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max14954 ruggedized quad pcie redriver with equalization and extended temperature operation general description the max14954 is a quad equalizer/redriver designed to improve pci express? (pcie) signal integrity by providing programmable input equalization at its receiver and pro - grammable redrive circuitry. the output circuitry reestab - lishes deemphasis lost on the board and compensates for circuit-board loss. the device permits optimal placement of key pcie components. the device is useful with strip - line, microstrip printed circuits, and balanced 100 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 max14954 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 -40 n c to +85 n c extended operating temperature range. applications industrial/embedded pcs computer on modules carrier boards test equipment rack server industrial pcs medical equipment beneits and features fully integrated for ease of use and design flexibility ? optimized for pcie gen iii (8.0gt/s), gen ii (5.0gt/s); gen i (2.5 gt/s) compatible ? four levels of input equalization up to 16db ? eight levels of output deemphasis up to 9db high level of performance to overcome noise in lossy channels ? random jitter: 0.5ps rms (typ) ? deterministic jitter: 10.5ps p-p (typ) ? equalization permits placement up to 30in fr4 robust solution for harsh environments ? industrial temperature rated: -40c to + 85c ? 5kv human body model (hbm) protection on all pins ? housed in a flow-through (3.5mm x 9.5mm) tqfn package for resistance to vibration/ shocks 19-6531; rev 0; 11/12 ordering information appears at end of data sheet. for related parts and recommended products to use with this part, refer to www.maximintegrated.com/max14954.related . pci express is a registered trademark of pci-sig corp. evaluation kit available downloaded from: http:///
max14954 ruggedized quad pcie redriver with equalization and extended temperature operation www.maximintegrated.com maxim integrated 2 electrical characteristics (v cc = +3.0v to +3.6v, c cl = 200nf coupling capacitor on each output, r l = 50 on each output, t a = -40c to +85c, unless otherwise noted. typical values are at v cc = +3.3v and t a = +25c.) (note 3) 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.maximintegrated.com/thermal-tutorial . 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. package thermal characteristics (note 2) absolute maximum ratings (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 ........................................ 30ma peak current in_p/in_n (pulsed for 1s, 1% duty cycle) .................................. 100ma continuous power dissipation (t a = +70c) tqfn (derate 34.5mw/c above +70c) .................. 2759mw operating temperature range ........................... -40c to +85c storage temperature range ............................ -55c to +150c junction temperature ...................................................... +150c lead temperature (soldering, 10s) ................................. +300c soldering temperature (reflow) ....................................... +260c note 1: all i/o pins are clamped by internal diodes. tqfn junction-to-ambient thermal resistance ( ja ) .......... 29c/w junction-to-case thermal resistance ( jc ) ................. 2c/w parameter symbol conditions min typ max units dc performancepower-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 downloaded from: http:///
max14954 ruggedized quad pcie redriver with equalization and extended temperature operation www.maximintegrated.com maxim integrated 3 electrical characteristics (continued) (v cc = +3.0v to +3.6v, c cl = 200nf coupling capacitor on each output, r l = 50 on each output, t a = -40c to +85c, unless otherwise noted. typical values are at v cc = +3.3v and t a = +25c.) (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 ? differential output impedance z tx-diff- dc dc 80 100 120 ? common-mode resistance to gnd when input terminations are not powered z rx-high- imp-dc -150mv < v in_cm < 200mv 50 k? common-mode resistance to gnd when input terminations are powered z rx-dc dc 20 25 30 ? output short-circuit current i tx-short single-ended (note 4) 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 )| 100 mv dc output offset during electrical idle v tx-idle- diff-dc |(v out_p - v out_n )| 100 mv downloaded from: http:///
max14954 ruggedized quad pcie redriver with equalization and extended temperature operation www.maximintegrated.com maxim integrated 4 electrical characteristics (continued) (v cc = +3.0v to +3.6v, c cl = 200nf coupling capacitor on each output, r l = 50 on each output, t a = -40c to +85c, unless oth - erwise noted. typical values are at v cc = +3.3v and t a = +25c.) (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 1350 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 downloaded from: http:///
max14954 ruggedized quad pcie redriver with equalization and extended temperature operation www.maximintegrated.com maxim integrated 5 electrical characteristics (continued) (v cc = +3.0v to +3.6v, c cl = 200nf coupling capacitor on each output, r l = 50 on each output, t a = -40c to +85c, unless oth - erwise noted. typical values are at v cc = +3.3v and t a = +25c.) (note 3) note 3: all units are 100% production tested at t a = +85c. 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. 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?, 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 ? esd protection esd voltage human body model 5 kv downloaded from: http:///
max14954 ruggedized quad pcie redriver with equalization and extended temperature operation www.maximintegrated.com maxim integrated 6 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 lo g 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 400200 0 -200-400 -600 -200 -150 -100 -50 05 0 100 150 max14954 toc01 (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 0, oeq1 = 0, oeq0 = 1, data rate = 5gt/s voltage (mv) 600 400200 0 -200-400 -600 -200 -150 -100 -50 05 0 100 150 max14954 toc02 (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 0, oeq1 = 1, oeq0 = 0, data rate = 5gt/s voltage (mv) 600 400200 0 -200-400 -600 -200 -150 -100 -50 05 01 00 150 max14954 toc03 (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 0, oeq1 = 1, oeq0 = 1, data rate = 5gt/s voltage (mv) 600 400200 0 -200-400 -600 -200 -150 -100 -50 05 0 100 150 max14954 toc04 (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 1, oeq1 = 0, oeq0 = 0, data rate = 5gt/s voltage (mv) 600 400200 0 -200-400 -200 -150 -100 -50 05 0 100 150 max14954 toc05 (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 1, oeq1 = 0, oeq0 = 1, data rate = 5gt/s voltage (mv) 600 400200 0 -200-400 -600 -200 -150 -100 -50 05 0 100 150 max14954 toc06 (ps) downloaded from: http:///
max14954 ruggedized quad pcie redriver with equalization and extended temperature operation maxim integrated 7 www.maximintegrated.com typical operating characteristics (continued) (t a = +25c, unless otherwise noted.) ineq0 = 0, ineq1 = 0, v in = 500mv p-p , with 19in stripline, 0eq0 = oeq1 = oeq2 = 0, data rate = 5gt/s max14954 toc12 -600 -400 -200 200 0 400 600 150 100 -150 -100 -50 05 0 -200 voltage (mv) (ps) ineq0 = 1, ineq1 = 1, v in = 500mv p-p , with 19in stripline, 0eq0 = oeq1 = oeq2 = 0, data rate = 5gt/s max14954 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 , 0eq2 = oeq1 = oeq0 = 0, 12in microstrip on input, data rate = 5gt/s eye diagram voltage (mv) 600 400200 0 -200-400 -600 -200 -150 -100 -50 05 0 100 150 max14954 toc10 (ps) ineq1 = 0, ineq0 = 1, v in = 500mv p-p , 0eq2 = oeq1 = oeq0 = 0, 6in microstrip on input, data rate = 5gt/s eye diagram voltage (mv) 600 400200 0 -200-400 -600 -200 -150 -100 -50 05 0 100 150 max14954 toc09 (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 1, oeq1 = 1, oeq0 = 1, data rate = 5gt/s voltage (mv) 600 400200 0 -200-400 -600 -200 -150 -100 -50 05 0 100 150 max14954 toc08 (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 1, oeq1 = 0, oeq0 = 1, data rate = 5gt/s voltage (mv) 600 400200 0 -200-400 -600 -200 -150 -100 -50 05 0 100 150 max14954 toc07 (ps) downloaded from: http:///
max14954 ruggedized quad pcie redriver with equalization and extended temperature operation maxim integrated 8 www.maximintegrated.com 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 max14954 toc18 -300 -100-200 300100 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 max14954 toc17 -300 -100-200 300100 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 max14954 toc16 -300 -100-200 300100 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 max14954 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 max14954 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 max14954 toc13 -300-400 -200 -100 100 0 200 300 150 100 -150 -100 -50 05 0 -200 voltage (mv) (ps) downloaded from: http:///
max14954 ruggedized quad pcie redriver with equalization and extended temperature operation maxim integrated 9 www.maximintegrated.com 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 max14954 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 max14954 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 max14954 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 max14954 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 max14954 toc20 -500 -200 -100-300 -400 500100 200 400300 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 max14954 toc19 -250 -100 -50 -150-200 250 50 100 200150 0 150 100 -150 -100 -50 05 0 -200 voltage (mv) (ps) downloaded from: http:///
max14954 ruggedized quad pcie redriver with equalization and extended temperature operation maxim integrated 10 www.maximintegrated.com 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 max14954 toc30 eye diagram 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 max14954 toc29 eye diagram 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 max14954 toc28 voltage (mv) 100 50 0 -50 -100 -400 -200 0 200 400 800600 -600 (ps) ineq0 = ineq1 = 0, v in = 200mv p-p , 0eq2 = 1, oeq1 = 1, oeq0 = 0, data rate = 8gt/s max14954 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 max14954 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 max14954 toc25 voltage (mv) 100 50 0 -50 -100 -400 -200 0 200 400 600 -600 (ps) downloaded from: http:///
max14954 ruggedized quad pcie redriver with equalization and extended temperature operation maxim integrated 11 www.maximintegrated.com 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) max14954 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) max14954 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 -60 -40 -20 02 04 06 0 400 -400 200 -200 0 eye diagram voltage (mv) max14954 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 max14954 toc31 400 -400 200 -200 0 eye diagram 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 max14954 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) max14954 toc35 (ps) downloaded from: http:///
max14954 ruggedized quad pcie redriver with equalization and extended temperature operation maxim integrated 12 www.maximintegrated.com 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 200100 voltage (mv) max14954 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) max14954 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) max14954 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) max14954 toc37 (ps) downloaded from: http:///
max14954 ruggedized quad pcie redriver with equalization and extended temperature operation www.maximintegrated.com maxim integrated 13 pin descriptions pin coniguration pin name function 1, 9, 17, 22, 30, 38 v cc power-supply input. bypass v cc to gnd with 1f and 0.1f 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? (typ) internal pulldown resistor. 19 ineq0 input equalization control lsb. ineq0 has a 250k? (typ) internal pulldown resistor. 20 oeq1 output deemphasis control bit 1. oeq1 has a 250k? (typ) internal pulldown resistor. 21 oeq0 output deemphasis control lsb. oeq0 has a 250k? (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 top view tqfn 18 19 20 21 ineq1 ineq0 oeq1 oeq0 42 + 41 40 39 i.c. oeq2 rxdet en 1 23456789 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 in2n gnd in3p in3n gnd v cc in2p gnd v cc gnd in1n in1p gnd in0n in0p gnd v cc out2ngnd 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 max14954 downloaded from: http:///
max14954 ruggedized quad pcie redriver with equalization and extended temperature operation www.maximintegrated.com maxim integrated 14 pin description (continued)functional diagram 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? (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? (typ) internal pulldown resistor. 41 oeq2 output deemphasis control msb. oeq2 has a 250k? (typ) internal pulldown resistor. 42 i.c. internally connected pin 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. out0p max14954 out0nout1p out1n out2p out2n out3p out3n in0p in0n in1p in1n in2p in2n in3p in3n detection and control circuit en rxdet ineq[0:1] oeq[0:2] downloaded from: http:///
max14954 ruggedized quad pcie redriver with equalization and extended temperature operation www.maximintegrated.com maxim integrated 15 table 1. input equalization table 2. output deemphasis/preshoot table 3. receiver detection input function detailed description the max14954 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 iden - tical 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 place - ment 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. x = dont care. ineq1 ineq0 input equalization (db) 0 0 5 0 1 8 1 0 12 1 1 16 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) rxdet en description x 0 receiver detection is inactive. x 1 following a rising edge of the en signal, indeinite retries 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. downloaded from: http:///
max14954 ruggedized quad pcie redriver with equalization and extended temperature operation www.maximintegrated.com maxim integrated 16 figure 2. typical application diagram applications information figure 2 shows a typical application with two max14954s, both residing on the main board with input and output equalization set individually for optimal performance. the max14954 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 sec - tion 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 device. 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 pack - ages, 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 can 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. 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. chip information process: bicmos + denotes a lead(pb)-free/rohs-compliant package. * ep = exposed pad. ordering information package type package code outline no. land pattern no. 42 tqfn-ep t423590+1 21-0181 90-0078 part temp range pin-package MAX14954ETO+ -40c to +85c 42 tqfn-ep* 4 differential pa irs rxtx midplane remote board 4 differential pa irs connectors pcie tx rx main board pcie max14954max14954 downloaded from: http:///
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 speciications without n otice 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 and the maxim integrated logo are trademarks of maxim integrated products, inc. max14954 ruggedized quad pcie redriver with equalization and extended temperature operation ? 2012 maxim integrated products, inc. 17 revision history revision number revision date description pages changed 0 11/12 initial release for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com. downloaded from: http:///

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