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quad pci express equalizer/redriver MAX14950 19-5715; rev 1; 11/12 ordering information general description the MAX14950 is a quad equalizer/redriver designed to improve pci express? (pcie) signal integrity by provid - ing programmable input equalization at its receiver and programmable redrive circuitry. the output circuitry re- establishes deemphasis lost on the board and compen - sates for circuit-board loss. the device permits optimal placement of key pcie components. the device is useful with stripline, microstrip printed circuits, and balanced 100 i cable. the device is tailored for pcie and features electrical idle and receiver detection on each channel. it is optimized for pcie gen iii (8.0gt/s) and gen ii (5.0gt/s) data rates, while still handling gen i (2.5gt/s). the MAX14950 is available in a small, lead-free, 42-pin (3.5mm x 9.0mm) tqfn package for optimal layout and minimal space requirements. the device is specified over the 0 n c to +70 n c operating temperature range. applications servers storage desktop computers/notebook pcs communications switchers features s optimized for generation iii (8.0gt/s) and generation ii (5.0gt/s) with generation i (2.5gt/s) compatibility s receive detection permits completely transparent, software-free operation s equalization permits placement of up to 30in fr4 s pcie gen iii (8.0gt/s)-compliant input/output return loss s electrical idle detection s very low latency: 160ps (typ) propagation delay s random jitter p 0.5ps rms (typ) s deterministic jitter p 10.5ps p-p (typ) s four-level-programmable input equalization s eight-level-programmable output emphasis s on-chip 50 i input/output terminations s single +3.3v supply operation s 5kv human body model (hbm) protection on all pins s space-saving: 3.5mm x 9.0mm tqfn package s pin compatible with max4950 pcie generation ii redriver/equalizer + denotes a lead(pb)-free/rohs-compliant package. * ep = exposed pad. pci express is a registered trademark of pci-sig corp. part temp range pin-package MAX14950cto+ 0 n c to +70 n c 42 tqfn-ep* evaluation kit available for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxims website at www.maximintegrated.com.
2 quad pci express equalizer/redriver stresses beyond those listed under absolute 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. (voltages referenced to gnd.) v cc ........................................................................ -0.3v to +4v all other pins (note 1) ........................... -0.3v to (v cc + 0.3v) continuous current in_p/in_n ..................................... q 30ma peak current in_p/in_n (pulsed for 1 f s, 1% duty cycle) .... q 100ma continuous power dissipation (t a = +70 n c) tqfn (derate 34.5mw/ n c above +70 n c) ................ 2759mw operating temperature range ........................... 0 n c to +70 n c storage temperature range ......................... -55 n c to +150 n c junction temperature ..................................................... +150 n c lead temperature (soldering, 10s) ............................... +300 n c soldering temperature (reflow) ..................................... +260 n c electrical characteristics (v cc = +3.0v to +3.6v, c cl = 200nf coupling capacitor on each output, r l = 50 i on each output, t a = 0 n c to +70 n c, unless oth - erwise noted. typical values are at v cc = +3.3v and t a = +25 n c.) (note 3) absolute maximum ratings note 1: all i/o pins are clamped by internal diodes. package thermal characteristics (note 2) tqfn junction-to-ambient thermal resistance ( q ja ) .......... 29 c/w junction-to-case thermal resistance ( q jc ) ................. 2 c/w note 2: package thermal resistances were obtained using the method described in jedec specification jesd51-7, using a four-lay - er board. for detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial . parameter symbol conditions min typ max units dc performance power-supply range v cc 3.0 3.6 v supply current i cc en = v cc oeq2 = gnd, oeq1 = gnd, oeq0 = gnd 205 260 ma oeq2 = gnd, oeq1 = gnd, oeq0 = v cc 212 270 oeq2 = gnd, oeq1 = v cc , oeq0 = gnd 214 270 oeq2 = gnd, oeq1 = v cc , oeq0 = v cc 247 305 oeq2 = v cc , oeq1 = gnd, oeq0 = gnd 213 270 oeq2 = v cc , oeq1 = gnd, oeq0 = v cc 263 330 oeq2 = v cc, oeq1 = v cc , oeq0 = gnd 276 345 oeq2 = v cc , oeq1 = v cc , oeq0 = v cc 328 410 maxim integrated MAX14950
3 quad pci express equalizer/redriver MAX14950 electrical characteristics (continued) (v cc = +3.0v to +3.6v, c cl = 200nf coupling capacitor on each output, r l = 50 i on each output, t a = 0 n c to +70 n c, unless oth - erwise noted. typical values are at v cc = +3.3v and t a = +25 n c.) (note 3) parameter symbol conditions min typ max units standby current i stby en = gnd oeq2 = gnd, oeq1 = gnd, oeq0 = gnd 113 150 ma oeq2 = gnd, oeq1 = gnd, oeq0 = v cc 122 150 oeq2 = gnd, oeq1 = v cc , oeq0 = gnd 125 155 oeq2 = gnd, oeq1 = v cc , oeq0 = v cc 150 185 oeq2 = v cc , oeq1 = gnd, oeq0 = gnd 122 150 oeq2 = v cc , oeq1 = gnd, oeq0 = v cc 172 210 oeq2 = v cc , oeq1 = v cc , oeq0 = gnd 184 225 oeq2 = v cc , oeq1 = v cc , oeq0 = v cc 237 290 differential input impedance z rx-diff- dc dc 80 100 120 i differential output impedance z tx-diff- dc dc 80 100 120 i common-mode resistance to gnd when input terminations are not powered z rx-high- imp-dc -150mv < v in_cm < 200mv 50 k i common-mode resistance to gnd when input terminations are powered z rx-dc dc 20 25 30 i output short-circuit current (note 4) i tx-short single-ended 90 ma common-mode delta between active and idle states v tx-cm- dc-active- idle-delta 8 mv dc output offset during active state v tx- active- diff-dc |(v out_p - v out_n )| 75 mv dc output offset during electrical idle v tx-idle- diff-dc |(v out_p - v out_n )| 75 mv maxim integrated
4 quad pci express equalizer/redriver electrical characteristics (continued) (v cc = +3.0v to +3.6v, c cl = 200nf coupling capacitor on each output, r l = 50 i on each output, t a = 0 n c to +70 n c, unless oth - erwise noted. typical values are at v cc = +3.3v and t a = +25 n c.) (note 3) parameter symbol conditions min typ max units ac performance (note 4) differential input return loss rl rx-diff f = 0.05ghz to 1.25ghz 10 db f = 1.25ghz to 2.5ghz 8 f = 2.5ghz to 4ghz 5 common-mode input return loss rl rx-cm f = 0.05ghz to 2.5ghz 6 db f = 2.5ghz to 4ghz 4 differential output return loss rl tx-diff f = 0.05ghz to 1.25ghz 10 db f = 1.25ghz to 2.5ghz 8 f = 2.5ghz to 4ghz 4 common-mode output return loss rl tx-cm f = 0.05ghz to 2.5ghz 6 db f = 2.5ghz to 4ghz 4 redriver operation differential input-signal range v rx-diff- pp 100 1200 mv p-p full-swing differential output voltage (no deemphasis) v tx-diff- pp |(v out_p - v out_n )|, oeq2 = gnd, oeq1 = gnd, oeq0 = gnd 800 1300 mv p-p output deemphasis ratio, 0db v tx-de- ratio-0db oeq2 = gnd, oeq1 = gnd, oeq0 = gnd, figure 1 0 db output deemphasis ratio, 3.5db v tx-de- ratio- 3.5db oeq2 = gnd, oeq1 = gnd, oeq0 = v cc, figure 1 3.5 db output deemphasis ratio, 6db v tx-de- ratio-6db oeq2 = gnd, oeq1 = v cc , oeq0 = gnd, figure 1 6 db output deemphasis ratio, 6db with higher amplitude v tx-de-ha- ratio-6db oeq2 = gnd, oeq1 = v cc , oeq0 = v cc, figure 1 6 db output deemphasis ratio, 3.5db with preshoot v tx-de- ps-ratio- 3.5db oeq2 = v cc , oeq1 = gnd, oeq0 = gnd, figure 1 3.5 db output deemphasis ratio, 6db with preshoot v tx-de-ps- ratio-6db oeq2 = v cc , oeq1 = gnd, oeq0 = v cc , figure 1 6 db output deemphasis ratio, 9db with preshoot v tx-de-ps- ratio-9db oeq2 = v cc , oeq1 = v cc , oeq0 = gnd, figure 1 9 db output deemphasis ratio, 9db with preshoot with higher amplitude v tx-de-ps- ha-ratio- 9db oeq2 = v cc , oeq1 = v cc , oeq0 = v cc , figure 1 9 db input equalization, 5db v rx-eq- 5db ineq1 = gnd, ineq0 = gnd (note 5) 5 db input equalization, 8db v rx-eq- 8db ineq1 = gnd, ineq0 = v cc (note 5) 8 db input equalization, 12db v rx-eq- 12db ineq1 = v cc , ineq0 = gnd (note 5) 12 db maxim integrated MAX14950
5 quad pci express equalizer/redriver MAX14950 note 3: all units are 100% production tested at t a = +70 n c. specifications for all temperature limits are guaranteed by design. note 4: guaranteed by design, unless otherwise noted. note 5: equivalent to same amount of deemphasis driving the input. note 6: rise and fall times are measured using 20% and 80% levels. electrical characteristics (continued) (v cc = +3.0v to +3.6v, c cl = 200nf coupling capacitor on each output, r l = 50 i on each output, t a = 0 n c to +70 n c, unless oth - erwise noted. typical values are at v cc = +3.3v and t a = +25 n c.) (note 3) parameter symbol conditions min typ max units input equalization, 16db v rx-eq- 16db ineq1 = v cc, ineq0 = v cc (note 5) 16 db ac performance (note 4) output common-mode voltage swing peak-to-peak v tx-cm- ac-pp max(v out_p + v out_n )/2 - min(v out_p + v out_n )/2 100 mv p-p propagation delay t pd 120 160 240 ps rise/fall time t tx-rise- fall (note 6) 20 ps rise/fall time mismatch t tx-rf- mismatch (note 6) 5 ps deterministic jitter t tx-dj-dd k28.5 pattern, ac-coupled, r l = 50 i , data rate = 8gt/s 10.5 23.5 ps p-p random jitter t tx-rj-dd d10.2 pattern, no deemphasis, no preshoot, data rate = 8gt/s 0.5 1.5 ps rms electrical idle entry delay t tx-idle- set-to- idle from input to output, d10.2 pattern, data rate = 1gt/s 5 8 ns electrical idle exit delay t tx-idle- to-diff- data from input to output, d10.2 pattern, data rate = 1gt/s 5 8 ns electrical idle detect threshold v tx-idle- thresh d10.2 pattern, data rate = 1gt/s (note 3) 65 112 175 mv p-p d10.2 pattern, data rate = 1gt/s to 8gt/s 112 output voltage during electrical idle (ac) v tx-idle- diff-ac-p |(v out_p - v out_n )| 20 mv p-p receiver detection pulse amplitude v tx-rcv- detect voltage change in positive direction 600 mv receiver detection pulse width 150 ns receiver detection retry period 300 ns control logic input logic-level low v il 0.6 v input logic-level high v ih 1.4 v input logic hysteresis v hyst 0.1 v input pulldown resistance r pd 200 250 k i esd protection esd voltage human body model 5 kv maxim integrated
6 quad pci express equalizer/redriver figure 1. illustration of output deemphasis typical operating characteristics (t a = +25c, unless otherwise noted.) v low_p-p v high_p-p v high _ p- p de (d b) = 20 log v lo w_ p-p ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 0, oeq1 = 0, oeq0 = 0, data rate = 5gt/s voltage (mv) 600 400 200 0 -200 -400 -600 -200 -150 -100 -50 05 0 100 150 MAX14950 toc01 (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 0, oeq1 = 0, oeq0 = 1, data rate = 5gt/s voltage (mv) 600 400 200 0 -200 -400 -600 -200 -150 -100 -50 05 0 100 150 MAX14950 toc02 (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 0, oeq1 = 1, oeq0 = 0, data rate = 5gt/s voltage (mv) 600 400 200 0 -200 -400 -600 -200 -150 -100 -50 05 0 100 150 MAX14950 toc03 (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 0, oeq1 = 1, oeq0 = 1, data rate = 5gt/s voltage (mv) 600 400 200 0 -200 -400 -600 -200 -150 -100 -50 05 0 100 150 MAX14950 toc04 (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 1, oeq1 = 0, oeq0 = 0, data rate = 5gt/s voltage (mv) 600 400 200 0 -200 -400 -200 -150 -100 -50 05 0 100 150 MAX14950 toc05 (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 1, oeq1 = 0, oeq0 = 1, data rate = 5gt/s voltage (mv) 600 400 200 0 -200 -400 -600 -200 -150 -100 -50 05 0 100 150 MAX14950 toc06 (ps) maxim integrated MAX14950
7 quad pci express equalizer/redriver MAX14950 typical operating characteristics (continued) (t a = +25c, unless otherwise noted.) ineq1 = 1, ineq0 = 1, v in = 500mv p-p , oeq2 = oeq1 = oeq0 = 0, 24in microstrip on input, data rate = 5gt/s MAX14950 toc12 -600 -400 -200 200 0 400 600 150 100 -150 -100 -50 05 0 -200 voltage (mv) (ps) ineq1 = 1, ineq0 = 0, v in = 500mv p-p , oeq2 = oeq1 = oeq0 = 0, 18in microstrip on input, data rate = 5gt/s MAX14950 toc11 -600 -400 -200 200 0 400 600 150 100 -150 -100 -50 05 0 -200 voltage (mv) (ps) ineq1 = 0, ineq0 = 1, v in = 500mv p-p , oeq2 = oeq1 = oeq0 = 0, 12in microstrip on input, data rate = 5gt/s voltage (mv) 600 400 200 0 -200 -400 -600 -200 -150 -100 -50 05 0 100 150 MAX14950 toc10 (ps) ineq1 = 0, ineq0 = 1, v in = 500mv p-p , oeq2 = oeq1 = oeq0 = 0, 6in microstrip on input, data rate = 5gt/s voltage (mv) 600 400 200 0 -200 -400 -600 -200 -150 -100 -50 05 0 100 150 MAX14950 toc09 (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 1, oeq1 = 1, oeq0 = 1, data rate = 5gt/s voltage (mv) 600 400 200 0 -200 -400 -600 -200 -150 -100 -50 05 0 100 150 MAX14950 toc08 (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 1, oeq1 = 0, oeq0 = 1, data rate = 5gt/s voltage (mv) 600 400 200 0 -200 -400 -600 -200 -150 -100 -50 05 0 100 150 MAX14950 toc07 (ps) maxim integrated
8 quad pci express equalizer/redriver MAX14950 typical operating characteristics (continued) (t a = +25c, unless otherwise noted.) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 1, oeq1 = 0, oeq0 = 1, output after 19in stripline, data rate = 5gt/s MAX14950 toc18 -300 -100 -200 300 100 200 0 150 100 -150 -100 -50 05 0 -200 voltage (mv) (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 0, oeq1 = 1, oeq0 = 1, output after 19in stripline, data rate = 5gt/s MAX14950 toc17 -300 -100 -200 300 100 200 0 150 100 -150 -100 -50 05 0 -200 voltage (mv) (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 1, oeq1 = 0, oeq0 = 1, output after 19in stripline, data rate = 5gt/s MAX14950 toc16 -300 -100 -200 300 100 200 0 150 100 -150 -100 -50 05 0 -200 voltage (mv) (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 1, oeq1 = 1, oeq0 = 0, output after 19in stripline, data rate = 5gt/s MAX14950 toc15 -200 -250 -100 -150 -50 150 50 100 0 200 250 150 100 -150 -100 -50 05 0 -200 voltage (mv) (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 1, oeq1 = 1, oeq0 = 1, output after 19in stripline, data rate = 5gt/s MAX14950 toc14 -300 -200 -100 100 0 200 300 150 100 -150 -100 -50 05 0 -200 voltage (mv) (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 0, oeq1 = 0, oeq0 = 1, output after 19in stripline, data rate = 5gt/s MAX14950 toc13 -300 -400 -200 -100 100 0 200 300 150 100 -150 -100 -50 05 0 -200 voltage (mv) (ps) maxim integrated
9 quad pci express equalizer/redriver MAX14950 typical operating characteristics (continued) (t a = +25c, unless otherwise noted.) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 0, oeq1 = 1, oeq0 = 1, data rate = 8gt/s MAX14950 toc24 voltage (mv) 100 50 0 -50 -100 -400 -200 0 200 400 600 -600 (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 0, oeq1 = 1, oeq0 = 0, data rate = 8gt/s MAX14950 toc23 voltage (mv) 100 50 0 -50 -100 -400 -200 0 200 400 600 -600 (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 0, oeq1 = 0, oeq0 = 1, data rate = 8gt/s MAX14950 toc22 voltage (mv) 100 50 0 -50 -100 -400 -200 0 200 400 600 -600 (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 0, oeq1 = 0, oeq0 = 0, data rate = 8gt/s MAX14950 toc21 voltage (mv) 100 50 0 -50 -100 -400 -200 0 200 400 600 -600 (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 0, oeq1 = 0, oeq0 = 0, output after 19in stripline, data rate = 5gt/s MAX14950 toc20 -500 -200 -100 -300 -400 500 100 200 400 300 0 150 100 -150 -100 -50 05 0 -200 voltage (mv) (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 0, oeq1 = 1, oeq0 = 0, output after 19in stripline, data rate = 5gt/s MAX14950 toc19 -250 -100 -50 -150 -200 250 50 100 200 150 0 150 100 -150 -100 -50 05 0 -200 voltage (mv) (ps) maxim integrated
10 quad pci express equalizer/redriver MAX14950 typical operating characteristics (continued) (t a = +25c, unless otherwise noted.) ineq1 = 0, ineq0 = 1, v in = 500mv p-p , oeq2 = oeq1 = oeq0 = 0, 12in microstrip on input, data rate = 8gt/s MAX14950 toc30 voltage (mv) 100 50 0 -50 -100 -400 -200 0 200 400 600 -600 (ps) ineq1 = 0, ineq0 = 0, v in = 500mv p-p , oeq2 = oeq1 = oeq0 = 0, 6in microstrip on input, data rate = 8gt/s MAX14950 toc29 voltage (mv) 100 50 0 -50 -100 -400 -200 0 200 400 600 -600 (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 1, oeq1 = 1, oeq0 = 1, data rate = 8gt/s MAX14950 toc28 voltage (mv) 100 50 0 -50 -100 -400 -200 0 200 400 800 600 -600 (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 1, oeq1 = 1, oeq0 = 0, data rate = 8gt/s MAX14950 toc27 voltage (mv) 100 50 0 -50 -100 -400 -200 0 200 400 600 -600 (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 1, oeq1 = 0, oeq0 = 1, data rate = 8gt/s MAX14950 toc26 voltage (mv) 100 50 0 -50 -100 -400 -200 0 200 400 600 -600 (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 1, oeq1 = 0, oeq0 = 0, data rate = 8gt/s MAX14950 toc25 voltage (mv) 100 50 0 -50 -100 -400 -200 0 200 400 600 -600 (ps) maxim integrated
11 quad pci express equalizer/redriver MAX14950 typical operating characteristics (continued) (t a = +25c, unless otherwise noted.) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 1, oeq1 = 1, oeq0 = 1, output after 19in stripline, data rate = 8gt/s 300 -300 -100 -50 05 0 100 200 -200 10 -100 0 voltage (mv) MAX14950 toc34 (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 0, oeq1 = 0, oeq0 = 1, output after 19in stripline, data rate = 8gt/s 300 -300 -100 -50 05 0 100 200 -200 10 -100 0 voltage (mv) MAX14950 toc33 (ps) ineq1 = 1, ineq0 = 1, v in = 500mv p-p , oeq2 = oeq1 = oeq0 = 0, 24in microstrip on input, data rate = 8gt/s 600 -600 -100 -50 05 0 100 400 -400 200 -200 0 voltage (mv) MAX14950 toc32 (ps) ineq1 = 1, ineq0 = 0, v in = 500mv p-p , oeq2 = oeq1 = oeq0 = 0, 18in microstrip on input, data rate = 8gt/s 600 -600 -100 -50 05 0 100 MAX14950 toc31 400 -400 200 -200 0 voltage (mv) (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 1, oeq1 = 0, oeq0 = 1, output after 19in stripline, data rate = 8gt/s 300 -300 -100 -50 05 0 100 MAX14950 toc36 200 -200 10 -100 0 voltage (mv) (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 1, oeq1 = 1, oeq0 = 0, output after 19in stripline, data rate = 8gt/s 250 -250 -100 -50 05 0 100 200 -200 -150 150 -100 -50 0 100 50 voltage (mv) MAX14950 toc35 (ps) maxim integrated
12 quad pci express equalizer/redriver MAX14950 typical operating characteristics (continued) (t a = +25c, unless otherwise noted.) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 0, oeq1 = 0, oeq0 = 0, output after 19in stripline, data rate = 8gt/s 500 -500 -100 -50 05 0 100 400 -400 -300 300 -200 -100 0 200 100 voltage (mv) MAX14950 toc40 (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 0, oeq1 = 1, oeq0 = 0, output after 19in stripline, data rate = 8gt/s 250 -250 -100 -50 05 0 100 200 -200 -150 150 -100 -50 0 100 50 voltage (mv) MAX14950 toc39 (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 1, oeq1 = 0, oeq0 = 0, output after 19in stripline, data rate = 8gt/s 300 -300 -100 -50 05 0 100 200 -200 10 -100 0 voltage (mv) MAX14950 toc38 (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 1, oeq1 = 1, oeq0 = 0, output after 19in stripline, data rate = 8gt/s 300 -300 -100 -50 05 0 100 200 -200 10 -100 0 voltage (mv) MAX14950 toc37 (ps) maxim integrated
13 quad pci express equalizer/redriver MAX14950 pin description pin configuration top view tqfn 18 19 20 21 ineq1 ineq0 oeq1 oeq0 42 + 41 40 39 i.c. oeq2 rxdet en 1 2345678 91 01 11 21 31 41 51 61 7 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 in2n gnd in3p in3n gnd v cc in2p gnd v cc gnd in1n in1p gnd in0n in0p gnd v cc out2n gnd out3p out3n gnd v cc out2p gnd v cc gnd out1n out1p gnd out0n out0p gnd v cc *connect exposed pad (ep) to gnd. *ep MAX14950 pin name function 1, 9, 17, 22, 30, 38 v cc power-supply input. bypass v cc to gnd with 1 f f and 0.1 f f capacitors in parallel as close as possible to the device. 2, 5, 8, 10, 13, 16, 23, 26, 29, 31, 34, 37 gnd ground 3 in0p noninverting input, channel 0 4 in0n inverting input, channel 0 6 in1p noninverting input, channel 1 7 in1n inverting input, channel 1 11 in2p noninverting input, channel 2 12 in2n inverting input, channel 2 14 in3p noninverting input, channel 3 15 in3n inverting input, channel 3 18 ineq1 input equalization control msb. ineq1 has a 250k i (typ) internal pulldown resistor. 19 ineq0 input equalization control lsb. ineq0 has a 250k i (typ) internal pulldown resistor. 20 oeq1 output deemphasis control bit 1. oeq1 has a 250k i (typ) internal pulldown resistor. 21 oeq0 output deemphasis control lsb. oeq0 has a 250k i (typ) internal pulldown resistor. 24 out3n inverting output, channel 3 25 out3p noninverting output, channel 3 27 out2n inverting output, channel 2 28 out2p noninverting output, channel 2 32 out1n inverting output, channel 1 33 out1p noninverting output, channel 1 maxim integrated
14 quad pci express equalizer/redriver pin description (continued) functional diagram detection and control circuit out0p out0n out1p out1n out2p out2n out3p out3n in0p in0n in1p in1n in2p in2n in3p in3n en rxdet ineq[0:1] oeq[0:2] MAX14950 pin name function 35 out0n inverting output, channel 0 36 out0p noninverting output, channel 0 39 en enable input. drive en low for standby mode. drive en high for normal mode. en has a 250k i (typ) internal pulldown resistor. 40 rxdet receiver detection control bit. drive rxdet high to initiate receiver detection. drive rxdet low for normal mode. rxdet has a 250k i (typ) internal pulldown resistor. 41 oeq2 output deemphasis control msb. oeq2 has a 250k i (typ) internal pulldown resistor. 42 i.c. internally connected ep exposed pad. internally connected to gnd. connect ep to a large ground plane to maximize thermal performance as well as good ground conductivity to the device. maxim integrated MAX14950
15 quad pci express equalizer/redriver MAX14950 table 2. output deemphasis/preshoot detailed description the MAX14950 quad equalizer/redriver is designed to support gen iii (8.0gt/s), gen ii (5.0gt/s), and gen i (2.5gt/s) pcie data rates. the device contains four identical drivers with electrical idle/receive detect on each lane and equalization/deemphasis/preshoot to compensate for circuit-board loss. programmable input equalization circuitry reduces deterministic jitter, improving signal integrity. the device output features a programmable output deemphasis/preshoot, permitting optimal placement of key pcie components and longer runs of stripline, microstrip, or cable. programmable input equalization programmable input equalization is controlled by two bits: ineq1 and ineq0 (table 1). programmable output deemphasis/ preshoot programmable output deemphasis is controlled by three bits: oeq2, oeq1, and oeq0 for deemphasis/preshoot ratios of 0db, 3.5db, 6db, and 9db (table 2). receiver detection the device features receiver detection on each channel. upon initial power-up, if en is high, receiver detection initializes. receiver detection can also be initiated on a rising or falling edge of the rxdet input when en is high. during this time, the device remains in low-power standby mode and the outputs are disabled, despite the logic-high state of en. until a channel has detected a receiver, the receiver detection repeats indefinitely on each channel. if a channel detects a receiver, the other channels are limited to retries for 100ms (typ). for each channel upon receiver detection, input common-mode termination and electrical idle detection are enabled (table 3). electrical idle detection the device features electrical idle detection to prevent unwanted noise from being redriven at the output. when the device detects that the differential input has fallen below the v tx-idle-thresh low limit, it squelches the output. for differential input signals that are above v tx- idle-thresh high limit, the device turns on the output and redrives the signal. there is little variation in output common-mode voltage between electrical idle and redrive modes. table 1. input equalization table 3. receiver detection input function x = dont care. oeq2 oeq1 oeq0 output deemphasis/ preshoot ratio (db) 0 0 0 0 0 0 1 3.5 0 1 0 6 0 1 1 6 (peak-to-peak swing is 1.2v) 1 0 0 3.5 1 0 1 6 1 1 0 9 (peak-to-peak swing is 0.9v) 1 1 1 9 (peak-to-peak swing is 1.0v) ineq1 ineq0 input equalization (db) 0 0 5 0 1 8 1 0 12 1 1 16 rxdet en description x 0 receiver detection is inactive. x 1 following a rising edge of en sig - nal, indefinite retry until receiver detects at least one channel. retries stop after 100ms (typ) if any channel receiver is detected. rising/falling edge 1 initiates receiver detection. maxim integrated
16 quad pci express equalizer/redriver figure 2. typical application diagram applications information figure 2 shows a typical application with two MAX14950s, both residing on the main board, with input and output equalization set individually for optimal performance. the MAX14950 rx equalizer is set to receive a degraded signal coming from a remote board through two sets of connectors and a midplane stripline. the output of the rx section has little or no output equalization. the tx section takes a high-quality signal and provides boost to the output (deemphasis). 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 should also be placed as close as possible to v cc . always connect v cc to a power plane. it is recommended to run receive and transmit signals on different layers to minimize crosstalk. exposed-pad package the exposed-pad, 42-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 circuit-board ground plane for proper thermal performance and good ground connectivity. for more information 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 rat - ings 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 apply - ing signals, especially if the signal is not current limited. chip information process: bicmos package information for the latest package outline information and land patterns (footprints), go to www.maximintegrated.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. 4 differential pairs rx tx midplane remote board 4 differential pairs connectors pcie tx rx main board pcie MAX14950 MAX14950 package type package code outline no. land pattern no. 42 tqfn-ep t423590+1 21-0181 90-0078 maxim integrated MAX14950
maxim integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim integrated product. no circuit patent licenses are implied. maxim integrated 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 160 rio robles, san jose, ca 95134 usa 1-408-601-1000 17 ? 2012 maxim integrated products, inc. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. quad pci express equalizer/redriver MAX14950 revision history revision number revision date description pages changed 0 12/10 initial release 1 11/12 removed military application information; updated electrical characteristics table, typical operating characteristics , pin configuration , and pin description . 1, 3C16

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