pl602041 clockworks? pci e quad outputs ultra-low jitter, hcsl frequency synthesizer clockworks and ripple blocker are trademarks of micrel, in c. micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 (408) 944 - 0800 ? fax + 1 (408) 474 - 1000 ? http://www.micrel.com january 28, 2014 revision 1.3 tcghelp@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 crystal. datasheets and support documentation are available on micrels web site at: www.micrel.com . features ? input crystal frequency 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): 105fs ? compliant with pci express gen1, gen2, and gen3 ? industrial temperature range ( C 40 ? c to +85 ? c) ? rohs and pfos compliant ? available in 24-pin 4mm x 4mm qfn package applications ? servers ? storage systems ? switches and routers ? gigabit ethernet ? set-top boxes/dvrs ____________________________________________________________________________________________ _____________________________ block diagram downloaded from: http:///
micrel, inc. pl602041 january 28 , 2014 2 revision 1.3 tcghelp@micrel.com or (408) 955-1690 ordering information ( 1 ) part number marking shipping junction temperature range package lead finish pl602041umg pl 602 041 tube C 40 c to +85c 24 -pin qfn nipdau pl602041umg tr pl 602 041 tape and reel C 40 c to +85c 24 -pin qfn nipdau 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. 23, 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, no load caps needed (see figure 5 ). 11 xout o, (se) crystal crystal output, no load caps needed (see figure 5 ). 12 oe i, (se) lvcmos output enable/disable. 14, 15 nc no connect. downloaded from: http:///
micrel, inc. pl602041 january 28 , 2014 3 revision 1.3 tcghelp@micrel.com or (408) 955-1690 absolute maximum ratings ( 2 ) supply voltage (v dd , v ddo1/2 ) ...................................... +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 ............................................... 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 conditi on 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 to v 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 ? 150 0 27 mv v cross crossing point voltage 250 350 550 mv lvcmos (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 ih in put 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 150 ? a i il input low current v dd = 3.465v, v in = 0v ? 150 ? a notes: 2. permanent device damage may occur if absolute maximu m ratings are exceeded. this is a stress rating only and fu nctional operation is not implied at conditions other than those detailed in the operational sections of this data sheet. exposure to absolute maxim um rating conditions 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 specification s shown in the above table(s) after thermal equilibrium has been established. 6. all phase noise measurements were taken with an agilent 5052b phase noise system. downloaded from: http:///
micrel, inc. pl602041 january 28 , 2014 4 revision 1.3 tcghelp@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 80% 150 300 4 50 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 ) 100 mhz integration range (1.875mhz C 20mhz) integration range (12khz C 20mhz) 105 250 fs notes: 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 phase noise source. with an external reference, the phase noise will follow the input source phase noise up to about 1mhz. truth tables s1 s0 output 0 0 25mhz 0 1 100mhz 1 0 125mhz 1 1 200mhz downloaded from: http:///
micrel, inc. pl602041 january 28 , 2014 5 revision 1.3 tcghelp@micrel.com or (408) 955-1690 phase noise plots phase noise plot: 100mhz, 1.875mhz ? 20mhz 104fs phase noise plot: 100mhz, 12khz ? 20mhz 242fs downloaded from: http:///
micrel, inc. pl602041 january 28 , 2014 6 revision 1.3 tcghelp@micrel.com or (408) 955-1690 figure 1. duty cycle timing figure 2. all outputs rise/fall time fig ure 3. rms phase/noise jitter downloaded from: http:///
micrel, inc. pl602041 january 28 , 2014 7 revision 1.3 tcghelp@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. pl602041 january 28 , 2014 8 revision 1.3 tcghelp@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 : tcghelp@micrel.com if you need help selecting a suitable crystal for your application. 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 pins connect directly to the vdd plane. 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 performance load all outputs. if you want to ac- couple or change the termination, contact micrels application group: tcghelp@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: downloaded from: http:///
micrel, inc. pl602041 january 28 , 2014 9 revision 1.3 tcghelp@micrel.com or (408) 955-1690 package information ( 9 ) 24 -pin package type (qfn) note: 9. package information is correct as of the publication dat e. 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 fur nished 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 includ ing liability or warranties relating to fitness for a particular purpose, merchantabilit y, 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 syste ms 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 whose failure to perform can be reasonably expected to result 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 and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2014 micrel, incorporated. downloaded from: http:///
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