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SM802101 clockworks ? pci-e octal 100mhz/200mhz ultra-low jitter, hcsl frequency synthesizer clockworks is a trademark of micrel, inc rotarywave is a registered trademark of multigig, 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 general description the SM802101 is a member of the clockworks ? family of devices from micrel and provides an extremely low-noise timing solution for pci-express clock signals. it is based upon a unique patented rotarywave ? architecture that provides very-low phase noise. the device operates from a 3.3v or 2.5v power supply and synthesizes eight hcsl out put clocks at 100mhz or 200mhz. the SM802101 accepts a 25mhz crystal or lvcmos reference clock. data sheets and support documentation can be found on micrel?s web site at: www.micrel.com . features ? generates eight hcsl clock outputs at 100mhz or 200mhz ? 2.5v or 3.3v operating range ? typical phase jitter @ 100mhz (1.875mhz to 20mhz): 105fs ? industrial temperature range (?40 c to +85 c) ? green, rohs, and pfos compliant ? available in 44-pin 7mm 7mm qfn package applications ? pci-express block diagram july 2011 m9999-072111-a hbwhelp@micrel.com or (408) 955-1690
micrel, inc. SM802101 july 2011 2 m9999-072111-a hbwhelp@micrel.com ordering information (1) part number marking shipping temperature range package SM802101umg 802101 tray ?40c to +85 c 44-pin qfn SM802101umgr 802101 tape and reel ?40c to +85 c 44-pin qfn note: 1. devices are green, rohs, and pfos compliant. pin configuration 44-pin qfn (top view) pin description pin number pin name pin type pin leve l pin function 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 or (408) 955-1690
micrel, inc. SM802101 july 2011 3 m9999-072111-a hbwhelp@micrel.com or (408) 955-1690 pin description (continued) pin number pin name pin type pin le vel pin function 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 ? q3 16, 43, 44 vddo2 pwr power supply for outputs q4 ? 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 q0 ? q3 3, 6, 40 vsso2 pwr power supply ground for outputs q4 ? q7 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) 12pf crystal crystal reference input, no load caps needed (see figure 5). 19 xtal_out o, (se) 12pf crystal crystal reference output, no load caps needed (see figure 5). 15 oe1 i, (se) lvcmos output enable, outputs q0 ? q3 disable to tri-state, 0 = disabled, 1 = enabled, 45k ? pull-up 22 oe2 i, (se) lvcmos output enable, outputs q4 ? q7 disable to tri-state, 0 = disabled, 1 = enabled, 45k ? pull-up 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 output frequency (mhz) 0 200 1 100
micrel, inc. SM802101 july 2011 4 m9999-072111-a hbwhelp@micrel.com or (408) 955-1690 absolute maximum ratings (1) 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 temper ature ..................................................... 115c storage temperature (t s ) ......................... ? 65 c to + 150c operating ratings (2) supply voltage (v dd , v ddo1/2 )............ +2.375v to +3.465v ambient temperature (t a ) .......................?40c to +85c junction thermal resistance (3) qfn ( ja ) still-air ......................................................24c/w qfn ( jb ) junction-to-board ......................................8c/w 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 = ? 40c to + 85c. 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 3.3v operating voltage 3.135 3.3 3.465 v eight outputs enabled, 100mhz outputs 50 to v ss 217 270 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 i dd supply current v dd + v ddo four outputs enabled, 200mhz outputs 50 to v ss , oe1 or oe2 =0 158 197 ma 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 = ? 40c to + 85c. 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 notes: 1. permanent device damage may occur if absolute maximum ratings are exceeded. this is a stress rating only and functional oper ation is not implied at conditions other than those detailed in the operational sections of this data shee t. exposure to absolute maximum rating con ditions for extended periods may affect device reliability. 2. the data sheet limits are not guaranteed if t he device is operated beyond the operating ratings. 3. package thermal resistance assumes exposed pad is soldered (o r equivalent) to the devices most negative potential on the pcb . 4. the circuit is designed to meet the ac and dc specifications shown in the above table(s) after thermal equilibrium has been established.
micrel, inc. SM802101 july 2011 5 m9999-072111-a hbwhelp@micrel.com or (408) 955-1690 lvcmos (pll_bypass, xtal_s el, fsel, oe1, oe2) dc electrical characteristics (4) v dd = 3.3v 5%, or 2.5v 5%, t a = ? 40c to + 85c. symbol parameter condition min. typ. max. units v ih input high voltage 2 v dd + 0.3 v v il input 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 ref_in dc electrical characteristics (4) v dd = 3.3v 5%, or 2.5v 5%, t a = ? 40c to + 85c. 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 xtal_sel = v il , v in = 0v to v dd ? 5 5 i in input current xtal_sel = v ih , v in = v dd 20 a crystal characteristics parameter condition min. typ. max. units mode of oscillation 12pf load fundamental, parallel resonant frequency 25 mhz equivalent series resistance (esr) 50 shunt capacitor, c0 1 5 pf correlation drive level 10 100 uw
micrel, inc. SM802101 july 2011 6 m9999-072111-a hbwhelp@micrel.com or (408) 955-1690 ac electrical characteristics (4, 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 = ? 40c to + 85c. r l = 50 to v ss symbol parameter condition min. typ. max. units f out1 output frequency fsel=1 100 mhz f out2 output frequency fsel=0 200 mhz f ref reference input frequency 25 mhz t r /t f lvpecl output rise/fall time 20% ? 80% 150 300 450 ps odc output duty cycle 48 50 52 % t skew output-to-output skew note 6 45 ps t lock pll lock time 20 ms t jit (? ) rms phase jitter (7) 100mhz integration range (1.875mhz ? 20mhz) integration range (12khz ? 20mhz) 200mhz integration range (1.875mhz ? 20mhz) integration range (12khz ? 20mhz) 105 250 100 250 fs spurious noise components 25mhz using 100mhz 25mhz using 200mhz -85 -90 dbc notes: 5. all phase noise measurements were taken with an agilent 5052b phase noise system. 6. defined as skew between outputs at the same supply voltage and with equal load conditions; m easured at the output differenti al crossing points. 7. measured using 25mhz crystal as the i nput reference source. if using an external reference input, use a low phase noise sour ce. with an external reference, the phase noise will follow t he input source phase noise up to about 1mhz.
micrel, inc. SM802101 july 2011 7 m9999-072111-a hbwhelp@micrel.com or (408) 955-1690 application information input 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 cloc kworks flex i family of precision synthesizers application note for further details. contact micrel?s hbw applic ations group if you need assistance on selecting a suitable crystal for your application at: hbwhelp@micrel.com . 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 micrel?s application group at: hbwhelp@micrel.com .
micrel, inc. SM802101 july 2011 8 m9999-072111-a hbwhelp@micrel.com phase noise plots phase noise plot: 100mhz, 1.875mhz ? 20mhz 101fs phase noise plot: 100mhz, 12khz ? 20mhz 254fs or (408) 955-1690
micrel, inc. SM802101 july 2011 9 m9999-072111-a hbwhelp@micrel.com phase noise plots (continued) phase noise plot: 200mhz, 1.875mhz ? 20mhz 94fs phase noise plot: 200mhz, 12khz ? 20mhz 253fs or (408) 955-1690
micrel, inc. SM802101 july 2011 10 m9999-072111-a hbwhelp@micrel.com figure 1. duty cycle timing figure 2. all outputs rise/fall time figure 3. rms phase/noise jitter or (408) 955-1690
micrel, inc. SM802101 july 2011 11 m9999-072111-a hbwhelp@micrel.com figure 4. hcsl output load and test circuit figure 5. crystal input interface or (408) 955-1690
micrel, inc. SM802101 july 2011 12 m9999-072111-a hbwhelp@micrel.com package information 44-pin qfn 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 t he accuracy or completeness of the information furnished in this data sheet. this information is not intended as a warranty and micrel does not assume responsibility for it s use. micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. no license, whether expre ss, implied, arising by estoppel or other wise, to any intellectual property rights is granted by this document. except as provided in micrel?s terms and conditions of sale for such products, mi crel assumes no liability whatsoever, and micrel disclaims any express or implied warranty relating to the sale and/or use of micrel products including l iability or warranties relating to fitness for a particular purpose, merchantability, or infringement of an y patent, copyright or other intellectual p roperty right. micrel products are not designed or authori zed for use as components in life support app liances, devices or systems where malfu nction of a product reasonably be expected to result in pers onal injury. life support devices or system s are devices or systems that (a) are in tended for surgical impla into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significan t injury to the user. a purchaser?s use or sale of micrel produc ts for use in life support app liances, devices or systems is a purchaser?s own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. can nt ? 2011 micrel, incorporated. or (408) 955-1690

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