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sm802123 clockworks ? 125mhz/25mhz ultra-low jitter, lvcmos 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 m9999-012312-a hbwhelp@micrel.com or (408) 955-1690 general description the sm802123 is a member of the clockworks ? family of devices from micrel and provides an extremely low-noise timing solution. it is based upon a unique patented rotarywave ? architecture that provides very-low phase noise. the device operates from a 2.5v or 3.3v power supply and synthesizes 16 lvcmos output clocks, eight at 125mhz and eight at 25mhz. the sm802123 accepts a 25mhz lvcmos reference input. data sheets and support documentation can be found on micrel?s web site at: www.micrel.com . features ? generates eight lvcmos output clocks at 125mhz and eight lvcmos output clocks at 25mhz ? 2.5v or 3.3v operating range ? typical phase jitter @ 125mhz (1.875mhz to 20mhz): 115fs ? industrial temperature range ? green, rohs, and pfos compliant ? available in 44-pin 7mm 7mm qfn package applications ? gigabit ethernet ? (gbe) ________________________________________________________________________________________________ block diagram top level schematic
micrel, inc. sm802123 january 2012 2 m9999-012312-a hbwhelp@micrel.com or (408) 955-1690 ordering information part number marking shipping junction temperature range (1) package sm802123umg 802123 tray ?40c to +85c 44-pin qfn SM802123UMGTR 802123 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, q2 q3, q4 /q5, /q6 /q7, /q8 o, (dif) lvcmos clock outputs from bank 1 (25mhz) . 41, 42 1, 2 4, 5 7, 8 q9, q10 /q11, /q12 /q13, /q14 q15, q16 o, (dif) lvcmos clock outputs from bank 2 (125mhz). 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. 3, 6, 40 vsso2 pwr power supply ground for the outputs on bank 2. 11, 14, 18, 19, 20, 27, 30, 34 test factory test pins. do not connect anything to these pins. 12, 13 vdd pwr core power supply. 10, 21, 23 vss (exposed pad) pwr core power supply ground. the exposed pad must be connected to the vss ground plane.
micrel, inc. sm802123 january 2012 3 m9999-012312-a hbwhelp@micrel.com or (408) 955-1690 pin description (continued) pin number pin name pin type pin level pin function 17 ref_in i, (se) lvcmos reference clock input 9 pll_bypass i, (se) lvcmos pll bypass, selects output source 0 = normal pll operation 1 = output from input reference clock 45k ? pull-down 15 oe1 i, (se) lvcmos output enable, q1-/q8 disables to tri-state, 0 = disabled, 1 = enabled, 45k ? pull-up 22 oe2 i, (se) lvcmos output enable, q9-q16 disables to tri-state, 0 = disabled, 1 = enabled, 45k ? pull-up truth table oe1/2 outputs 0 tri-state 1 lvcmos
micrel, inc. sm802123 january 2012 4 m9999-012312-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 )???.??? ........... ?0.5v to v dd +0.5v lead temperature (solder ing, 20s.) ........................... 260c case temper ature ..................................................... 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 3.3v operating voltage v ddo1 = v ddo2 3.135 3.3 3.465 v 2.5v operating voltage v ddo1 = v ddo2 2.375 2.5 2.625 v i dd total supply current outputs floating 130 170 ma lvcmos input (oe1, oe 2, 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 in 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 lvcmos output dc elect rical 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 /2 symbol parameter condition min. typ. max. units v oh output high voltage figure 4 v ddo ? 0.7 v v ol output low voltage figure 4 0.6 v 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 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 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.
micrel, inc. sm802123 january 2012 5 m9999-012312-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 = ? 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 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 + 85 c. r l = 50 ? to v ddo /2 symbol parameter condition min typ max units f out output frequency q1 ? /q8 25 mhz q9 ? q16 125 t r /t f lvcmos output rise/fall time 20% ? 80%, fig. 2 100 200 500 ps odc output duty cycle 45 50 55 % t lock pll lock time 20 ms t jit ( ? ) rms phase jitter (6) (output = 25mhz) integration range:(12khz ? 5mhz) 5mhz limited by phase-noise system. 315 fs rms phase jitter (6) (output = 125mhz) integration range:(12khz ? 20mhz) 340 fs integration range:(1.875mhz ? 20mhz) 115 fs spurious noise components 25mhz ? 64 dbc notes: 1. all phase-noise measurements were taken with an agilent 5052b phase-noise system. 2. ref_in driven with a low-noise source clockworks tm sm802001 programmed for a 25mhz cmos output. phase noise will track the input phase noise up to about 1mhz offset frequency.
micrel, inc. sm802123 january 2012 6 m9999-012312-a hbwhelp@micrel.com or (408) 955-1690 phase noise plots 125mhz lvcmos integrated jitter 12khz ? 20mhz 339fs 125mhz lvcmos integrated jitter 1.875mhz ? 20mhz 114fs
micrel, inc. sm802123 january 2012 7 m9999-012312-a hbwhelp@micrel.com or (408) 955-1690 phase noise plots (continued) 25mhz lvcmos integrated jitter 12khz ? 5mhz 315fs input source (25mhz lvcmos) programmed from a clockworks tm part
micrel, inc. sm802123 january 2012 8 m9999-012312-a hbwhelp@micrel.com or (408) 955-1690 phase noise plots (continued) 125mhz lvcmos output waveform 25mhz lvcmos output waveform
micrel, inc. sm802123 january 2012 9 m9999-012312-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 figure 4. lvcmos output load and test circuit
micrel, inc. sm802123 january 2012 10 m9999-012312-a hbwhelp@micrel.com or (408) 955-1690 package information 44-pin package type (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 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. ? 2012 micrel, incorporated.
micrel, inc. sm802123 january 2012 11 m9999-012312-a hbwhelp@micrel.com or (408) 955-1690 revision template history date change description/edits by: rev. 8/4/10 added new paragraph to disclaimer in boi ler plate. per colin sturt. m.galvan 14
micrel, inc. sm802123 january 2012 12 m9999-012312-a hbwhelp@micrel.com or (408) 955-1690 hbw datasheet revision history part number: initial release date: rev. date revisions reason engineer a

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