View MAX14972_3724415.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

????????????????????????????????????????????????????????????????? maxim integrated products 1 typical operating circuit 19-5952; rev 1; 3/12 ordering information appears at end of data sheet. general description the MAX14972 dual superspeed usb 3.0 equalizer/ redriver utilizes programmable input equalization and output deemphasis to reduce deterministic jitter and restore signal loss caused by circuit-board or signal- cable losses, and allows optimal placement of key superspeed usb 3.0 components and longer circuit- board traces or cables. the device features advanced power management with receiver detection and explicit support for usb 3.0 low-frequency periodic signals (lfps). the device is available in a small, 24-pin (4.0mm x 4.0mm) tqfn package with flow-through traces for opti - mal layout and minimal space requirements. the device is specified over the 0 n c to +70 n c commercial operating temperature range. applications usb ports usb hubs notebook computers desktop computers docking stations industrial usb switching benefits and features s innovative design eliminates need for costly external components ? single +3.3v supply operation s advanced power management for maximum efficiency ? 1mw (typ) in standby state ? 23mw (typ) in receiver detect state ? 82.5mw (typ) in dynamic power-down state ? 304mw (typ) in active state s high level of integration for performance ? very low latency with 250ps (typ) propagation delay ? 10db (typ) input/output return loss up to 2.5ghz ? three-level programmable input equalization ? six-level programmable output deemphasis ? explicit lfps support with frequency shaping ? superspeed usb 3.0-compliant receiver detection ? low-voltage (1.8v) compatible controls ? excellent jitter and loss compensation capability > 40in of 4mil microstrip s ideal for space-sensitive applications ? on-chip 50 i input/output terminations ? 24-pin, 4.0mm x 4.0mm tqfn packaging ? 8kv hbm esd protection on all pins ? pin-to-pin compatible with ti sn65lvpe502 and ti sn65lvpe502cp 100nf (x7r) 100nf (x7r) 100nf (x7r) 100nf (x7r) 100nf (x7r) 100nf (x7r) single differential pair single differential pair connectors midplane main board remote board tx+ rx1+ v cc 0.1f rx1- tx2+ tx2- tx1+ tx1- rx2+ rx2- gnd rx+ rx- tx- usb 3.0 host 100nf (x7r) 100nf (x7r) rx+ tx+ tx- rx- usb 3.0 device MAX14972 MAX14972 dual superspeed usb 3.0 equalizer/redriver evaluation kit available for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxims website at www.maxim-ic.com.
????????????????????????????????????????????????????????????????? maxim integrated products 2 MAX14972 dual superspeed usb 3.0 equalizer/redriver (voltages referenced to gnd.) v cc ..................................................................... -0.3v to +4.0v all other pins (note 1) ........................... -0.3v to (v cc + 0.3v) continuous current rx_+, rx_-, tx_+, tx_- ................. q 30ma continuous power dissipation (t a = +70 n c) tqfn (derate 27.8mw/ n c above +70 n c) ............ 2222.2mw operating temperature range ........................... 0 n c to +70 n c junction temperature range ........................ -40 n c to +150 n c storage temperature range ......................... -65 n c to +150 n c lead temperature (soldering, 10s) ............................... +300 n c soldering temperature (reflow) ..................................... +260 n c tqfn junction-to-ambient thermal resistance ( q ja ) ......... 36 n c/w junction-to-case thermal resistance ( q jc ) ................. 3 n c/w absolute maximum ratings 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 . note 1: all i/o pins are clamped by internal diodes. stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional opera - tion 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. package thermal characteristics (note 2) electrical characteristics (v cc = +3.0v to +3.6v, c c = 100nf coupling capacitor on each output, r l = 50 i and c l = 1pf on each output, t a = 0 n c to +70 n c, unless otherwise noted. typical values are at v cc = +3.3v and t a = +25 n c.) parameter symbol conditions min typ max units dc performance power-supply range v cc 3.0 3.3 3.6 v operating supply current i cc enrxd = 1, data rate = 5.0gbps, d10.2 pattern, de _ = v cc , os_ = gnd 92 125 ma enrxd = 1, cm = 0, no output termination 7 10 dynamic power-down mode, enrxd = 1, cm = 0, with output termination, no input signal 25 32 standby supply current i stby enrxd = 0 500 f a differential input impedance z rx-dc-diff dc 72 120 i differential output impedance z tx-dc-diff dc 72 120 i single-ended high input impedance z rx-se-high no output termination , cm = 0 (note 3) 25 50 k i common-mode input impedance z rx-dc-cm (note 3) 18 30 i common-mode output impedance z tx-dc-cm (note 4) 18 30 i common-mode input voltage v rx-dc-cm (note 3) 0 v common-mode output voltage v tx-dc-cm (note 3) 2.75 v active lfps common-mode delta d v lfps-cm active lfps squelched and not squelched 50 mv
????????????????????????????????????????????????????????????????? maxim integrated products 3 MAX14972 dual superspeed usb 3.0 equalizer/redriver electrical characteristics (continued) (v cc = +3.0v to +3.6v, c c = 100nf coupling capacitor on each output, r l = 50 i and c l = 1pf on each output, t a = 0 n c to +70 n c, unless otherwise noted. typical values are at v cc = +3.3v and t a = +25 n c.) parameter symbol conditions min typ max units ac performance (note 5) redriver-operation differential input signal range v rx-diff-pp usb 3.0 data 150 1200 mv p-p lfps detect threshold v lfps-diff-pp usb 3.0 data 100 300 mv differential input return loss rl rx-diff 50mhz p f < 1250mhz 16 18 db 1250mhz p f < 2500mhz 8 12 differential output return loss rl tx-diff 50mhz p f < 1250mhz 13 16 db 1250mhz p f < 2500mhz 8 10 common-mode input return loss rl rx-cm 50mhz p f < 2500mhz 11 13 db common-mode output return loss rl tx-cm 50mhz p f < 2500mhz 11 13 db differential output amplitude (transition bit), figure 1 v tx-diff-tb-pp os_ = 0, de_ = 0 1120 mv p-p os_ = 0, de_ = n.c. 940 os_ = 0, de_ = 1 1210 os_ = 1 or n.c., de_ = 0 1180 os_ = 1 or n.c., de_ = n.c. 1010 os_ = 1 or n.c., de_ = 1 1270 differential output amplitude (nontransition bit), figure 1 v tx-diff-ntb-pp de_ = n.c. 640 mv p-p de_ = 0 840 de_ = 1 940 lfps idle differential output voltage v lfps-idle- diff -pp highpass filter to remove dc offset 30 mv voltage change to allow receiver detect v detect positive voltage to sense receiver termination 500 mv deterministic jitter t tx-dj-dd k28.5 pattern, data rate = 5.0gbps, eq_ = not connected 12 ps p-p random jitter t tx-rj-dd k28.5 pattern, data rate = 5.0gbps, eq_ = not connected 1 ps rms rise/fall time t tx-rise-fall (note 6) 40 ps differential propagation delay t pd propagation delay input to output at 50% 250 ps lfps idle entry delay t idle-entry usb 3.0 lfps pattern, active state 4 6 ns lfps idle exit delay t idle-exit usb 3.0 lfps pattern, active state 4 6 ns usb 3.0 lfps pattern, dynamic power- down state 15.6 22.5
????????????????????????????????????????????????????????????????? maxim integrated products 4 MAX14972 dual superspeed usb 3.0 equalizer/redriver electrical characteristics (continued) (v cc = +3.0v to +3.6v, c c = 100nf coupling capacitor on each output, r l = 50 i and c l = 1pf on each output, t a = 0 n c to +70 n c, unless otherwise noted. typical values are at v cc = +3.3v and t a = +25 n c.) note 3: measured with respect to ground. note 4: measured with respect to v cc . n ote 5: guaranteed by design, unless otherwise noted. note 6: rise and fall times are measured using 20% and 80% levels. figure 1. illustration of output deemphasis parameter symbol conditions min typ max units control logic input logic-high v ih enrxd, cm, eq_, os_, and de_ 1.5 v input logic-low v il enrxd, cm, eq_, os_, and de_ 0.5 v input logic hysteresis v hyst enrxd, cm, eq_, os_, and de_ 0.075 v esd protection hbm esd protection human body model 8 kv v tx-diff-ntb-pp v tx-diff-ntb-pp de (d b) = 20 log v tx-diff-tb-pp v tx-diff-tb-pp
????????????????????????????????????????????????????????????????? maxim integrated products 5 typical operating characteristics ( v cc = 3.3v, t a = +25 n c, eq_ = n.c., using 5gbps q k28.5 pattern, unless otherwise noted.) de_ = n.c, os_ = n.c or 1, v rx-diff-pp = 150mv p-p MAX14972 toc01 eye diagram voltage (mv) 150ps -150ps -100ps -50ps 50ps 100ps 0ps -600 -400 -200 0 200 400 600 -200ps 200ps de_ = n.c, os_ = 0, v rx-diff-pp = 150mv p-p MAX14972 toc02 eye diagram voltage (mv) 150ps -150ps -100ps -50ps 50ps 100ps 0ps 0 200 400 600 -200ps 200ps -600 -400 -200 de_ = n.c, os_ = 0, v rx-diff-pp = 1200mv p-p 150ps -150ps -100ps -50ps 50ps 100ps 0ps -400 -200 -600 0 200 400 600 -200ps 200ps eye diagram voltage (mv) MAX14972 toc04 de_ = n.c, os_ = n.c or 1, v rx-diff-pp = 1200mv p-p 150ps -150ps -100ps -50ps 50ps 100ps 0ps -400 -200 -600 0 200 400 600 -200ps 200ps eye diagram voltage (mv) MAX14972 toc03 MAX14972 dual superspeed usb 3.0 equalizer/redriver
????????????????????????????????????????????????????????????????? maxim integrated products 6 typical operating characteristics (continued) ( v cc = 3.3v, t a = +25 n c, eq_ = n.c., using 5gbps q k28.5 pattern, unless otherwise noted.) differential input return loss vs. frequency MAX14972 toc07 differential input return loss (db) -35 -30 -25 -20 -15 -10 -5 0 -40 frequency (ghz) 2.0 1.5 1.0 0.5 0 2.5 mask differential output return loss vs. frequency MAX14972 toc08 differential output return loss (db) -35 -30 -25 -20 -15 -10 -5 0 -40 frequency (ghz) 2.0 1.5 1.0 0.5 0 2.5 mask de_ = n.c, os_ = 1, v rx-diff-pp = 150mv p-p usb 3.0 host compliance filter MAX14972 toc05 150ps -150ps -100ps -50ps 50ps 100ps 0ps -400mv -200mv -600mv 200mv 400mv 600mv 800mv -800mv -200ps 0mv de_ = n.c, os_ = 1, v rx-diff-pp = 150mv p-p usb 3.0 device compliance filter MAX14972 toc06 150ps -150ps -100ps -50ps 50ps 100ps 0ps -400mv -200mv -600mv 0mv 200mv 400mv 600mv -200ps 800mv -800mv MAX14972 dual superspeed usb 3.0 equalizer/redriver
????????????????????????????????????????????????????????????????? maxim integrated products 7 MAX14972 dual superspeed usb 3.0 equalizer/redriver pin description pin configuration pin name function 1, 13 v cc power-supply input. bypass v cc to gnd with 0.1 f f and 2.2 f f low-esr capacitors in parallel as close as possible to the device. 2 eq1 three-state input equalization control, channel 1. leave eq1 unconnected for default state. 3 de1 three-state transition bit and nontransition bit output amplitude control, channel 1. connect de1 to v cc for default state. 4 os1 two-state transition-bit output amplitude control, channel 1. connect os1 to gnd for default state. 5 enrxd active-high enable. drive enrxd high or leave unconnected for normal operation. drive enrxd low to enter standby state. enrxd has a 400k i (typ) pullup resistor to v cc . 6, 10, 18, 21 gnd ground 7, 24 n.c. no connection. not internally connected. 8 rx1- inverting input, channel 1. ac-couple rx1- with a low-esr 100nf capacitor. 9 rx1+ noninverting input, channel 1. ac-couple rx1+ with a low-esr 100nf capacitor. 11 tx2- inverting output, channel 2. ac-couple tx2- with a low-esr 100nf capacitor. 12 tx2+ noninverting output, channel 2. ac-couple tx2+ with a low-esr 100nf capacitor. 14 cm active-high compliance mode control. drive cm high to force active state. drive cm low or leave unconnected for normal operation. cm has a 400k i (typ) pulldown resistor to gnd. 23 24 22 21 8 7 9 eq1 os1 enrxd gnd 10 v cc eq2 os2 cm gnd v cc 12 tx1+ 45 6 17 18 16 14 13 tx1- *ep n.c. *connect exposed pad (ep) to gnd. gnd rx1+ rx1- n.c. MAX14972 de1 de2 3 15 gnd 20 11 tx2- rx2- 19 12 tx2+ rx2+ tqfn top view +
????????????????????????????????????????????????????????????????? maxim integrated products 8 MAX14972 dual superspeed usb 3.0 equalizer/redriver pin description (continued) functional diagram pin name function 15 os2 two-state transition-bit output amplitude control, channel 2. connect os2 to gnd for default state. 16 de2 three-state transition bit and nontransition bit output amplitude control, channel 2. connect de2 to v cc for default state. 17 eq2 three-state input equalization control, channel 2. leave eq2 unconnected for default state. 19 rx2+ noninverting input, channel 2. ac-couple rx2+ with a low-esr 100nf capacitor. 20 rx2- inverting input, channel 2. ac-couple rx2- with a low-esr 100nf capacitor. 22 tx1+ noninverting output, channel 1. ac-couple tx1+ with a low-esr 100nf capacitor. 23 tx1- inverting output, channel 1. ac-couple tx1- with a low-esr 100nf capacitor. ep exposed pad. internally connected to gnd. connect to a large ground plane to maximize thermal performance. not intended as an electrical connection point. control logic rx1+ rx1- tx2- tx2+ tx1+ tx1- rx2- rx2+ os1 os2 eq1 eq2 de1 de2 enrxd cm v cc gnd MAX14972
????????????????????????????????????????????????????????????????? maxim integrated products 9 MAX14972 dual superspeed usb 3.0 equalizer/redriver table 1. typical input equalization table 4. typical output deemphasis table 2. typical output transition bit amplitude (refer to the electrical characteristics table) table 3. typical output nontransition bit amplitude detailed description the MAX14972 features two identical drivers to support a complete single superspeed usb 3.0 link. programmable equalization and deemphasis on each channel allows for optimal board placement of superspeed trans - ceivers and enables flexibility of front, rear, and side superspeed ports. the device features advanced power management with receiver detection and support for usb 3.0 low-frequency periodic signals (lfps). programmable input equalization input equalization for channel 1 is controlled by eq1, while input equalization for channel 2 is controlled by eq2. each of the two pins, eq1 and eq2, has three equalization settings, which offer flexible compensation for varied input circuit-board trace, connector, or cable losses ( table 1 ). the eq_ three-state inputs interpret voltages below v ih and higher than v il as high imped - ance. set eq_ to 1v, for example, or leave unconnected if the impedance state is required. programmable output deemphasis channel 1 output transition bit amplitude is controlled by the os1 and de1 pins, and the nontransition bit amplitude is controlled only by the de1 pin. channel 2 output transition bit amplitude is controlled by the os2 and de2 pins, and the nontransition bit amplitude is controlled only by the de2 pin. there are six possible output deemphasis states for each of the two channels, which offer flexibility to compensate for varied losses in the output circuit-board traces, connectors, or cables runs ( table 2 , table 3 , and table 4 .) the de_ three-state input interprets voltages below v ih and higher than v il as high impedance. set de_ to 1v, for example, or leave unconnected if a high-impedance state is required. lfps support the device explicitly supports usb 3.0 lfps by detect - ing an idle state at the input and squelching the corre - sponding output to prevent unwanted noise from being redriven. when the differential input lfps signal falls below the 100mv p-p threshold, the device squelches the output. when a differential lfps signal above 300mv p-p (typ) is present at the input, the device turns on the cor - responding output and redrives the signal. the device features an lfps idle entry time of 4ns (typ) and exit time of 4ns (typ) in the active state. advanced power management standby state drive enrxd low to place the device into a low-power standby state. in standby, the inputs are in a common- mode high-impedance state and the device consumes less than 1mw (typ) of power. the entry time to standby is 2 f s (typ), and the exit time is 50 f s (typ). * not connected. * not connected. * not connected. * not connected. eq? equalization (db) n.c.* 0 0 6 1 10 os? amplitude (mv p-p ) n.c.*, 1 1010 to 1270 0 940 to 1210 de? amplitude (mv p-p ) n.c* 640 0 840 1 940 control logic os? = 0 os? = 1, n.c.* de? = 0 -2.5db -3.0db de? = n.c. -3.3db -3.9db de? = 1 -2.2db -2.7db
???????????????????????????????????????????????????????????????? maxim integrated products 10 MAX14972 dual superspeed usb 3.0 equalizer/redriver receiver detection the device features independent receiver detection on each channel. upon initial power-up, if enrxd is high, receiver detection initializes. if the device is in a pow - ered-up state, the receiver detection is initiated on the rising edge of enrxd. during receiver detection, the part remains in low-power mode 23mw (typ) and the outputs and inputs are in a common-mode high-impedance state. the receiver detection repeats every 12ms (typ) until the receiver is detected. the receiver must be detected on both channels to exit the receiver detection state. dynamic power-down the device enters dynamic power-down state when a receiver has been detected and no signal is present at the input. the device exits this state when a signal is detected at the input. the device consumes less than 82.5mw (typ) power in dynamic power-down state. the device enters dynamic power-down after 30 f s idle detection. if no signal is detected for more than 12ms (typ), the part enters receiver detection state. active state the device automatically enters active state after a receiver is detected and an input signal is present. the part can be forced into the active state by setting cm = 1 as shown in table 5 . the device consumes less than 304mw (typ) of power in this state. usb 3.0 compliance mode the MAX14972 features a usb 3.0 compliance mode that forces the device to remain in the active state. the device redrives signals to test the transmitter for volt - age and timing specifications compliance as required by usb 3.0 specifications. drive enrxd high or leave unconnected, and cm high to activate usb 3.0 compli - ance mode. drive enrxd high or leave unconnected, and cm low or leave unconnected for normal operation ( table 5 ). receiver detection and dynamic power-down are disabled in compliance mode (cm = 1), while the part remains in the active state with functional lfps support. applications information layout circuit-board layout and design can significantly affect the performance of the device. use good high-frequency design techniques, including minimizing ground induc - tance and using controlled-impedance transmission lines on data signals. power-supply decoupling capacitors must be placed as close as possible to v cc . always con - nect v cc to a power plane. exposed-pad package the exposed pad, 24-pin tqfn package incorporates features that provide a very low thermal resistance path for heat removal from the ic. the exposed pad on the device must be soldered to the pcb ground plane for proper electrical and thermal performance. for more informa - tion on exposed-pad packages, refer to application note 862: hfan-08.1: thermal considerations of qfn and other exposed-paddle packages . power-supply sequencing caution: do not exceed the absolute maximum ratings because stresses beyond the listed ratings may cause permanent damage to the device. proper power-supply sequencing is recommended for all devices. always apply gnd then v cc before applying signals, especially if the signal is not current limited. table 5. digital control truth table * not connected. + denotes a lead(pb)-free/rohs-compliant package. * ep = exposed pad. ordering information enrxd cm description 0 0 power-down 0 1 power-down 1 or n.c.* 0 or n.c.* normal operation 1 or n.c.* 1 compliance mode (active) part temp range pin-package MAX14972ctg+ 0 n c to +70 n c 24 tqfn-ep*
???????????????????????????????????????????????????????????????? maxim integrated products 11 MAX14972 dual superspeed usb 3.0 equalizer/redriver chip information process: bicmos 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. 24 tqfn-ep t2444+3 21-0139 90-0021
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. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 12 ? 2012 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 0 10/11 initial release 1 3/12 updated electrical characteristics table 14 MAX14972 dual superspeed usb 3.0 equalizer/redriver

▲Up To Search▲

Price & Availability of MAX14972

	To Download MAX14972 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .