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sm802128 clockworks ? 10gbe octal 156.25mhz, 312.5mhz, 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 january 2012 hbwhelp@micrel.com or (408) 955-1690 general description the sm802128 is a member of the clockworks ? family of devices from micrel and provides an extremely low-noise timing solution for 10gbe ethernet 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 lvpecl output clocks at 156.25mhz or 312.5mhz. the sm802128 accepts a 25 mhz crystal or lvcmos reference clock. data sheet and support documentation can be found on micrel?s web site at: www.micrel.com . features ? generates eight lvpecl clocks at 156.25mhz or 312.5mhz ? 2.5v or 3.3v operating range ? typical phase jitter @ 156.25mhz (1.875mhz to 20mhz): 110fs with crystal reference ? industrial temperature range (?40 c to +85 c) ? green, rohs, and pfos compliant ? available in 44-pin 7mm 7mm qfn package ________________________________________________________________________________________________________ block diagram
micrel, inc. sm802128 january 2012 2 hbwhelp@micrel.com or (408) 955-1690 ordering information (1) part number marking shipping temperature range package SM802128UMG 802128 tray ?40c to +85c 44-pin qfn SM802128UMGtr 802128 tape and reel ?40c to +85c 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 level pin function 25, 26 28, 29 32, 33 35, 36 /q1, q1 /q2, q2 /q3, q3 /q4, q4 o, (dif) lvpecl differential clock outputs from bank 1 (156.25mhz or 312.5mhz). 41, 42 1, 2 4, 5 7, 8 /q5, q5 /q6, q6 /q7, q7 /q8, q8 o, (dif) lvpecl differential clock outputs from bank 2 (156.25mhz or 312.5mhz). 31, 37, 38 vddo1 pwr power su pply for the outputs on bank 1. 43, 44, 16 vddo2 pwr power su pply for the outputs on bank 2. 24, 39 vsso1 pwr power supply gr ound for the outputs on bank 1.
micrel, inc. sm802128 january 2012 3 hbwhelp@micrel.com or (408) 955-1690 pin description (continued) pin number pin name pin type pin level pin function 3, 6, 40 vsso2 pwr power supply ground for the outputs on bank 2 11, 20, 27, 30, 34 test factory test pins. do not connect anything to these pins. 12, 13 vdd pwr core power supply 21, 23 vss (exposed pad) pwr core power supply ground. the exposed pad must be connected to the vss ground plane. 17 ref_in i, (se) lvcmos reference clock input 18 xtal_in i, (se) crystal crystal reference input, no load caps needed (see figure 5). 19 xtal_out o, (se) crystal crystal reference output, no load caps needed (see figure 5). 15 oe1 i, (se) lvcmos output enable, q1-q4 disables to tri-state, 0 = disabled, 1 = enabled, 45k ? pull-up. 22 oe2 i, (se) lvcmos output enable, q5-q8 disables to tri-state, 0 = disabled, 1 = enabled, 45k ? pull-up. 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 14 fsel i, (se) lvcmos frequency select, 1 = 156.25mhz, 0 = 312.5mhz, 45k ? pull-up truth tables oe1/2 0 tri-state 1 lvpecl fsel output frequency (mhz) 0 312.5 1 156.25 pll_bypass/csb xtal_sel 0 ? ? ? ? ? 0 ref_in ? ? 1 xtal ?
micrel, inc. sm802128 january 2012 4 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, 20sec.)????260c case temperature????????????.115c storage temperature (t s )????...-65c 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 = -40 c to + 85 c. symbol parameter condition min. typ. max. units v dd , v ddo1/2 2.5v operating voltage v ddo1 =v ddo2 2.375 2.5 2.625 v v dd , v ddo1/2 3.3v operating voltage v ddo1 =v ddo2 3.135 3.3 3.465 v i dd supply current v dd + v ddo outputs open 156.25mhz 220 275 ma 312.5mhz 275 345 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 lvcmos (pll_bypass, xtal _sel, oe1, oe2, 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
micrel, inc. sm802128 january 2012 5 hbwhelp@micrel.com or (408) 955-1690 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 a crystal characteristics paramete r condition min. typ. max. units mode of oscillation 10pf 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. sm802128 january 2012 6 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 = 1 156.25 mhz f out2 output frequency 2 fsel = 0 312.5 mhz f ref reference input frequency 25 mhz t r /t f odc lvpecl output rise/fall time output duty cycle 20% ? 80% 80 175 350 ps 48 50 52 % t skew output-to-output skew q1 ? q8 (6 ) 45 ps t lock pll lock time 20 ms t jit ( ? ) rms phase jitter (7) 156.25mhz integration range (1.875mhz ? 20mhz) integration range (12khz ? 20mhz) 312.5mhz integration range (1.875mhz ? 20mhz) integration range (12khz ? 20mhz) 110 250 110 250 fs spurious noise components 6.25mhz using 156.25mhz 12.5mhz using 312.5mhz -80 -85 dbc 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 afte r thermal equilibrium has been est ablished. 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 and same frequency; measured at th e output differential crossing points. 7. measured using a 25mhz crystal as the input reference source. if using an extern al reference input, use a low phase noise s ource. with an external reference, the phase noise w ill follow the input source phase noise up to about 1mhz offset frequency.
micrel, inc. sm802128 january 2012 7 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 clockworks flex i family of precision synthesizers application note for further details. contact micrel?s hbw applications group if you need assistance on selecting a suitable crystal for your application at: hbwhelp@micrel.com .
micrel, inc. sm802128 january 2012 8 hbwhelp@micrel.com or (408) 955-1690 phase noise plots phase noise plot: 156.25mhz, 1.875mhz ? 20mhz 108fs phase noise plot: 156.25mhz, 12khz ? 20mhz 244fs
micrel, inc. sm802128 january 2012 9 hbwhelp@micrel.com or (408) 955-1690 phase noise plots (continued) phase noise plot: 312.5mhz, 1.875mhz ? 20mhz 113fs phase noise plot: 312.5mhz, 12khz ? 20mhz 248fs
micrel, inc. sm802128 january 2012 10 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. sm802128 january 2012 11 hbwhelp@micrel.com or (408) 955-1690 figure 4. lvpecl output load figur e 5. crystal input interface
micrel, inc. sm802128 january 2012 12 hbwhelp@micrel.com or (408) 955-1690 package information 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. ? 2012 micrel, incorporated.

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