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  general description the max4999 differential hi-speed usb analog multi- plexer features low on-capacitance (c on ) switching, making it an ideal solution for the usb server/mass storage market. the max4999 is designed for usb 2.0 low-/full-/hi-speed applications with capability of sup- porting data rates up to 480mbps. the max4999 is a differential 8:1 multiplexer. the max4999 features three digital inputs to control the sig- nal path. typical applications include switching a usb connector between eight usb hosts and a usb device. an enable input (en) is provided to disable all channels and place the device into a high-impedance state (standby mode), shutting off the charge pump for mini- mum power consumption. the max4999 operates from a +3.0v to +3.6v power- supply voltage and is specified over the -40? to +85? extended temperature range. the max4999 is available in a 5mm x 5mm, 32-pin tqfn package. applications keyboard, video, mouse (kvm) servers/raid mass storage workstations features  single +3.0v to +3.6v power-supply voltage  low 6.5 ? (typ) on-resistance (r on )  -3db bandwidth: 1200mhz (typ)  enable input puts all channels in high- impedance state (standby mode)  low operating current (1?) and ultra-low quiescent current (30na) in standby mode  low threshold eliminates the need for translators in 1.8v low-voltage systems  small 32-pin, 5mm x 5mm, tqfn package max4999 usb 2.0 hi-speed differential 8:1 multiplexer ________________________________________________________________ maxim integrated products 1 ordering information 19-4127; rev 1; 6/11 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-free package. * ep = exposed pad. part temp range pin-package MAX4999ETJ+ -40? to +85? 32 tqfn-ep* pin configuration max4999 tqfn 5mm x 5mm top view 29 30 28 27 12 11 13 v cc com0 com1 c0 c1 14 gnd d4_0 gnd v cc gnd d3_1 d3_0 12 d6_1 4567 23 24 22 20 19 18 d6_0 gnd gnd d1_1 d1_0 gnd en d4_1 3 21 31 10 d7_1 d0_1 32 9 d7_0 d0_0 gnd 26 15 d2_0 d5_0 25 16 d2_1 c2 gnd 8 17 d5_1 *connect exposed pad to gnd. *ep
max4999 usb 2.0 hi-speed differential 8:1 multiplexer 2 _______________________________________________________________________________________ absolute maximum ratings package thermal characteristics (note 2) electrical characteristics (v cc = +3.0v to +3.6v, t a = -40? to +85?, unless otherwise noted. typical values are at v cc = +3.3v and t a = +25?.) (note 3) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. (all voltages referenced to gnd.) v cc ...........................................................................-0.3v to +4v all other pins (note 1)..............................................-0.3v to +4v continuous current (com_ to any switch) .......................?0ma peak current (com_ to any switch) (pulsed at 1ms, 10% duty cycle)..........................................................?20ma continuous power dissipation (t a = +70?) 32-lead tqfn (derate 34.5mw/? above +70?) ....2759mw operating temperature range ...........................-40? to +85? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? soldering temperature (reflow) .......................................+260? tqfn junction-to-ambient thermal resistance ( ja ) ............29?/w junction-to-case thermal resistance ( jc ) ...............2.0?/w parameter symbol conditions min typ max units power supply supply voltage v cc 3.0 3.6 v charge pump on 5 quiescent supply current i o charge pump off 1 ? analog switch on-resistance r on i com_ = ?0ma 6.5 12 ? on-resistance match ? r onsc v com_ = 1v, t a = +25? 0.8 ? on-resistance match between channels ? r onbc v com_ = 1v, t a = +25? 1 ? leakage current com_, d_ _0, d_ _1 i l v cc = +3.6v -1 +1 ? switch ac performance (note 4) crosstalk v dct1 any switch to non-paired switch at 500mhz (figure 3) -30 db off-isolation v off any switch to non-paired switch at 240mhz (figure 3) -27 db bandwidth -3db bw r l = 45 ? unbalanced (figure 3) 1200 mhz f = 1mhz 6 on-capacitance c on taken from s11 parameters at f = 240mhz 3.0 pf f = 1mhz, com_ 5 off-capacitance c off taken from s11 parameters at f = 240mhz 3.0 pf propagation delay t pd r l = r s = 50 ? (figure 2) 300 ps turn-on time t on v d_ _0 or v d_ _1 = +1.5v, r l = 300 ? , c l = 35pf, v ih = v cc , v il = 0v (figure 1) 10 ? note 1: signals exceeding gnd are clamped by internal diodes. limit forward-diode current to maximum current rating. note 2: package thermal resistances were obtained using the method described in jedec specification jesd51-7, using a four-layer board. for detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial .
max4999 usb 2.0 hi-speed differential 8:1 multiplexer _______________________________________________________________________________________ 3 note 3: all units are 100% production tested at t a = +85?. limits over the operating temperature range are guaranteed by design and not production tested. note 4: guaranteed by design. electrical characteristics (v cc = +3.0v to +3.6v, t a = -40? to +85?, unless otherwise noted. typical values are at v cc = +3.3v and t a = +25?.) (note 3) parameter symbol conditions min typ max units turn-off time t off v d_ _0 or v d_ _1 = +1.5v, r l = 300 ? , c l = 35pf, v ih = v cc , v il = 0v (figure 1) 10 ? output skew same port t pd skew between any d_ _0, d_ _1 line, same port 45 ? unbalanced i/o, f = 240mhz (figure 2) 30 ps switch logic input logic low v il v cc = +3.0v 0.6 v input logic high v ih v cc = +3.6v 1.7 v input logic hysteresis v hyst 200 mv input leakage current i leak v cc = +3.6v, v com_ = 0v or v cc -1 +1 ? esd protection all pins human body model ? kv test circuits/timing diagrams t r < 5ns t f < 5ns 50% v il logic input r l com_ gnd c l includes fixture and stray capacitance. v out = v in ( r l ) r l + r on v in v ih t off 0v d_ _0 or d_ _1 0.9 x v 0ut 0.9 x v out t on v out switch output logic input in depends on switch configuration; input polarity determined by sense of switch. c l v out max4999 c_ v cc figure 1. switching time
max4999 usb 2.0 hi-speed differential 8:1 multiplexer 4 _______________________________________________________________________________________ test circuits/timing diagrams (continued) in+ in- out+ out- v in+ v in- v out+ v out- d0_1 d0_0 com1 com0 0v v cc 0v v+ 0v v cc 0v v cc t plh t phl t r t f rise-time propagation delay = t plh . fall-time propagation delay = t phl . t sk = |t plh - t phl |. r s = r l = 50 ? . 50% 50% 50% 50% 90% 10% 10% r l r l 50% 50% 50% 50% 90% t phl t plh r s r s max4999 c 0 c 1 c 2 figure 2. propagation delay and skew
max4999 usb 2.0 hi-speed differential 8:1 multiplexer _______________________________________________________________________________________ 5 test circuits/timing diagrams (continued) measurements are standardized against short at socket terminals. off-isolation is measured between com_ and "off" usb_ terminal on each switch. on-loss is measured between com_ and "on" usb_ terminal on each switch. crosstalk is measured from one usb_ channel to another usb_ channel. signal direction through switch is reversed; worst values are recorded. v cc v out v in gnd v+ v in v out meas. network analyzer 50 ? 50 ? 50 ? off-isolation = 20log on-loss = 20log crosstalk = 20log 50 ? ref. c1 v out v in v out v in c0 channel select en high d_ _ _ com_ 0.1 f max4999 c2 figure 3. off-isolation, on-loss, and crosstalk
max4999 usb 2.0 hi-speed differential 8:1 multiplexer 6 _______________________________________________________________________________________ typical operating characteristics (v cc = +3.3v, t a = +25?, unless otherwise noted.) 4.6 5.0 4.8 5.4 5.2 5.8 5.6 6.0 0 1.2 1.8 0.6 2.4 3.0 3.6 on-resistance vs. v com_ max4999 toc01 v com_ (v) r on ( ? ) v cc = +3.0v v cc = +3.3v v cc = +3.6v 4.0 5.0 4.5 6.0 5.5 6.5 7.0 0 1.1 2.2 3.3 on-resistance vs. v com_ max4999 toc02 v com_ (v) r on ( ? ) v cc = +3.3v t a = +85 c t a = +25 c t a = -40 c 0 40 20 80 60 100 120 -40 85 leakage current vs. temperature max4999 toc03 temperature ( c) leakage current (na) 10 -15 35 60 v cc = +3.6v com_ on-leakage com_ off-leakage 0.50 0.75 0.63 1.00 0.88 1.13 1.25 -40 85 quiescent supply current vs. temperature max4999 toc04 temperature ( c) quiescent supply current ( a) 10 -15 35 60 v cc = +3.3v v cc = +3.0v v cc = +3.6v 0.70 0.80 0.75 0.90 0.85 0.95 1.00 3.0 3.3 3.2 3.5 3.6 logic threshold vs. supply voltage max4999 toc05 supply voltage (v) logic threshold (v) v ih v il 0 -100 1 10 100 1000 10,000 frequency response -80 max4999 toc06 frequency (mhz) magnitude (db) -60 -40 -20 -30 -50 -70 -90 -10 off-isolation on-response crosstalk eye diagram - single max4999 toc07 eye diagram - double max4999 toc08
max4999 usb 2.0 hi-speed differential 8:1 multiplexer _______________________________________________________________________________________ 7 detailed description the max4999 differential hi-speed usb analog multi- plexer features low on-capacitance (c on ) and low on- resistance (r on ) necessary for high-performance switching applications. the low c on is designed for usb server/mass storage devices. this device is ideal for usb 2.0 hi-speed applications at 480mbps, while also meeting the requirements for usb low-/full-speed applications. digital control inputs (c0, c1, c2) the max4999 provides three digital control inputs (c0, c1, c2) to select the analog signal path between the com_ and d-/d+ channels. the truth table for the max4999 is shown in the functional diagram/truth table. driving the control inputs rail-to-rail minimizes power consumption. enable input (en) the max4999 features an enable input that when driven low, places the device in standby mode. in standby mode, all channels are high impedance and the internal charge pump is disabled, thus minimizing the quiescent supply current. for normal operation, drive en high. analog signal levels signals applied to com1 are routed to d_ _1 terminals. signals applied to com0 are routed to d_ _0 terminals. this multiplexer is bidirectional, allowing com_ and d-/d+ terminals to be configured as either inputs or outputs. additionally, the max4999 can be used for non-usb signals if the signals fall within the normal operating range. the max4999 features an internal charge pump that allows signal levels greater than the supply voltage. limit the analog input/output signal level to no more than the absolute maximum ratings . pin description pin name function 1, 11, 14, 17, 21, 24, 27, 30 gnd ground 2, 20 v cc power-supply input. bypass v cc to gnd with a 0.1? capacitor placed as close to v cc as possible. 3 en enable input 4 com0 analog switch common d- terminal 5 com1 analog switch common d+ terminal 6 c0 control input 0 7 c1 control input 1 8 c2 control input 2 9 d0_0 analog switch 0 d- terminal 10 d0_1 analog switch 0 d+ terminal 12 d1_0 analog switch 1 d- terminal 13 d1_1 analog switch 1 d+ terminal 15 d2_0 analog switch 2 d- terminal 16 d2_1 analog switch 2 d+ terminal 18 d3_0 analog switch 3 d- terminal 19 d3_1 analog switch 3 d+ terminal 22 d4_1 analog switch 4 d+ terminal 23 d4_0 analog switch 4 d- terminal 25 d5_1 analog switch 5 d+ terminal 26 d5_0 analog switch 5 d- terminal 28 d6_1 analog switch 6 d+ terminal 29 d6_0 analog switch 6 d- terminal 31 d7_1 analog switch 7 d+ terminal 32 d7_0 analog switch 7 d- terminal ep exposed pad. connect ep to gnd or leave unconnected.
max4999 usb 2.0 hi-speed differential 8:1 multiplexer 8 _______________________________________________________________________________________ applications information increasing usb channels the max4999 features an enable input that allows two max4999s to be connected, allowing multiplexing between 16 usb channels. figure 4 shows the typical application with a single usb common terminal multi- plexed to eight channels (8:1). see the eye diagram - single graph in the typical operating characteristics . figure 5 shows two max4999 devices configured with the usb common terminal multiplexed to 16 usb chan- nels (16:1). see the eye diagram - double graph in the typical operating characteristics . the max4999 was designed to be symmetrical so that the two common ports may be wired in parallel with very short wiring to create a 16:1 configuration. when operating in 16:1 con- figuration, interchange com0 and com1 on the second device to reverse the d+ and d- pins. this minimizes vias and crossovers (figure 5). usb switching the max4999 analog multiplexers are fully compliant with the usb 2.0 specification. the low on-resistance and low on-capacitance of the max4999 make it ideal for high-performance switching applications. board layout hi-speed switches require proper layout and design pro- cedures for optimum performance. keep design-con- trolled impedance pcb traces as short as possible. ensure that high-quality bypass ceramic capacitors (x7r, x5r or better) are placed as close to the device as possible and use large ground planes where possible. v cc gnd c0 en c1 c2 control logic charge pump max4999 com1 mux d0 _1 d1 _1 d2 _1 d3 _1 d4 _1 d5 _1 d6 _1 d7 _1 com0 mux d0 _0 d1 _0 d2 _0 d3 _0 d4 _0 d5 _0 d6 _0 d7 _0 functional diagram/truth table x = don? care max4999 en c2 c1 c0 function 1 0 0 0 com_ d0_ _ 1 0 0 1 com_ d1_ _ 1 0 1 0 com_ d2_ _ 1 0 1 1 com_ d3_ _ 1 1 0 0 com_ d4_ _ 1 1 0 1 com_ d5_ _ 1 1 1 0 com_ d6_ _ 1 1 1 1 com_ d7_ _ 0xxx standby mode. all switches in high- impedance state. charge pump is off.
max4999 usb 2.0 hi-speed differential 8:1 multiplexer _______________________________________________________________________________________ 9 gnd v cc +3.3v usb7 + - d7_1 d7_0 usb6 + - d6_1 d6_0 usb5 + - d5_1 d5_0 25 26 28 29 31 32 usb0 + - d0_1 d0_0 usb1 + - d1_1 d1_0 usb2 + - d2_1 d2_0 16 15 13 12 10 9 usb3 + - d3_1 d3_0 usb4 - + d4_0 d4_1 23 22 19 18 common - + 453678 en c0 c1 c2 1, 11, 14, 17, 21, 24, 27, 30 max4999 2, 20 figure 4. the max4999 multiplexes between eight differential channels (8:1) usb d+, d- must be reversed if devices are connected as shown, this is true of d0_ _ to d7_ _. c0, c1, c2 are connected in parallel. en0 and en1 are used to select between device 0 and device 1. one pair shown + - 16 15 d20 + - 15 16 d20 4 5 1 8 5 4 1 + + c2 c1 c0 en0 en1 6 7 8 usb type a common 7 6 3 3 max4999 device 0 max4999 device 1 figure 5. combining two max4999 devices for 16:1 usb connections
max4999 usb 2.0 hi-speed differential 8:1 multiplexer 10 ______________________________________________________________________________________ chip information process: cmos package information for the latest package outline information and land patterns (footprints), 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 suffix character, but the drawing pertains to the package regardless of rohs status. package type package code outline no. land pattern no. 32 tqfn t3255+4 21-0140 90-0012
max4999 usb 2.0 hi-speed differential 8:1 multiplexer maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it 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 ____________________ 11 2011 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 0 5/08 initial release 1 6/11 added package thermal characteristics ; renamed pins in figure 4; changed pin references in electrical characteristics , figures 3 and 5, tocs, and functional diagram . 2, 5, 6, 8, 9


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