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  sm802124 clockworks ? dual 125mhz ultra-low jitter, cmos 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 september 2011 m9999-101311-b hbwhelp@micrel.com or (408) 955-1690 general description the sm802124 is a member of the clockworks ? family of devices from micrel and provides an extremely low-noise timing solution for 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 cmos output clocks at 125mhz from a 15mhz lvcmos reference clock. data sheets and support documentation can be found on micrel?s web site at: h u www.micrel.com u h . features ? generates two lvcmos clock outputs at 125mhz ? 2.5v or 3.3v operating range ? typical rms phase jitter @ 125mhz 1.875mhz to 20mhz : 85fs (input source dependent) ? industrial temperature range (?40 c to +85 c) ? green, rohs, and pfos compliant ? available in 24-pin 4mm 4mm qfn package applications ? gigabit ethernet block diagram
micrel, inc. sm802124 september 2011 m9999-101311-b hbwhelp@micrel.com or (408) 955-1690 ordering information (1) part number marking shipping temperature range package sm802124umg 802124 tube ?40 c to +85 c 24-pin qfn SM802124UMGTR 802124 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)
micrel, inc. sm802124 september 2011 m9999-101311-b hbwhelp@micrel.com or (408) 955-1690 pin description pin number pin name pin type pin level pin function 17 q0 o cmos 125mhz clock output 21 q1 o cmos 180 deg,125mhz clock output 3, 4, 16 , 20, 23, 24 nc - - no connection. do not connect anything to these pins. 1, 18 vddo pwr power supply for output 2, 22 vsso pwr power supply ground for output 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 6, 13 , 14 vss pwr core power supply ground 9 ref_in i, (se) lvcmos reference clock input
micrel, inc. sm802124 september 2011 4 m9999-101311-b hbwhelp@micrel.com or (408) 955-1690 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 (sol dering, 20s ) ........................... 260c case temper ature ..................................................... 115c 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 ........................................................ 50c/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 = 2.5v 5% t a = ? 40 c to + 85 c. 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 70 90 ma lvcmos output dc elect rical characteristics (4) v dd = v ddo = 3.3v 5% or 2.5v 5% v dd = 3.3v 5%, v ddo = 2.5v 5% t a = ? 40 c to + 85 c. r l = 50 ? to v ddo /2. symbol parameter condition min typ max units v oh output high voltage fig. 4 v dd -0.7 v v ol output low voltage fig. 4 0.6 v lvcmos (pll_bypass) 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 ? 5 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 i in input current v in = 0v to v dd ? 5 5 a
micrel, inc. sm802124 september 2011 5 m9999-101311-b hbwhelp@micrel.com or (408) 955-1690 ac electrical characteristics (4, 5) v dd = v ddo = 3.3v5% or 2.5v5% v dd = 3.3v5%, v ddo = 2.5v5% t a = ? 40c to ? 85c. r l = 50 ? to v ddo /2 symbol parameter condition min. typ. max. units f out output frequency 125 mhz f ref reference input frequency 15 mhz t r /t f lvcmos output rise/fall time 20% ? 80% 100 300 500 ps odc output duty cycle 45 50 55 % t lock pll lock time 20 ms t jit ( ? ) rms phase jitter (6) integration range (1.875mhz ? 20mhz) integration range (12khz ? 20mhz) 85 320 fs spurious noise components 5mhz 10mhz 20mhz 25mhz -73 -82 -89 -96 dbc notes : 1. permanent device damage may occur if absolute maximum rati ngs 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 the 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 after thermal equilibrium has been est ablished. 5. all phase-noise measurements were taken with an agilent 5052b phase-noise system. 6. ref_in driven with a low-noise source clockworks sm802001 prog rammed for a 15mhz cmos output. phase noise will track the in put phase noise up to about 1mhz offset frequency.
micrel, inc. sm802124 september 2011 6 m9999-101311-b hbwhelp@micrel.com or (408) 955-1690 phase noise plots phase noise plot: 125mhz, 1.875mhz ? 20mhz 73fs phase noise plot: 125mhz, 12khz ? 20mhz 318fs
micrel, inc. sm802124 september 2011 7 m9999-101311-b hbwhelp@micrel.com or (408) 955-1690 timing diagrams figure 1. duty cycle timing figure 2. all outputs rise/fall time figure 3. rms phase/noise jitter
micrel, inc. sm802124 september 2011 8 m9999-101311-b hbwhelp@micrel.com or (408) 955-1690 input and output stage figure 4. cmos output load and test circuit
micrel, inc. sm802124 september 2011 9 m9999-101311-b hbwhelp@micrel.com or (408) 955-1690 package information 24-pin package type micrel, inc. 2180 fortune drive san jose, ca 95131 usa tel +1 (408) 944-0800 fax +1 (408) 474-1000 web h u http://www.micrel.com u h 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 its 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 fa ilure to perform can be reasonably expected to result in a si gnificant 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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