sm802111 clockworks ? gbe dual 125mhz 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 m9999-041111-a hbwhelp@micrel.com or (408) 955-1690 general description the sm802111 is a member of the clockworks ? family of devices from micrel and provides an extremely low-noise timing solution for gigabit 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 two lvpecl out put clocks at 125mhz. the sm802111 accepts a 15mhz lvcmos reference clock. data sheets and support documentation can be found on micrel?s web site at: www.micrel.com . features ? generates two lvpecl clock outputs at 125mhz ? 2.5v or 3.3v operating range ? typical phase jitter @ 125mhz (1.875mhz to 20mhz): 85fs (typical) at 3.3v ? industrial temperature range ? green, rohs, and pfos compliant ? available in 24-pin 4mm 4mm qfn applications ? gigabit ethernet ___________________________________________________________________________________________________________ block diagram
micrel, inc. sm802111 april 2011 2 m9999-041111-a hbwhelp@micrel.com ordering information part number marking shipping junction temperature range package SM802111UMG 802111 tube ?40 to +85c 24-pin qfn SM802111UMGr 802111 tape & reel ?40 to +85c 24-pin qfn note: 1. devices are green, rohs, and pfos compliant. pin configuration 24-pin qfn (top view) pin description pin number pin name pin type pin level pin function 16, 17 20, 21 /q0, q0 /q1, q1 o, (dif) lvpecl differential clock output. 1, 18 vddo pwr power supply for clock output. 2, 22 vsso pwr power supply grounds for clock output. 3, 4, 23, 24 nc no connect,. do not connect anything to these pins. 5 pll_bypass i, (se) lvcmos pll bypass, selects output source 0 = normal pll operation 1 = output from input reference clock 45k ? pull-down 7, 10, 11, 12, 15, 19 test factory test pins. do not connect anything to these pins. 8 vdd pwr core power supply. 9 ref_in i, (se) lvcmos reference clock input. 6, 13, 14 vss pwr core power supply ground. or (408) 955-1690
micrel, inc. sm802111 april 2011 3 m9999-041111-a hbwhelp@micrel.com absolute maximum ratings (1) supply voltage (v dd , v ddo ) .........................................+4.6v input voltage (v in ) .............................. ? 0.50v to v dd + 0.5v lead temperature (soldering, 20s )............................ 260c case temperature ..................................................... 115 c storage temperature (t s ) ......................... ? 65 c to + 150c operating ratings (2) supply voltage (v dd , v ddo ) .................. +2.375v to +3.465v ambient temperature (t a ) .......................... ?40c to +85c junction thermal resistance (3) qfn ( ja ) still-air .........................................................50 c/w qfn ( jb ) junction-to-board........................................30c/w dc electrical characteristics (4) v dd = v ddo = 3.3v 5% or 2.5v 5% v dd = 3.3v 5%, v ddo = 3.3v 5% or 2.5v 5% t a = ?40c to +85c or (408) 955-1690 lvpecl dc electrical characteristics (4) v dd = v ddo 3.3v 5% or 2.5v 5% v dd = 3.3v 5%, v ddo = 3.3v 5% or 2.5v 5% t a = ?40c to +85c; r l = 50
to v ddo ? 2v lvcmos (pll_bypass) 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 ? 5 a 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 deta iled in the operational sections of this data sheet. exposure to absolute maximum ra ting conditions 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. symbol parameter condition min. typ. max. units v dd , v ddo 2.5v operating voltage 2.375 2.5 2.625 v v dd , v ddo 3.3v operating voltage 3.135 3.3 3.465 v i dd supply current, v dd + v ddo outputs open 91 115 ma 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
micrel, inc. sm802111 april 2011 4 m9999-041111-a hbwhelp@micrel.com or (408) 955-1690 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 i in input current v dd = 3.465v, v in = 0v to v dd ? 5 5 a ac electrical characteristics (4, 5) v dd = v ddo = 3.3v 5% or 2.5v 5% v dd = 3.3v 5%, v ddo = 3.3v 5% or 2.5v 5% t a = ? 40c to + 85c; r l = 50
to v ddo ? 2v symbol parameter condition min. typ. max. units f out output frequency 125 mhz f ref reference input frequency 15 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 note 6 45 ps t lock pll lock time 20 ms t jit (? ) rms phase jitter (7) output = 125mhz integration range (1.875mhz ? 20mhz) 85 fs spurious noise components 5mhz -73 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. ref_in driven with a low-noise source clockworks sm802001 pr ogrammed for a 15mhz cmos output. phase noise will track the in put phase noise up to about 1mhz offset frequency.
micrel, inc. sm802111 april 2011 5 m9999-041111-a hbwhelp@micrel.com sm802111 phase noise plot phase noise plot: 125mhz (1.875mhz ? 20mhz 75fs) or (408) 955-1690
micrel, inc. sm802111 april 2011 6 m9999-041111-a hbwhelp@micrel.com figure 1. duty cycle timing figure 2. all outputs rise/fall time figure 3. rms phase noise/jitter figure 4. lvpecl output load and test circuit or (408) 955-1690
micrel, inc. sm802111 april 2011 7 m9999-041111-a hbwhelp@micrel.com package information 24-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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