1 PI6C557-01BQ block diagram phase l ock lo op crystal driver vdd gnd x1/c lk x2 25 mhz c ry stal or cl ock control logic ss1 clk clk r r (iref) pulling ca pacitor s pin confguration (16-pin tqfn) 1 13 5 9 gnd x1 x2 nc vdda gnd clk clk gnd ss1 iref nc nc vdd nc nc description te PI6C557-01BQ is a spread spectrum clock generator compli - ant to pci express? 3.0 and ethernet requirements. te device is used for automotive systems. te PI6C557-01BQ provides one diferential (hcsl) or lvds spread spectrum output. using pericom's patented phase-locked loop (pll) techniques, the device takes a 25mhz crystal input and produces one pair of diferential outputs (hcsl) at 100mhz. it also provides spread selection of -0.5% and no spread. features ? ? pcie? 3.0 compliant p hase jitter - 0.45ps rms (high freq. typ.) ? ? lvds compatible output ? ? supply voltage of 3.3v 10% ? ? 25mhz crystal or clock input frequency ? ? hcsl outputs, 0.8v current mode diferential pair ? ? jitter 35ps cycle-to-cycle (typ) ? ? spread of -0.5% and no spread ? ? industrial temperature range ? ? spread bypass option available ? ? spread selection via external pins ? ? packaging: (pb-free and green) 16 -pin tqfn pcie 3.0 clock generator with 1 hcsl outputs PI6C557-01BQ reva 06/01/2015 all trademarks are property of their respective owners. 15-0069
2 pin description pin # pin name i/o ty pe description 1 gnd power connect to ground 2 x1 input crystal or reference clock in 3 x2 output xtal out. leave unconnected for clock input. 4 nc - no connect. must not be connected to gnd 5 gnd power connect to ground 6 ss1 input spread select 1. internall pull up resistor 7 iref output 475 precision resistor attached to this pin is connected to the internal current reference. 8 nc - no connect. must not be connected to gnd 9 vdda power connect to 3.3v source 10 gnd power connect to ground 11 clk output hcsl complimentary clock output 12 clk output hcsl clock output 13 nc - no connect. must not be connected to gnd 14 nc - no connect. must not be connected to gnd 15 vdd power connect to 3.3v source for osc and core 16 nc - no connect. must not be connected to gnd table 1: spread selection table ss1 spread 0 down -0.5% 1 no spread PI6C557-01BQ reva 06/01/2015 all trademarks are property of their respective owners. PI6C557-01BQ pcie 3.0 clock generator with 1 hcsl output 15-0069
3 application information decoupling capacitors decoupling capacitors of 0.01f should be connected between each v dd pin and the ground plane and placed as close to the v dd pin as possible. crystal use a 25mhz fundamental mode parallel resonant crystal with less than 300ppm of error across temperature. crystal capacitors c l = crystals's load capacitance in pf crystal capacitors (pf) = (c l - 8) *2 for example, for a crystal with 16pf load caps, the external ef - fective crystal cap would be 16 pf. (16-8)*2=16. current source (iref) reference resistor - r r if board target trace impedance is 50?, then r r = 475? providing an iref of 2.32 ma. te output cur - rent (i oh ) is 6*iref. output termination te pci express diferential clock outputs of the PI6C557-01BQ are open source drivers and require an external series resistor and a resistor to ground. tese resistor values and their allow - able locations are shown in detail in the pci express layout guidelines section. te PI6C557-01BQ can be confgured for lvds compatible volt - age levels. see the lvds compatible layout guidelines section. output structures r r = 475 6*iref =2.3ma iref s ee out pu t termi na tion se cti ons ? PI6C557-01BQ reva 06/01/2015 all trademarks are property of their respective owners. PI6C557-01BQ pcie 3.0 clock generator with 1 hcsl output 15-0069
4 typical pci express (hcsl) waveform 0. 175 v 0.5 2 v 0. 175 v 0.5 2 v t or t of 250 ps 40 0 ps 800 mv 0 pci express device routing r s r s r t r t pci-express load or connector l1 l2 l3? l4 l1? l2? l3 l4? pi6c 557 -01bq out put cl ock pci express layout guidelines common recommendations for diferential routing dimension or value unit l1 length, route as non-coupled 50? trace. 0.5 max inch l2 length, route as non-coupled 50? trace. 0.2 max inch l3 length, route as non-coupled 50? trace. 0.2 max inch r s 33 ? r t 49.9 ? diferential routing on a single pcb dimension or value unit l4 length, route as coupled microstrip 100? diferential trace. 2 min to 16 max inch l4 length, route as coupled stripline 100? diferential trace. 1.8 min to 14.4 max inch diferential routing to a pci express connector dimension or value unit l4 length, route as coupled microstrip 100? diferential trace. 0.25 min to 14 max inch l4 length, route as coupled stripline 100? diferential trace. 0.225 min to 12.6 max inch PI6C557-01BQ reva 06/01/2015 all trademarks are property of their respective owners. PI6C557-01BQ pcie 3.0 clock generator with 1 hcsl output 15-0069
5 application information lvds recommendations for diferential routing dimension or value unit l1 length, route as non-coupled 50? trace. 0.5 max inch l2 length, route as non-coupled 50? trace. 0.2 max inch rp 100 ? rq 100 ? rt 150 ? l3 length, route as 100? diferential trace. l3 length, route as 100? diferential trace. lvds device routing l1 l2? l3 l1? l2 l3? r q r p lv ds device load pi6c55 7- 01bq cl ock out put r t r t PI6C557-01BQ reva 06/01/2015 all trademarks are property of their respective owners. PI6C557-01BQ pcie 3.0 clock generator with 1 hcsl output 15-0069
6 supply voltage to ground potential ....................... 5.5v all inputs and outputs ...................... -0.5v to v dd +0.5v ambient operating temperature .................. -40 to +85c storage temperature ............................ -65 to +150c junction temperature ................................. 150c soldering temperature ................................. 260c esd protection (input) ..................... 2000 v min (hbm) electrical specifcations recommended operation conditions parameter min. ty p. max. unit ambient operating temperature -40 +85 c power supply voltage (measured in respect to gnd) +3.0 +3.6 v dc characteristics (v dd = 3.3v 10%, t a = -40c to +85c) symbol parameter conditions min. ty p. max. unit v dd supply voltage 3.0 3.3 3.6 v v ih input high voltage (1) 2.0 v dd +0.3 v v il input low voltage (1) gnd -0.3 0.8 v i il input leakage current 0 < vin < v dd with input pull-up and pull-downs -20 20 a without input pull-up and pull-downs -5 5 i dd operating supply cur - rent r l = 50 , c l = 2pf 95 ma c in input capacitance @ 55mhz 7 pf c out output capacitance @ 55mhz 6 pf l pin pin inductance 5 nh r out output resistance clk outputs 3.0 k notes: 1. single edge is monotonic when transitioning through region. maximum ratings (above which useful life may be impaired. for user guidelines, not tested.) note: stresses greater than those listed under maxi - mum ratings may cause permanent damage to the device. tis is a stress rating only and func - tional operation of the device at these or any other conditions above those indicated in the operational sections of this specifcation is not implied. expo - sure to absolute maximum rating conditions for extended periods may afect reliability. PI6C557-01BQ reva 06/01/2015 all trademarks are property of their respective owners. PI6C557-01BQ pcie 3.0 clock generator with 1 hcsl output 15-0069
7 termal characteristics symbol parameter conditions min. ty p. max. unit ja termal resistance junction to ambient still air 57.70 c/w jc termal resistance junction to case 32.20 c/w hcsl output ac characteristics (v dd = 3.3v 10%, t a = -40c to +85c) symbol parameter conditions min. ty p. max. unit f in input frequency 25 mhz f out output frequency 100 mhz v oh output high voltage (1,2) 100 mhz hcsl output @ v dd = 3.3v 660 800 900 mv v ol output low voltage (1,2) -150 0 mv v cpa crossing point voltage (1,2) absolute 250 350 550 mv v cn crossing point voltage (1,2,4) variation over all edges 140 mv j cc jitter, cycle-to-cycle (1,3) 35 60 ps j rms pcie 2.0 rms jitter pcie 2.0 test method @ 100mhz output 3.1 ps j rms3.0 pcie 3.0 rms jitter pll l-bw @ 2m & 5m 1st h3 1.75 3 ps pll l-bw @ 2m & 4m 1st h3 2.18 3 ps pll h-bw @ 2m & 5m 1st h3 0.45 1 ps pll h-bw @ 2m & 4m 1st h3 0.45 1 ps mf modulation frequency spread spectrum 30 31.5 33 khz t or rise time (1,2) from 0.175v to 0.525v 175 500 ps t of fall time (1,2) from 0.525v to 0.175v 175 500 ps t du t y- cycle duty cycle (1,3) 45 55 % t stable from power-up to v dd =3.3v from power-up v dd =3.3v 3.0 ms t spread setting period afer spread change setting period afer spread change 3.0 ms notes: 1. r l = 50-ohm with c l = 2 pf 2. single-ended waveform 3. differential waveform 4. measured at the crossing point PI6C557-01BQ reva 06/01/2015 all trademarks are property of their respective owners. PI6C557-01BQ pcie 3.0 clock generator with 1 hcsl output 15-0069
8 c1 27pf 25m crystal? (c l? =?20pf) c2 27pf xin xout optional 360 recommended crystal circuit te following diagram shows pi6c557-05q crystal circuit connection with a parallel crystal. for the c l=20pf parallel crystal, it is suggested to use c1=27 pf, c2=27 pf in general. c1 and c2 can be adjusted to fne tune to the target ppm of crystal oscillation according to diferent board layouts. r1=360 ohm is recommended in layout for smaller size crystal drive level adjustment. recomended crystal specifcation pericom recommends: a) fl2500184q, smd 3.2x2.5(4p), 25m, cl=20pf, frequency tolerance 15ppm, stability 20ppm (http://www.pericom.com/pdf/datasheets/se/fl.pdf ) PI6C557-01BQ reva 06/01/2015 all trademarks are property of their respective owners. PI6C557-01BQ pcie 3.0 clock generator with 1 hcsl output 15-0069
9 packaging mechanical: 16-pin tqfn (zh) description: 16-contact, thin fine pitch quad flat no-lead (tqfn) package code: zh (zh16) document control #: pd-2047 :noisiver e date:12/26 /13 14-0244 ordering information ordering code package code pack age ty pe operating temperature pic55-01bhie h pb-free green, 1-pin tfn industrial notes: ? termal characteristics can be found on the company web site at www.pericom.com/packaging/ ? "e" denotes pb-free and green ? adding an "x" at the end of the ordering code denotes tape and reel packaging note: for latest package info, please check: http://www.pericom.com/products/packaging/mechanicals.php PI6C557-01BQ reva 06/01/2015 all trademarks are property of their respective owners. PI6C557-01BQ pcie 3.0 clock generator with 1 hcsl output 15-0069
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