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pl60208x pcie octal, ultra-low jitter, hcsl frequency synthesizer 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 1.1 hbwhelp@micrel.com or (408) 955-1690 general description the pl602081 and pl602082 are members of the pci express family of devices from micrel and provide an extremely low-noise timing solution for pci express clock signals. they are based upon a unique synthesizer architecture that provides very low phase noise. the devices operate from a 3.3v or 2.5v power supply and synthesize eight hcsl output clocks. the pl602081 synthesizes 25mhz, 100mhz, or 200mhz and the pl602082 synthesizes 25mhz, 125mhz, or 250mhz. the pl60208x devices accept a 25 mh z crystal or lvcmos reference clock. datasheets and support documentation are available on micrels web site at : www.micrel.com . block diagram features ? generates eight hcsl clock outputs. ? pl602081 output frequencies: 25mhz, 100mhz, or 200mhz. ? pl602082 output frequencies: 25mhz, 125mhz, or 250mhz. ? 2.5v or 3.3v operating range. ? typical phase jitter: 250fs for 12khz to 20mhz. ? compliant with pci express gen1, gen2, and gen3. ? industrial temperature range ( C 40 ? c to +85 ? c). ? rohs and pfos compliant. ? available in 44-pin 7mm ? 7mm qfn package. applications ? servers ? storage systems ? switches and routers ? gigabit ethernet ? set-top boxes/dvrs downloaded from: http:///
micrel, inc. pl60208x december 11, 2013 2 revision 1. 1 hbwhelp@micrel.com or (408) 955-1690 ordering information ( 1 ) part number marking s hipping junction temperature range package PL602081UMG pl 602081umg tray C 40 to + 85 c 44 -pin qfn PL602081UMG tr pl 602081umg tape and reel C 40 to +85c 44 -pin qfn pl602082umg pl 602082umg tray C 40 to +85c 44 -pin qfn pl602082umg tr pl 602082umg tape and reel C 40 to +85c 44 -pin qfn note: 1. devices are rohs and pfos compliant. downloaded from: http:///
micrel, inc. pl60208x december 11, 2013 3 revision 1. 1 hbwhelp@micrel.com or (408) 955-1690 pin configuration 44 -pin qfn (top view) pin description pin number pin name pin type pin level pin name 1, 2 4, 5 7, 8 25, 26 28, 29 32, 33 35, 36 41, 42 /q5, q5 /q6, q6 /q7, q7 /q0, q0 /q1, q1 /q2, q2 /q3, q3 /q4, q4 o, (dif) hcsl differential clock output. 14 fsel i, (se) lvcmos frequency select, 1 = 100mhz, 0 = 200mhz, 45k? pull- up . 12, 13 vdd pwr power supply. 31, 37, 38 vddo1 pwr power supply for outputs q0 C q3 . 16, 43, 44 vddo2 pwr power supply for outputs q4 C q7 . 21, 23 vss (exposed pad) pwr core power supply ground. the exposed pad must be connected to the vss ground plane. 24, 39 vsso1 pwr power supply ground for outputs q0 C q3. 3, 6, 40 vsso2 pwr power supply ground for outputs q4 C q7. downloaded from: http:///
micrel, inc. pl60208x december 11, 2013 4 revision 1. 1 hbwhelp@micrel.com or (408) 955-1690 pin description (continued) pin number pin name pin type pin level pin name 9 pll_bypass i, (se) lvcmos pll bypass, selects output source. 0 = normal pll operation 1 = output from input reference clock or crystal 45k ? pull down 10 xtal_sel i, (se) lvcmos selects pll input reference source 0 = ref_in, 1 = xtal, 45k ? pull - up 11, 20, 27, 30, 34 test factory test pins. do not connect anything to these pins. 17 ref_in i, (se) lvcmos reference clock input 18 xtal_in i, (se) 10pf crystal crystal reference input, no load caps needed (see figure 6 ) 19 xtal_out o, (se) 10pf crystal crystal reference output, no load caps needed (see figure 6 ) 15 oe1 i, (se) lvcmos output enable, outputs q0 C q3 disable to tri-state, 0 = disabled, 1 = enabled, 45k ? pull- up 22 oe2 i, (se) lvcmos output enable, outputs q4 C q7 disable to tri-state, 0 = disabled, 1 = enabled, 45k ? pull- up downloaded from: http:///
micrel, inc. pl60208x december 11, 2013 5 revision 1. 1 hbwhelp@micrel.com or (408) 955-1690 absolute maximum ratings ( 2 ) supply voltage (v dd , v dd o1/2 ) ...................................... +4.6v input voltage (v in ) ............................... ? 0.50v to v dd +0.5v lead temperature (soldering, 20s) ............................ 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 +3.465v ambient temperature (t a ) .......................... C 40c to +85c junction thermal resistance ( 4 ) qfn ( ? ja ) still- air ............................................... 24 c/w qfn ( ? jb ) junction- to -board ............................... 8c/w dc electrical characteristics ( 4 ) vdd = vddo1/2 = 3.3v ? 5% or 2.5v ? 5% vdd = 3.3v ? 5%, vddo1/2 = 3.3v ? 5% or 2.5v ? 5% ta = ? 40 ? c to ? 85 ? c. symbol parameter condition min. typ. max. units v dd , v ddo1/2 2.5v operating range 2.375 2.5 2.625 v v dd , v ddo1/2 3.3v operating range 3.135 3.3 3.465 v i dd supply current v dd + v ddo eight outputs enabled, 100mhz outputs 50 to v ss 217 270 ma eight outputs enabled, 200mhz outputs 50 to v ss 229 285 four outputs enabled, 100mhz outputs 50 to v ss , oe1 or oe2 = 0 149 185 four outputs enabled, 200mhz outputs 50 to v ss , oe1 or oe2 = 0 158 197 hcsl dc electrical characteristics ( 4 ) 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 volt age - 150 0 27 mv v cross crossing point voltage 250 350 550 mv downloaded from: http:///
micrel, inc. pl60208x december 11, 2013 6 revision 1. 1 hbwhelp@micrel.com or (408) 955-1690 lvcmos (pll_bypass, xtal_sel, fsel, oe1, oe2) dc electrical characteristics ( 4 ) v dd = 3.3v ? 5% or 2.5v ? 5% , t a = ? 40 ? c to ? 85 ? c. symbol parameter condition min. typ. max. units v ih input high voltage 2 v dd + 0.3 v v il in put low voltage -0.3 0.8 v i ih input high current v dd = v in = 3.465v 1 50 ? a i il input low current v dd = 3.465v, v in = 0v - 150 ? a ref_in dc electrical characteristics ( 4 ) v dd = 3.3v ? 5% or 2.5v ? 5%, t a = ? 40 ? c to ? 85 ? c. symbol parameter condition min. typ. max. units v ih input high voltage 1.1 v dd + 0.3 v v il input low voltage -0.3 0.6 v i in input current xtal_sel = v il , v in = 0v to v dd -5 5 ? a xtal_sel = v ih , v in = v dd 20 crystal characteristics parameter condition min. typ. max. units mode of oscillation 10pf load fundamental, parallel resonant frequency 25 mhz equivalent series resistance (esr) 50 ? shunt capacitor, c0 2 5 pf correlation drive level 10 100 ? w downloaded from: http:///
micrel, inc. pl60208x december 11, 2013 7 revision 1. 1 hbwhelp@micrel.com or (408) 955-1690 ac electrical characteristics ( 4 , 6 ) 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 t r /t f hcsl output rise/fall time 20% - 80% 150 300 450 ps odc output duty cycle 48 50 52 % t skew output- to -output skew note 7 45 ps t lock pll lock time 20 ms t jit ( ? ) rms phase jitter ( 8 ) 100mhz or 125mhz integration range (12khz C 20mhz) integration range (10khz C 1.5mhz) integration range (1.5mhz C ny quist) 200mhz or 250mhz integration range (12kh z C 20mhz) integration range (10khz C 1.5mhz) integration range (1.5mhz C ny quist) 254 220 142 253 222 112 fs notes: 2. exceeding the absolute maximum ratings may damage the device. 3. the device is not guaranteed to function outside its opera ting ratings. 4. package thermal resistance assumes exposed pad is solde red (or equivalent) to the devices most negative potential on the pcb. 5. specification for packaged product only 6. all phase noise measurements were taken with an agilent 5052b phase noise system. 7. defined as skew between outputs at the same supply volta ge and with equal load conditions; measured at the output differential crossing points. 8. measured using 25mhz crystal as the input reference sou rce. if using an external reference input, use a low phas e noise source. with an external reference, the phase noise will follow the input source phase noise up to about 1mhz. downloaded from: http:///
micrel, inc. pl60208x december 11, 2013 8 revision 1. 1 hbwhelp@micrel.com or (408) 955-1690 truth tables pll_bypass xtal_sel oe2 oe1 input output 0 ? 1 1 ? pll 1 ? 1 1 ? xtal/ref_in ? 0 1 1 ref_in ? ? 1 1 1 xtal ? ? ? 0 1 ? q4 -q7 tri-state ? ? 1 0 ? q0 -q3 tri-state fsel pll_bypass output frequency (mhz) pl602081 pl602082 0 0 200 250 1 0 100 125 x 1 25 25 downloaded from: http:///
micrel, inc. pl60208x december 11, 2013 9 revision 1. 1 hbwhelp@micrel.com or (408) 955-1690 phase noise plots phase noise plot: 100mhz, 1.875mhz C 20mhz 101fs phase noise plot: 100mhz, 12khz C 20mhz 254fs downloaded from: http:///
micrel, inc. pl60208x december 11, 2013 10 revision 1. 1 hbwhelp@micrel.com or (408) 955-1690 phase noise plots (continued) phase noise plot: 200mhz, 1.875mhz C 20mhz 94fs phase noise plot: 200mhz, 12khz C 20mhz 253fs downloaded from: http:///
micrel, inc. pl60208x december 11, 2013 11 revision 1. 1 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 downloaded from: http:///
micrel, inc. pl60208x december 11, 2013 12 revision 1. 1 hbwhelp@micrel.com or (408) 955-1690 figure 4 . hcsl output load and test circuit figure 5. hcsl recommended application termination (source terminated) figure 6 . crystal input interface downloaded from: http:///
micrel, inc. pl60208x december 11, 2013 13 revision 1. 1 hbwhelp@micrel.com or (408) 955-1690 application information in put reference when operating with a crystal input reference, do not apply a switching signal to ref_in. 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 further details. contact micrels tcg applications group if you need assistance on selecting a suitable crystal for your application at: hbwhelp@micrel.com . po wer supply 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 pl60208 x. hcsl outputs hcsl outputs are to be terminated with 50 to vss . for best performance load all outputs. if you want to ac- couple or change the te rmination, contact micrels application group at: hbwhelp@micrel.com . downloaded from: http:///
micrel, inc. pl60208x december 11, 2013 14 revision 1. 1 hbwhelp@micrel.com or (408) 955-1690 package information ( 9 ) 44 -pin qfn note: 9. package information is correct as of the publication dat e. for updates and most current information, go to www.micrel.com . downloaded from: http:///
micrel, inc. pl60208x december 11, 2013 15 revision 1. 1 hbwhelp@micrel.com or (408) 955-1690 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 furn ished in this data sheet. this information is not intended as a warranty and micrel does n ot assume responsibility for its use. micrel reserves th e right to change circuitry, specifications and descriptions at any time without notice . no license, whether express, implied, arising by est oppel or otherwise, to any intellectual property rights is granted by this document. except as provided in micrels terms and conditions of sale for such products, micrel assumes no liability whatsoever, and micrel disclaims any express or implied warra nty relating to the sale and/or use of micrel products inclu ding liability or warranties relating to fitness for a particular purpose, merchantability , or infringement of any patent, copyright or other intelle ctual property right. micrel products are not designed or authorized for use a s components in life support appliances, devices or syst ems where malfunction of a product can reasonably be expected to result in personal injury. l ife support devices or systems are devices or systems t hat (a) are intended for surgical implant into the body or (b) support or sustain life, and whos e failure to perform can be reasonably expected to res ult in a significant injury to the user. a purchasers use or sale of micrel products for use in li fe support appliances, devices or systems is a purcha sers own risk a nd purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 20 13 micrel, incorporated. downloaded from: http:///

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