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SM802104 clockworks ? fibre channel (106.25mhz, 212.5mhz), ultra-low jitter, lvpecl 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 april 2011 m9999-042111-a hbwhelp@micrel.com or (408) 955-1690 general description the SM802104 is a member of the clockworks ? family of devices from micrel and provides an extremely low-noise timing solution for fibre channel 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 lvpec l output clocks at 106.25mhz or 212.5mhz. there are normally two clock outputs, but one output can be achieved by powering down the second output with the oe pin. the SM802104 accepts a 26.5625mhz crystal or lvcmos reference clock. data sheets and support documentation can be found on micrel?s web site at: www.micrel.com . features ? generates one or two lvpecl clock outputs at 106.25mhz or 212.5mhz ? 2.5v or 3.3v operating range ? typical phase jitter @ 106.25mhz (637khz to 10mhz): 200fs ? industrial temperature range ? green, rohs, and pfos compliant ? available in 24-pin 4mm 4mm qfn package applications ? fibre channel ? storage networking (san, nas) block diagram
micrel, inc. SM802104 april 2011 2 m9999-042111-a hbwhelp@micrel.com or (408) 955-1690 ordering information part number marking shipping junction temperature range (1) package SM802104umg 802104 tube -40 c to +85 c 24-pin qfn SM802104umgr 802104 tape and reel -40 c to +85 c 24-pin qfn note: 1. devices are green, rohs, and pfos compliant. pin configuration 24-pin qfn (code) (top view) pin description pin number pin name pin type pin level pin function 19, 20 /q1, q1 o, (dif) lvpecl differential clock output from bank 1 106.25mhz or 212.5mhz 22, 23 /q2, q2 o, (dif) lvpecl differential clock output from bank 2 106.25mhz or 212.5mhz 24 vddo2 pwr power supply for output bank 2 2 vsso2 pwr power supply ground for output bank 2 3 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 4 xtal_sel i, (se) lvcmos selects pll input reference source 0 = ref_in, 1 = xtal, 45k ? pull-up
micrel, inc. SM802104 april 2011 3 m9999-042111-a hbwhelp@micrel.com or (408) 955-1690 pin description (continued) pin number pin name pin type pin level pin function 5, 11, 16, 18 test factory test pins , do not connect anything to these pins. 1 vdd pwr core power supply 13, 14, 15 vss pwr core power supply ground 17 vddo1 pwr power supply for output bank 1 21 vsso1 pwr power supply ground for output bank 1 8 ref_in i, (se) lvcmos reference clock input 9 xtal_in i, (se) 12pf crystal crystal reference input, no load caps needed. see fig. 5. 10 xtal_out o, (se) 12pf crystal crystal reference output, no load caps needed. see fig. 5. 6 fsel i, (se) lvcmos frequency select, 1 = 106.25mhz, 0 = 212.5mhz, 45k ? pull-up 7 oe1 i, (se) lvcmos output enable, q1 disables to tri-state, 0 = disabled, 1 = enabled, 45k ? pull-up 12 oe2 i, (se) lvcmos output enable, q2 disables to tri-state, 0 = disabled, 1 = enabled, 45k ? pull-up 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. do not place switching signals or noisy supplies under the crystal. truth tables pll_bypass xtal_sel input output 0 ? ? pll 1 ? ? xtal/ref_in ? 0 ref_in ? ? 1 xtal ? fsel output frequency (mhz) 0 212.5 1 106.25
micrel, inc. SM802104 april 2011 4 m9999-042111-a hbwhelp@micrel.com or (408) 955-1690 absolute maximum ratings (1) supply voltage (v dd , v ddox ) ........................................+4.6v input voltage (v in ) ............................... -0.50v to v dd + 0.5v lead temperature (sol dering, 20s )............................ 260c case temper ature ..................................................... 115c storage temperature (t s ) ..........................-65 c to + 150c operating ratings (2) supply voltage (v dd , v ddox )................. +2.375v to +3.465v ambient temperature (t a )........................... -40c to +85c junction thermal resistance (3) qfn ( ja ) still-air ......................................................... 50c/w qfn ( jb ) junction-to-board ....................................... 30c/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 = -40 c to + 85 c. symbol parameter condition min. typ. max. units v dd , v ddox 2.5v operating voltage 2.375 2.5 2.625 v v dd , v ddox 3.3v operating voltage 3.135 3.3 3.465 v 106.25mhz - 1 output 82 105 106.25mhz - 2 outputs 98 127 212.5mhz - 1 output 92 119 i dd ref_in supply current v dd + v ddo xtal_sel = 0 outputs open 212.5mhz - 2 outputs 111 145 ma 106.25mhz - 1 output 93 120 106.25mhz - 2 outputs 109 142 212.5mhz - 1 output 103 134 i dd xtal supply current v dd + v ddo xtal_sel = 1 outputs open 212.5mhz - 2 outputs 122 159 ma lvpecl 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 ddo - 2v symbol parameter condition min. typ. max. units v oh output high voltage v ddo ? 1.145 v ddo ? 0.97 v ddo ? 0.845 v v ol output low voltage v ddo ? 1.945 v ddo ? 1.77 v ddo ? 1.645 v v swing output voltage swing 0.6 0.8 1.0 v 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 device?s most negative potential on the pc b. 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. SM802104 april 2011 5 m9999-042111-a hbwhelp@micrel.com or (408) 955-1690 lvcmos (pll_bypass, xtal _sel, oe1/2, fsel) 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 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 = -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 xtal_sel = v il , v in = 0v to v dd -5 5 a i in input current xtal_sel = v ih , v in = v dd 20 a crystal characteristics ndk nx2520sa parameter condition min. typ. max. units mode of oscillation 12pf load fundamental, parallel resonant frequency 26.5625 mhz equivalent series resistance (esr) 50 ? shunt capacitor, c0 3 7 pf correlation drive level 100 300 uw
micrel, inc. SM802104 april 2011 6 m9999-042111-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 = -40 c to + 85 c. r l = 50 ? to v ddo - 2v symbol parameter condition min. typ. max. units f out1 output frequency 1 fsel=1 106.25 mhz f out2 output frequency 2 fsel=0 212.5 mhz ppm output ppm variation crystal reference. note 6 -50 50 ppm f ref reference input frequency 26.5625 mhz t r /t f lvpecl output rise/fall time 20% ? 80% 80 175 350 ps odc output duty cycle 48 50 52 % t skew output-to-output skew within bank. note 7 45 ps t lock pll lock time 20 ms t jit ( ? ) rms phase jitter (8) 106.25mhz integration range (637khz ? 10mhz) integration range (12khz ? 20mhz) 212.5mhz integration range (637khz ? 10mhz) integration range (12khz ? 20mhz) 200 250 200 250 fs spurious noise components 26.5625mhz using 106.25mhz 26.5625mhz using 212.5mhz -80 -85 dbc notes: 5. all phase noise measurements were taken with an agilent 5052b phase noise system. 6. crystal tolerance at room less than 15ppm, over temp less than 20ppm. 7. defined as skew between outputs at the same supply voltage and with equal load conditions and same frequency; measured at th e output differential crossing points. 8. measured using 26.5625mhz crystal as the input reference source. if using an exter nal 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.
micrel, inc. SM802104 april 2011 7 m9999-042111-a hbwhelp@micrel.com or (408) 955-1690 phase noise plots phase noise plot: 106.25mhz, 637khz ? 10mhz 198fs phase noise plot: 106.25mhz, 12khz ? 20mhz 254fs
micrel, inc. SM802104 april 2011 8 m9999-042111-a hbwhelp@micrel.com or (408) 955-1690 phase noise plots (continued) phase noise plot: 212.5mhz, 637khz ? 10mhz 190fs phase noise plot: 212.5mhz, 12khz ? 20mhz 242fs
micrel, inc. SM802104 april 2011 9 m9999-042111-a 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. SM802104 april 2011 10 m9999-042111-a hbwhelp@micrel.com or (408) 955-1690 figure 4. lvpecl output load and test circuit figure 5. crystal input interface
micrel, inc. SM802104 april 2011 11 m9999-042111-a hbwhelp@micrel.com or (408) 955-1690 package information (4mm x 4mm) 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 can 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 implant 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. ? 2011 micrel, incorporated.

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