PL602041 clockworks? pci e quad outputs ultra - low jitter, hcsl frequency synthesizer clockworks and ripple blocker are trademarks of micrel, inc. micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 (408) 944 - 0800 ? fax + 1 (408) 474 - 1000 ? http://www.micrel.com december 11 , 2013 revision 1.2 hbwhelp@micrel.com or (408) 955 - 1690 general description the PL602041 is a member of the clockworks ? family of devices from micrel and provides an extremely low - noise timing solution for pci express clock signals. the device operates from a 3.3v or 2.5v power supply and synthesizes four hcsl output clocks at 25mhz, 100mhz , 125mhz , and 200mhz . the PL602041 accepts a 25 mhz c rystal . datasheets and support documentation are available on micrels web site at: www.micrel.com . features ? input c rystal f requency of 25mhz ? generates four hcsl clock outputs at 25mhz, 100mhz , 125mhz , and 200mhz ? 2.5v or 3.3v operating range ? typical phase jitter @ 100mhz (1.875mhz to 20mhz): 105 f s ? compliant with pci express gen1, gen2, and gen3 ? industrial temperature range ( C 40 ? c to +85 ? c ) ? rohs and pfos compliant ? available in 2 4 - pin 4mm x 4mm qfn package applications ? servers ? storage systems ? switches and routers ? gigabit ethernet ? set - top boxes/dvrs ____________________________________________________________________________________________ _____________________________ block diagram
micrel, inc. PL602041 december 11 , 2013 2 revision 1.2 hbwhelp@micrel.com or (408) 955 - 1690 ordering inf ormation ( 1 ) part number marking shipping junction temp erature range package PL602041umg pl 602 041 tube C 40 c to +85 c 24 - pin qfn PL602041umg tr pl 602 041 tape and reel C 40 c to +85c 24 - pin qfn note: 1. devices are rohs and pfos compliant . pin configuration 24 - pin qfn (top view ) pin description pin number pin name pin type pin level pin function 17, 18 19, 20 /q0, q0 /q1, q1 o, (dif) hcsl differential clock outputs pairs . 2 3, 24 1, 2 /q2, q2 /q3, q3 o, (dif) hcsl differential clock outputs pairs . 9 vddo2 pwr power supply . 16, 21 vddo1 pwr power supply . 3, 7 vdd pwr core power supply . 4, 5, 13, 22 vss pwr power supply ground . 6, 8 s0, s1 i lvcmos frequency select for 25mhz, 100mhz, 125mhz, and 200mhz. each pin has a 45k ? pull - up. 10 xin i, (se) crystal crystal input, n o load caps needed (see figure 5 ). 11 xout o, (se) crystal crystal output, n o load caps needed (see figure 5 ). 12 oe i, (se) lvcmos output enable/disable . 14, 15 nc no connect .
micrel, inc. PL602041 december 11 , 2013 3 revision 1.2 hbwhelp@micrel.com or (408) 955 - 1690 absolute maximum ratings ( 2 ) supply voltage (v dd , v ddo1/2 ) ................................ ...... +4.6 v input voltage (v in ) .............................. ? 0.50v to v dd + 0.5 v lead temperature (s oldering, 2 0s) ............................ 260c case temperature ................................ ..................... 115c storage temperature ( t s ) ......................... ? 65 ? c to ? 150 c operating ratings ( 3 ) supply voltage (v dd , v ddo1/2 ) ............... +2.375v to +3.465 v ambient temperature (t a ) .......................... C 40c to +85c junction thermal resistance ( 4 ) qfn ( ? ja ) still air ................................ ............... 50 c/w qfn ( ? jb ) junction - to - board ............................. 30 c/w dc electrical characteristics ( 5 ) v dd = v ddo1/ 2 = 3.3v ? 5% or 2.5v ? 5% v dd = 3.3v ? 5%, v ddo1/2 = 3.3v ? 5% or 2.5v ? 5% t a = ? 40 ? c to ? 85 ? c. symbol parameter condition min . typ . max . units v dd , v ddo1/2 2.5v operating voltage 2.375 2.5 2.625 v v dd , v ddo1/2 2.5v operating voltage 3.135 3.3 3.465 v i dd supply current to v dd + v ddo outputs 50 ss 150 185 ma hcs l dc electrical characteristics ( 5 ) v dd = v ddo1/2 = 3.3v ? 5% or 2.5v ? 5% v dd = 3.3v ? 5%, v ddo1/2 = 3.3v ? 5% or 2.5v ? 5% t a = ? 40 ? c to ? 85 ? c. r l = 50 to v ss symbol parameter condition min . typ . max . units v oh output high voltage 660 700 850 mv v ol output low voltage ? cross crossing point voltage 250 350 550 mv l vcmos (s0, s1) dc electrical characteristics ( 6 ) v dd = 3.3v ? 5%, or 2.5v ? 5%, t a = ? 40 ? c to ? 85 ? c. symbol parameter condition min . typ . max . units v i h in put high voltage 2 v dd + 0.3 v v i l in put low voltage ? ih input high current v dd = v in = 3.465v 150 ? il input low current v dd = 3.465v, v in = 0 v ? ? notes: 2. permanent device damage may occur if absolute maximum ratings are exceeded. this is a stress rating only and functional opera tion is not implied at conditions other than those detailed in the operational sections of this data sheet. exposure to absolute maximum rating cond itions for extended periods may affect device reliability. 3. the datasheet limits are not guaranteed if the device is operated beyond operating ratings. 4. package thermal resistance assumes exposed pad is soldered (or equivalent) to the devices most negative potential on the pcb . 5. the circuit is designed to meet the ac and dc specifications shown in the above table(s) after thermal equili brium has been established. 6. all phase noise measurements were taken with an agilent 5052b phase noise system.
micrel, inc. PL602041 december 11 , 2013 4 revision 1.2 hbwhelp@micrel.com or (408) 955 - 1690 crystal characteristics parameter condition min . typ . max . units mode of oscillation 10pf l oad capacitance fundamental, parallel resonant frequency 25 mhz equivalent series resistance (esr) 50 ? shunt capacitor, c0 1 5 pf correlation drive level 10 100 ? w ac electrical characteristics ( 6 , 7 ) v dd = v ddo1/2 = 3.3v ? 5% or 2.5v ? 5% v dd = 3.3v ? 5%, v ddo1/2 = 3.3v ? 5% or 2.5v ? 5% t a = ? 40 ? c to ? 85 ? c. r l = 50 to v ss symbol parameter condition min . typ . max . units f out output frequency 25, 100, 125, 200 mhz f ref crystal input frequency 25 mhz t r /t f hcs l output rise/fall time 20% C skew output - to - output skew note 7 45 ps t lock pll lock time 20 ms t jit ( ? ( 8 ) 100 mhz integration range (1.875mhz C C notes: 7. defined as skew between outputs at the same supply voltage and with equal load conditions; measured at the output differential crossing points. 8. measured using 25mhz crystal as the input reference source. if using an external reference input, use a low phase noise sourc e. with an external reference, the phase noise will follow the input source ph ase noise up to about 1mhz. truth tables s 1 s 0 output 0 0 25mhz 0 1 100mhz 1 0 125mhz 1 1 200mhz
micrel, inc. PL602041 december 11 , 2013 5 revision 1.2 hbwhelp@micrel.com or (408) 955 - 1690 phase noise plots pha se noise plot: 100mhz, 1.875mhz ? phase noise plot: 100mhz, 12khz ?
micrel, inc. PL602041 december 11 , 2013 6 revision 1.2 hbwhelp@micrel.com or (408) 955 - 1690 figure 1 . duty cycle timing figure 2 . all outputs rise/fall time figure 3 . rms phase/noise jitter
micrel, inc. PL602041 december 11 , 2013 7 revision 1.2 hbwhelp@micrel.com or (408) 955 - 1690 figure 4 . hcsl output load and test circuit figure 5 . h csl recommended application termination (source terminated) figure 6 . crystal input interface
micrel, inc. PL602041 december 11 , 2013 8 revision 1.2 hbwhelp@micrel.com or (408) 955 - 1690 application information crystal layout keep the layers under the crystal as open as possible and do not place switching signals or noisy supplies under the crystal. crystal load capacitance is built inside the die, so no external capacitance is needed. see the selecting a quartz crystal for the clockworks flex i family of precision synthesizers application note for more details. contact micrels hbw applications group at : hbwhelp@micrel.com if you need help selecting a suitable crystal for your applicati on. power supply and decoupling place the smallest value decoupling capacitor (4.7nf above) between the vdd and vss pins, as close as possible to those pins and at the same side of the pcb as the ic. the shorter the physical path from vdd to capacitor and back from capacitor to vss, the more effective the decoupling. use one 4.7nf capacitor for each vdd pin on the PL602041. the impedance value of the ferrite bead (fb) needs to be between 240 and 600 with a saturation current 150ma. vddo1 and vddo2 pi ns connect directly to the vdd p lane. all vdd pins on the PL602041 connect to vdd after the power supply filter. hcsl outputs hcsl outputs are to be terminated with 50 to v ss . for best perfo rmance load all outputs. if you want to ac - couple or change the ter mination, contact micrels application group: hbwhelp@micrel.com ( see figure 5 ) . power supply filtering recommendations preferred filter, using micrel mic94300 or mic94310 ripple blocker ? : alternative, traditional filter, using a ferrite bead:
micrel, inc. PL602041 december 11 , 2013 9 revision 1.2 hbwhelp@micrel.com or (408) 955 - 1690 package information ( 9 ) 24 - pin package type ( qfn ) note: 9. package information is correct as of the publication date. for updates and most current information, go to www.micrel.com . micrel, inc. 2180 fortune drive san jose, ca 95131 usa tel +1 (408) 944 - 0800 fax +1 (408) 474 - 1000 web http://www.micrel.com micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in th is data sheet. this information is not intended as a warranty and micrel does not assume responsibility for its use. micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. no license, whether express, implied, arising by estoppel or otherwise, to any intellectual property r ights is granted by this document. except as provided in micrels terms and conditions of sale for such products, micrel assumes no liability purchasers use or sale of micrel products for use in life support appliances, devices or systems is a purchasers own risk a ? 20 13 micrel, incorporated.
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