_______________________________________________________________ maxim integrated products 1 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxims website at www.maxim-ic.com. two-lane and four-lane displayport passive switches with separate aux/hpd control MAX4998/max14998 19-5033; rev 0; 10/09 typical operating circuit appears at end of data sheet. general description the MAX4998/max14998 high-speed passive switches route displayport? between two possible destinations or vice versa in laptops or desktop pcs. the MAX4998/ max14998 are intended to be used where ultra-high- speed performance and minimal input capacitance is required. the MAX4998 has three double-pole/double-throw (dpdt) switches and one single-pole/double-throw (spdt) switch. two dpdt switches are for high-frequen - cy switching, one dpdt switch is for aux, and the one spdt switch is for hpd. the two high-frequency switches are selected by sel1, and the aux and hpd are selected by sel2. this part is suitable for two-lane displayport switching. the max14998 has six double-pole/double-throw (dpdt) switches. four dpdt switches are for high-frequency switching, and two dpdt switches are for aux and hpd. the four high-frequency switches are selected by sel1, and the aux and hpd are selected by sel2. this part is suitable for four-lane displayport switching. the MAX4998/max14998 are fully specified to operate from a single +3.3v (typ) power supply. the MAX4998 is available in a 3.5mm x 5.5mm, 28-pin tqfn package with exposed pad, and the max14998 is available in a 3.5mm x 9mm, 42-pin tqfn package with exposed pad. both devices operate over the -40 n c to +85 n c extended temperature range. applications notebook pcs desktop pcs features s single 3.3v power-supply voltage s 5ghz bandwidth s support 1.6/2.7gbps displayport signals s excellent return loss -14db at 1.35ghz s independent high frequency: aux select s designed for ac-coupled circuits s pass throughs are maintained s low 850a (max) supply current s small packages 3.5mm x 5.5mm, 28-pin tqfn package with exposed pad 3.5mm x 9mm, 42-pin tqfn package with exposed pad s flow-through layout for easy board layout s esd protection for all i/o pins: human body model (hbm) q 4kv ordering information + denotes a lead(pb)-free/rohs-compliant package. t = tape and reel. *future product. contact factory for availability. ** ep = exposed pad. displayport is a trademark of video electronics standards association (vesa). part temp range pin-package MAX4998 eti+t -40 n c to +85 n c 28 tqfn-ep** max14998 eto+t* -40 n c to +85 n c 42 tqfn-ep**
two-lane and four-lane displayport passive switches with separate aux/hpd control MAX4998/max14998 2 ______________________________________________________________________________________ stresses beyond those listed under absolute 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. (all voltages referenced to gnd, unless otherwise noted.) v dd .......................................................................... -0.3v to +4v sel1, sel2, com_, no_, nc_ (note 1) ..... -0.3v to +(v dd + 0.3)v |v com_ - v no_ |, |v com_ - v nc_ | (note 1) ..................... 0 to +2v continuous current (com_ to no_/nc_) ....................... q 70ma peak current (com_ to no_/nc_) (pulsed at 1ms, 10% duty cycle) ................................. q 70ma continuous current (sel1, sel2) ................................... q 30ma peak current (sel1, sel2) (pulsed at 1ms, 10% duty cycle) ................................. q 70ma continuous power dissipation (t a = +70 n c) 28-pin tqfn (derate 28.6mw/ n c above +70 n c) ....... 2285mw 42-pin tqfn (derate 34.5mw/ n c above +70 n c) ....... 2758mw operating temperature range .......................... -40 n c to +85 n c junction temperature ..................................................... +150 n c storage temperature range ............................ -65 n c to +150 n c package junction-to-ambient thermal resistance ( b ja ) (note 2) 28-pin tqfn ................................................................. 35 n c/w 42-pin tqfn ................................................................. 29 n c/w package junction-to-case thermal resistance ( b jc ) (note 2) 28-pin tqfn ................................................................ 2.7 n c/w 42-pin tqfn ................................................................... 2 n c/w lead temperature (soldering, 10s) ................................ +300 n c electrical characteristics (v dd = +3.3v q 10%, t a = t min to t max, unless otherwise noted. typical values are at v dd = +3.3v, t a = +25 n c, unless otherwise noted.) (note 3) absolute maximum ratings note 1: signals on com_, no_, nc_, sel1, and sel2 exceeding v dd or gnd are clamped by internal diodes. limit forward- diode current to the maximum current rating. note 2: package thermal resistances were obtained using the method described in jedec specification jesd51-7, using a 4-layer board. for detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial . parameter symbol conditions min typ max units analog switch analog signal range v com_ , v no_ , v nc_ (v dd - 1.8) v voltage between com_ and no_/nc_ |v com_ - v no_ |, |v com_ - v nc_ | 0 1.8 v on-resistance r on i com_ = 15ma; v no_ , v nc_ = 0v, +1.2v 7 i on-resistance match between pairs of same channel d r on v dd = +3.0v; i com_ = 15ma; v no_ , v nc_ = 0v (notes 4, 5) 0.1 2 i on-resistance match between channels d r on v dd = +3.0v; i com_ = 15ma; v no_ , v nc_ = 0v (notes 4, 5) 1.0 4 i on-resistance flatness r flat(on) v dd = +3.0v; i com_ = 15ma; v no_ , v nc_ = 0v, +1.2v (notes 5, 6) 0.3 1.5 i no_ or nc_ off-leakage current i no_(off) i nc_(off) v dd = +3.6v; v com_ = 0v, +1.2v; v no_ or v nc_ = +1.2v, 0v -1 1 f a com_ on-leakage current i com_(on) v dd = +3.6v; v com_ = 0v, +1.2v; v no_ or v nc_ = v com_ or unconnected -1 1 f a digital signals sel1 and sel2 to switch turn-on time t on_sel v no_ or v nc_ = +1.0v, r l = 50 i , c l = 100pf (figure 1) 45 120 ns
two-lane and four-lane displayport passive switches with separate aux/hpd control MAX4998/max14998 _______________________________________________________________________________________ 3 electrical characteristics (continued) (v dd = +3.3v q 10%, t a = t min to t max, unless otherwise noted. typical values are at v dd = +3.3v, t a = +25 n c, unless otherwise noted.) (note 3) note 3: all units are 100% production tested at t a = +85 n c. limits over the operating temperature range are guaranteed by design and characterization and are not production tested. note 4: d r on = r on(max) - r on(min) . note 5: guaranteed by design. not production tested. note 6: flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the specified analog signal range. test circuits/timing diagrams figure 1. switching time t r < 5ns t f < 5ns 50% v il logic input sel r l com_ gnd sel_ c l includes fixture and stray capacitance. v n_ v ih 0v 0v no_ or nc_ 0.9 x v out 0.9 x v out 0.9 x v out 0.9 x v out t on_sel t off_sel v out switch output com_ switch output com_ logic input sel_ v dd c l +3.3v v out t on_sel t off_sel MAX4998/max14998 v out = v n_ r l r l + r on ( ) parameter symbol conditions min typ max units sel1 and sel2 to switch turn-off time t off_sel v no_ or v nc_ = +1.0v, r l = 50 i , c l = 100pf (figure 1) 5 50 ns differential insertion loss s dd21 f = 0.8ghz (figure 2) -0.67 db f = 1.35ghz (figure 2) -0.95 differential crosstalk s ddctk f = 0.8ghz (figure 2) -37 db f = 1.35ghz (figure 2) -34 differential return loss s dd11 f = 0.8ghz (figure 2) -20 db f = 1.35ghz (figure 2) -14 signal data rate br r s = r l = 100 i balanced 17 gbps differential -3db bandwidth f -3bw r s = r l = 100 i balanced 8.5 ghz differential off-isolation s dd21_off f = 1.35ghz (figure 2) -28 db logic input (sel1, sel2) input logic-high v ih 1.4 v input logic-low v il 0.5 v input logic hysteresis v hyst 100 mv input leakage current i in v sel_ = 0v or v dd -1 +1 f a power supply power-supply range v dd 3.0 3.6 v v dd supply current i dd v sel_ = 0v or v dd 500 850 f a
two-lane and four-lane displayport passive switches with separate aux/hpd control MAX4998/max14998 4 ______________________________________________________________________________________ test circuits/timing diagrams (continued) figure 2. differential on-loss, differential off-isolation, and differential crosstalk com_+ com_- v dd +3.3v nc_+ nc_- sel1 gnd differential insertion loss/differential return loss port 1 port 2 port 3 port 4 network analyzer 0.1f v in+ v in- v out+ v out- no_+ no_- sel2 0v 0v differential insertion loss = 20log ( ) v out+ - v out- v in+ - v in- 50? 50? 50? 50? 50? 50? measurements are standardized against shorts at ic terminals. differential off-isolation is measured between com_ and ?off? no_ or nc_ terminal on each switch. differential on-loss is measured between com_ and ?on? no_ or nc_ terminal on each switch. differential crosstalk is measured between any two pairs. MAX4998 max14998 com_+ com_- v dd +3.3v nc_+ nc_- sel1 gnd differential off-isolation port 1 port 2 port 3 port 4 network analyzer 0.1f v in+ v in- v out+ v out- no_+ no_- sel2 v dd v dd differential off-isolation = 20log ( ) v out+ - v out- v in+ - v in- 50? 50? 50? 50? 50? 50? MAX4998 max14998 com_+ com_- v dd +3.3v no_+/nc_+ no_-/nc_- sel1 gnd differential crosstalk port 1 port 2 port 3 port 4 network analyzer 0.1f v in+ v in- v out+ v out- no_+/nc_+ no_-/nc_- sel2 0v or v dd 0v or v dd differential crosstalk = 20log ( ) v out+ - v out- v in+ - v in- 50? 50? com_+ com_- 50? 50? 50? 50? 50? 50? MAX4998 max14998
two-lane and four-lane displayport passive switches with separate aux/hpd control MAX4998/max14998 _______________________________________________________________________________________ 5 typical operating characteristics (t a = +25c, unless otherwise noted.) differential return loss MAX4998/max14998 toc09 frequency (mhz) differential return loss (db) 1000 100 -35 -30 -25 -20 -15 -10 -5 0 -40 10 10,000 differential crosstalk MAX4998/max14998 toc08 frequency (mhz) differential crosstalk (db) 1000 100 -70 -60 -50 -40 -30 -20 -10 0 -80 10 10,000 differential off-isolation MAX4998/max14998 toc07 frequency (mhz) differential off-isolation (db) 1000 100 -70 -60 -50 -40 -30 -20 -10 0 -80 10 10,000 differential insertion loss MAX4998/max14998 toc06 frequency (mhz) differential insertion loss (db) 1000 100 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 -10 10 10,000 turn-on/off time vs. supply voltage MAX4998/max14998 toc05 supply voltage (v) turn-on/off time (ns) 3.5 3.4 3.3 3.2 3.1 10 20 30 40 50 60 0 3.0 3.6 t on_sel t off_sel logic threshold vs. supply voltage MAX4998/max14998 toc04 supply voltage (v) logic threshold (v) 3.5 3.4 3.3 3.2 3.1 0.7 0.9 1.1 1.3 1.5 0.5 3.0 3.6 v dd = 3.3v v ih v il supply current vs. temperature MAX4998/max14998 toc03 temperature (c) supply current (a) 60 35 -15 10 100 200 300 400 600 500 700 800 0 -40 85 v dd = 3.3v on-resistance vs. com_ voltage MAX4998/max14998 toc02 v com_ (v) on-resistance (?) 1.3 1.1 0.9 0.7 0.5 0.3 0.1 5 6 7 8 9 10 4 -0.1 1.5 v dd = 3.3v i com_ = 15ma t a = +85c t a = +25c t a = -40c on-resistance vs. com_ voltage MAX4998/max14998 toc01 v com_ (v) on-resistance (?) 1.7 1.5 0.1 0.3 0.5 0.9 1.1 0.7 1.3 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 4.0 -0.1 1.9 v dd = 3.6v i com_ = 15ma
two-lane and four-lane displayport passive switches with separate aux/hpd control MAX4998/max14998 6 ______________________________________________________________________________________ pin configurations pin description MAX4998 max14998 top views tqfn 11 12 13 14 sel2 no3+ no2- no2+ 28 + 27 26 25 nc0+ nc0- nc1+ *ep *ep *connect exposed pad to ground. nc1- 1 2 3 4 5 6 7 8 9 10 24 23 22 21 20 19 18 17 16 15 sel1 v dd com3+ v dd com2- com2+ com1- com1+ com0- com0+ v dd nc3+ nc2- nc2+ v dd no1- no1+ no0- no0+ gnd tqfn + 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 com4- v dd com5+ com5- sel1 sel2 com4+ com3- com3+ com2- com2+ v dd com1- com1+ com0- com0+ v dd 18 19 20 21 no5- no5+ no4- no4+ 42 41 40 39 nc0+ nc0- nc1+ nc1- no3- v dd nc4+ nc4- nc5+ nc5- no3+ no2- no2+ no1- no1+ no0- no0+ nc3- nc3+ nc2- nc2+ pin name function MAX4998 max14998 1 2 com0+ analog switch 1. common positive terminal. 2 3 com0- analog switch 1. common negative terminal. 3 4 com1+ analog switch 2. common positive terminal. 4 5 com1- analog switch 2. common negative terminal. 5 7 com2+ analog switch 3. common positive terminal. 6 8 com2- analog switch 3. common negative terminal. 7, 9, 15, 19 1, 6, 13, 26 v dd positive supply voltage input. connect v dd to a +3.0v to +3.6v supply voltage. bypass v dd to gnd with a 0.1ff ceramic capacitor placed as close to the device as possible (see the board layout section). 8 9 com3+ analog switch 4. common positive terminal. 10 16 sel1 control signal input. selects high-frequency switching. 11 17 sel2 control signal input. selects aux/hpd. 12 28 no3+ analog switch 4. normally open positive terminal. 13 29 no2- analog switch 3. normally open negative terminal. 14 30 no2+ analog switch 3. normally open positive terminal. 16 36 nc3+ analog switch 4. normally closed positive terminal. 17 37 nc2- analog switch 3. normally closed negative terminal. 18 38 nc2+ analog switch 3. normally closed positive terminal. 20 31 no1- analog switch 2. normally open negative terminal. 21 32 no1+ analog switch 2. normally open positive terminal. 22 33 no0- analog switch 1. normally open negative terminal.
two-lane and four-lane displayport passive switches with separate aux/hpd control MAX4998/max14998 _______________________________________________________________________________________ 7 detailed description the MAX4998/max14998 high-speed passive switches route one displayport source between two possible destinations or vice versa. the MAX4998 is used to switch two-lanes plus aux/hpd displayport, and the max14998 is used to switch four-lanes plus aux/hpd displayport. the MAX4998/max14998 feature two digital control inputs (sel1, sel2) to switch signal paths. digital control inputs (sel1, sel2) the MAX4998/max14998 provide two digital control inputs (sel1, sel2) to select the signal path between the com_ and no_/nc_ channels. sel1 selects high- frequency switching, while sel2 selects aux/hpd. on the MAX4998, switches 0 and 1 are high-frequency switches and switches 2 and 3 are both low-frequency switches. on the max14998, switches 0, 1, 2, and 3 are high-frequency switches and switches 4 and 5 are low- frequency switches. the truth tables for the MAX4998/ max14998 are depicted in the functional diagrams/ truth tables . drive sel_ 0v to v dd to minimize power consumption. analog signal levels the MAX4998/max14998 accept standard displayport signals to a maximum of (v dd - 1.8v). signals on the com_+ channels are routed to either the no_+ or nc_+ channels. signals on the com_- channels are routed to either the no_- or nc_- channels. the MAX4998/ max14998 are bidirectional switches, allowing com_, no_, and nc_, to be used as either inputs or outputs. pin description (continued) pin name function MAX4998 max14998 23 34 no0+ analog switch 1. normally open positive terminal. 24 gnd ground 25 39 nc1- analog switch 2. normally closed negative terminal. 26 40 nc1+ analog switch 2. normally closed positive terminal. 27 41 nc0- analog switch 1. normally closed negative terminal. 28 42 nc0+ analog switch 1. normally closed positive terminal. 10 com3- analog switch 4. common negative terminal. 11 com4+ analog switch 5. common positive terminal. 12 com4- analog switch 5. common negative terminal. 14 com5+ analog switch 6. common positive terminal. 15 com5- analog switch 6. common negative terminal. 18 no5- analog switch 6. normally open negative terminal. 19 no5+ analog switch 6. normally open positive terminal. 20 no4- analog switch 5. normally open negative terminal. 21 no4+ analog switch 5. normally open positive terminal. 22 nc5- analog switch 6. normally closed negative terminal. 23 nc5+ analog switch 6. normally closed positive terminal. 24 nc4- analog switch 5. normally closed negative terminal. 25 nc4+ analog switch 5. normally closed positive terminal. 27 no3- analog switch 4. normally open negative terminal. 35 nc3- analog switch 4. normally closed negative terminal. ep exposed pad. internally connected to gnd. connect to a large plane to maximize thermal performance. not intended as an electrical part.
two-lane and four-lane displayport passive switches with separate aux/hpd control MAX4998/max14998 8 ______________________________________________________________________________________ functional diagrams/truth tables sel1 event switch 0 com_ to nc_ 0, 1, 2, 3 1 com_ to no_ 0, 1, 2, 3 sel2 event switch 0 com_ to nc_ 4, 5 1 com_ to no_ 4, 5 max14998 gnd no0+ no0- com0+ sel1 com0- nc0+ nc0- no1+ no1- com1+ com1- nc1+ nc1- no2+ no2- com2+ com2- nc2+ nc2- no3+ no3- com3+ com3- nc3+ nc3- no4+ no4- com4+ com4- nc4+ nc4- no5+ no5- com5+ com5- nc5+ nc5- sel2 v dd sel1 event switch 0 com_ to nc_ 0, 1 1 com_ to no_ 0, 1 sel2 event switch 0 com_ to nc_ 2, 3 1 com_ to no_ 2, 3 MAX4998 gnd sel1 no0+ no0- com0+ com0- nc0+ nc0- no1+ no1- com1+ com1- nc1+ nc1- no2+ no2- com2+ com2- nc2+ nc2- com3+ nc3+ no3+ sel2 v dd
two-lane and four-lane displayport passive switches with separate aux/hpd control MAX4998/max14998 _______________________________________________________________________________________ 9 typical operating circuit v d d = +3.3v no0+ no0- com0+ com0- com1+ com1- com2+ com2- no1+ no1- no2+ no2- no3+ +1.1v of the 7wz07 graphics and memory controller hub dp0 dp1 aux com3+ hpd sel1 sel2 channel select channel select docking station dp01 dp11 aux1 nc0+ nc0- nc1+ nc1- nc2+ nc2- displayport connector dp02 dp12 aux2 hpd1 MAX4998 v cc = +1.1v 7wz07 dual-gate lotic operates from +3.3v v cc +1.1v 10k ? nc3+ hpd2 10k ? note: the application shown is a two-lane switch between the docking station and displayport connector on a laptop. sel2 needs to be changed first when switching so that the aux/hpd signal can establish contact and set parameters through ddc. the hpd signals from the docking station and dp connector need to be input through a level translator, such as a 7wz07 or 742g07 noninverting to the MAX4998. each output is pulled up to match the logic level of the gmch. the com side of the MAX4998 needs to be connected directly to the gmch, running at low voltage (approximately 1.1v). this establishes the common-mode voltage for the switch and keeps the switch within its optimal range. if a four-lane displayport switch is desired, the max14998 should be used. the circuit is the same except that dp0 to dp3 is used with aux, and the hpd circuitry is the same. 1 2 of the 7wz07 1 2
two-lane and four-lane displayport passive switches with separate aux/hpd control MAX4998/max14998 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. 10 maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ? 2009 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. applications information board layout high-speed switches require proper layout and design procedures for optimum performance. keep design- controlled impedance pcb traces as short as possible. ensure that power-supply bypass capacitors are placed as close to the device as possible. multiple bypass capacitors are recommended. connect all grounds and the exposed pad to large ground planes. chip information process: cmos package information for the latest package outline information and land pat - terns, go to www.maxim-ic.com/packages . note that a +, #, or - in the package code indicates rohs status only. package drawings may show a different suf - fix character, but the drawing pertains to the package regardless of rohs status. package type package code document no. 28 tqfn-ep t283555+1 21-0184 42 tqfn-ep t423590+1 21-0181
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