downloaded from: http:///
max4906ef high-/full-speed usb 2.0 switches with high esd ___________________________________________________ ___________________________________ 11 rail-to-rail minimizes power consumption. with a +2.7vto +3.6v supply voltage range, the device is +1.4v logic compatible. analog signal levels the on-resistance of the max4906ef is very low and sta-ble as the analog input signals are swept from ground to v+ (see the typical operating characteristics ). these switches are bidirectional, allowing no_, nc_, andcom_ to be configured as either inputs or outputs. overvoltage fault protection the max4906ef features +5.5v fault protection toall analog inputs. fault protection prevents these switches from being damaged due to shorts to the usb bus voltage rail. charge-pump enable the max4906ef features a charge-pump enable modethat improves the performance and the dynamic range of the device. the device features a qp input that when driven high, turns the charge pump off and sets the device in standby mode. when the device is in standbymode, the quiescent supply current is reduced to 3? (max) and the switches remain operable. when qp is driven low, the charge pump is enabled and the switch- es enter an improved high-performance mode. applications information usb switching the max4906ef analog switch is fully compliant withthe usb 2.0 specification. the low on-resistance and low on-capacitance of these switches make the device ideal for high-performance switching applications. the max4906ef is ideal for routing usb data lines (see figure 7) and for applications that require switching between multiple usb hosts (see figure 8). the max4906ef also features +5.5v fault protection to guard systems against shorts to the usb bus voltage that is recommended for all usb applications. ethernet switching the wide bandwidth of the max4906ef meets the needsof 10/100 ethernet switching. the device switch the sig- nals from two interface transformers and connect the sig- nals to a single 10/100 base-t ethernet phy, simplifying docking station design and reducing manufacturing costs. 15kv esd protection as with all maxim devices, esd-protection structures areincorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. com_ are further protected against static electricity. maxim? engineers have developed state-of-the-art structures to protect these pins against esd up to ?5kv without damage. the esd structures withstandhigh esd in normal operation, and when the device is powered down. after an esd event, the max4906ef continues to function without latchup, whereas compet- ing products can latch and must be powered down to restore functionality. esd protection can be tested in various ways. the esd protection of com_ are characterized for ?5kv (human body model) using the mil-std-883. esd test conditions esd performance depends on a variety of conditions.contact maxim for a reliability report that documents test setup, test methodology, and test results. human body model figure 9a shows the human body model and figure 9bshows the current waveform it generates when dis- charged into a low impedance. this model consists of functional diagram/truth table in v+ nc1 no1nc2 no2 com1com2 gnd qp max4906ef qp in 1 1 00o f f max4906ef off no1 no2 0 on on on nc1 nc2 off 0 high performancehigh performance low performance 1o n 1 off low performance downloaded from: http:///
max4906ef high-/full-speed usb 2.0 switches with high esd 12 _________________________________________________ _____________________________________ a 100pf capacitor charged to the esd voltage of inter-est, which is then discharged into the test device through a 1.5k resistor. layout high-speed switches require proper layout and designprocedures for optimum performance. keep design- controlled-impedance pc board traces as short as pos- sible. ensure that bypass capacitors are as close to the device as possible. use large ground planes where possible. chip information process: bicmos i p 100% 90% 36.8% t rl time t dl current waveform peak-to-peak ringing(not drawn to scale) i r 10% 0 0 amperes figure 9b. human body current waveform charge-current- limit resistor discharge resistance storagecapacitor c s 100pf r c 1m r d 1500 high- voltage dc source device under test figure 9a. human body esd test model v bus asic i asic ii usb transceiver d+ d- d+ nc1no1 nc2 no2 d- d+ d- gnd usb connector com1com2 usb transceiver max4906ef nc1 usb 0 + usb 1 + usb 0 - usb 1 - no1nc2 no2 com1com2 max4906ef usb transceiver figure 7. usb data routing figure 8. switching between multiple usb hosts package type package code document no. 10 ?fn l1022+1 21-0164 package information for the latest package outline information and land patterns,go to www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only. packagedrawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. downloaded from: http:///
max4906ef high-/full-speed usb 2.0 switches with high esd maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 13 2009 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 0 8/06 initial release. 1 11/07 changed the elecrical characerisics table. 2, 4 2 3/09 changed the elecrical characerisics table to show qp = gnd. 2, 3, 4 downloaded from: http:///

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