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sy58031u ultra - precision 1:8 cml fanout buffer with internal i/o termination precision edge is a registered trademark of micrel, 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 october 1 , 20 13 revision 5.0 hbwhelp@micrel.com or (408) 955 - 1690 general description the sy58031u is a 2.5v/3.3v precision, high - speed, fully differential cml 1:8 fanout buffer. the sy58031u is optimized to provide eight identical output copies with less than 20ps of skew and only 75fs rms phase jitter. it can process clock signals as fast as 6ghz. the differential input includes micrels unique, 3 - pin input termination architecture that allows the sy58031u to directly interface to cml, lvpecl, and lvds differential signals (ac - or dc - coupled) without any level - shifting or termination resistor networks in the signal path. the result is a clean, stub - free, low - jitter interfa ce solution. the cml outputs feature 400mv typical swing into 50 loads and provide an extremely fast rise/fall time guaranteed to be less than 60ps. the sy58031u operates from a 2.5v 5% supply or 3.3v 10% supply and is guaranteed over the full industria l temperature range ( C 40c to +85c). for applications that require high - speed 1:8 lvpecl fanout buffers, consider the sy58032u and sy58033u. the sy58031u is part of micrels high - speed, precision edge ? product line. datasheets and support documentation ar e available on micrels web site at : www.micrel.com . block diagram q1/q1 q0/q0 in /in v t 50? 50? v ref-ac q3/q3 q2/q2 q5/q5 q4/q4 q7/q7 q6/q6 precision edge ? features ? precision 1:8, 400mv cml fanout buffer ? guaranteed ac performance over temperature and voltage: ? clock frequency range: dc to >6ghz ? <60ps t r /t f time ? <270ps t pd ? <20ps output - to - output skew ? low - jitter performance: ? 75fs rms phase jitter (typ.) ? 50 source - terminated cml outputs ? 400mv cml output swing into 50 load ? fully differential i/o ? accepts an input signal as low as 100mv ? unique, patent - pending input termination and vt pin accepts dc - coupled and ac - couple differential inputs (lvpecl, lvds, and cml) ? power supply 2.5v 5% or 3.3v 10% ? industrial temperature range: C 40c to +85c ? available in 32 - pin, 5mm 5mm qfn package appl ications ? all sonet and gige clock distribution ? all fibre channel clock and data distribution ? network routing engine timing distribution ? high - end, low - skew multiprocessor synchronous clock distribution downloaded from: http:///
micrel, inc. sy58031u october 1 , 20 13 2 revision 5.0 hbwhelp@micrel.com or (408) 955 - 1690 ordering information part number ( 1 ) package type operating range package marking lead finish SY58031UMG qfn - 32 industrial sy58031u with pb - free bar - line indicator pb- free nipdau SY58031UMGtr ( 2 ) qfn - 32 industrial sy58031u with pb - free bar - line indicator pb- free nipdau note: 1. contact factory for die availability . dice are guaranteed at t a = 25c , dc electricals only. 2. tape and reel. downloaded from: http:///
micrel, inc. sy58031u october 1 , 20 13 3 revision 5.0 hbwhelp@micrel.com or (408) 955 - 1690 pin configuration 32 -pin qfn pin description pin number pin name pin function 3, 6 in , /in differential signal i nput: each pin of this pair internally terminates with 50 to the vt pin. note that this input will default to an indeterminate state if left open. see input int erface applications section. 4 vt input termination center -t ap: each input terminates to this pin. the vt pin provides a center - tap for each input (in, /in) to the termination network for maximum interface fl exibility. see input interface applications section . 2, 7, 17, 24 gnd, exposed pad ground. exposed pad must be connected to a ground plane that is the same potential as the ground pin . 1, 8, 9, 16 18, 23, 25, 32 vcc positive power supply: bypass with 0.1 f/0.01f low esr capacitors as close to the pins as possible 31, 30, 29, 28, 27, 26, 22, 21 20, 19, 15, 14 13, 12, 11, 10 q0, /q0, q1, /q1 q2, /q2. q3, /q3 q4, /q4, q5, /q5 q6, /q6, q7, /q7 cml differential output p airs: differential buffered output copy of the input signal. the cml output swing is typically 400mv into 50. unused output pairs may be left floating with no impact on jitter. see cml output termination section 5 vref-ac bias reference voltage: equal to v cc C 1.2v (typical), and used for ac - co upled applications. see input interface applications section. when using v ref - ac , bypass with 0.01f capacitor to v cc . maximum sink/source current is 0.5ma. downloaded from: http:///
micrel, inc. sy58031u october 1 , 20 13 4 revision 5.0 hbwhelp@micrel.com or (408) 955 - 1690 absolute maximum ratings ( 3 ) power supply voltage (v cc ) ....................... C 0.5v to +4.0v input voltage (vin) ......................................... C 0.5v to vcc current (vt) source or sink current on vt pin .......................... 100ma input current (vt) source or sink current on in, /in ............................ 50ma current (vref) source or sink current on vref - ac ( 5 ) .................. 1.5ma lead temperature (soldering, 20 s) ............................ 260 c storage temperature (ts) ......................... C 65c to +150 c operating ratings ( 4 ) power supply v oltage (v cc ) .................... +2.375 v to + 3.6 v ambient temperature (t a ) .......................... C 40c to +85c junction thermal resistance ( 6 ) qfn ( ja ) , still - air .............................................. 35 c/w qfn ( jb ) , junction - to - board ............................ 20 c/w dc electrical characteristics ( 7 ) t a = C 40c to +85c. symbol parameter condition min . typ . max . units v cc power supply voltage 2.5v nominal 3.3v nominal 2.375 3.0 2.5 3.3 2.625 3.6 v i cc power supply current vcc = max., no lead. includes current through 50 ? pull - ups. 265 330 ma v ih input high voltage in1, /in1, note 8 v cc - 1.6 v cc v v il input low voltage in1, /in1 0 v ih - 0.1 v v in input voltage swing in1, /in1, see figure 1 . 0.1 1.7 v v diff_in differential input voltage swing [in0, /in0], [in1, /in1] in1, /in1, see figure 2 . 0.2 v r in in - to -v t resistance 40 50 60 ? v t in max. in - to -v t (in, /in) 1.28 v v ref - ac v cc - 1.3 v cc - 1.2 v cc - 1.1 v downloaded from: http:///
micrel, inc. sy58031u october 1 , 20 13 5 revision 5.0 hbwhelp@micrel.com or (408) 955 - 1690 cml dc electrical characteristics ( 7 ) v cc = 2.5v 5% or 3.3v 10%; r l = 100 ? across q and /q; t a = C 40c to +85c , unless otherwise stated. symbol parameter condition min . typ . max . units v oh output high voltage v cc - 0.02 v cc v v out output low voltage see figure 1 . 325 400 mv v diff_out differential voltage swing see figure 2 . 650 800 mv r out output source impedance 40 50 60 ? notes: 3. exceeding the absolute maximum ratings may damage the device. 4. the datasheet ratings are not guaranteed if the device is operated beyond the operating ratings. 5. d ue to the limited drive capability, use for input of the same package only . 6. thermal performance assumes exposed pad is soldered (or equivalent) to the devices most negati ve potential (gnd) on the pcb. jb uses 4 - layer ja i n still - air number unless otherwise stated. 7. the device is not guaranteed to function outside its operating ratings. 8. v ih (min.) not lower than 1.2v. ac electrical characteristics ( 9 ) vcc = 2.5v 5% or 3.3v 10%; rl = 100 ? across each output pair or equivale nt ; t a = C 40c to +85c , unless otherwise stated. symbol parameter condition min . typ . max . units f max maximum operating frequency v out 200mv clock 6 ghz t pd propagation delay (in - to - q) 120 230 270 ps t pd tempco differential propagation delay temperature coefficient 35 fs/ c t skew output - to - output (within device) note 10 7 20 ps part- to - part note 11 100 ps t jitter rms phase jitter output: 622mhz integration range 12khz C 20mhz 75 ps t r /t f output rise/fall time 20% to 80% at full output swing. 20 45 60 ps notes: 9. high frequency ac electricals are guaranteed by design and characterization. all outputs loaded, v in 100mv. 10. output - to - output skew is measured between outputs under identical transitions. 11. part - to - part skew is defined for two parts with identical power supply voltages at the same temperature wi th no skew of the edges at the respective inputs. part - to - part skew includes variation in t pd . downloaded from: http:///
micrel, inc. sy58031u october 1 , 20 13 6 revision 5.0 hbwhelp@micrel.com or (408) 955 - 1690 phase noise plot 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -1 10 -120 -130 -140 -150 -160 -170 -180 -190 -200 10 100 1k 10k 100k 1m 10m 100m offset frequenc y (hz) noise power (dbc/hz) phase noise plot: 622mhz @ 3.3v downloaded from: http:///
micrel, inc. sy58031u october 1 , 20 13 7 revision 5.0 hbwhelp@micrel.com or (408) 955 - 1690 typical operating characteristics downloaded from: http:///
micrel, inc. sy58031u october 1 , 20 13 8 revision 5.0 hbwhelp@micrel.com or (408) 955 - 1690 single - ended and differential swings figure 1. single - ended voltage swing figure 2 . differential voltage swing timing diagram downloaded from: http:///
micrel, inc. sy58031u october 1 , 20 13 9 revision 5.0 hbwhelp@micrel.com or (408) 955 - 1690 input buffer figure 3. simplified differential input buffer input interface applications figure 4 . dc - coupled cml input interface optional: may connect v t to v cc figure 5. ac - coupled cml input interface figure 6 . lvpecl input interface figure 7 . ac - coupled lvpecl input interface figure 8 . lvds input interface downloaded from: http:///
micrel, inc. sy58031u october 1 , 20 13 10 revision 5.0 hbwhelp@micrel.com or (408) 955 - 1690 cml output termination figure 9 and figure 10 illustrate how to terminate a cml output using both the ac - and dc - coup led configuration. all outputs of the sy58031u are 50 ? with a 16ma current source. figure 9 . cml dc - coupled termination figure 10 . cml ac - coupled termination related micrel products and support documentation part number function website link sy58031u ultra - precision 1:8 cml fanout buffer with internal i/o termination http://www.micrel.com/_pdf/hbw/sy58031u.pdf sy58032u ultra - precision 1:8 lvpecl fanout buffer with internal termination http://www.micrel.com/_pdf/hbw/sy58032u.pdf sy58033u ultra - precision 1:8 400mv fanout buffer with internal termination http://www.micrel.com/_pdf/hbw/sy58033u.pdf hbw solutions http://www.micrel.com/index.php/en/products/clock - timing.html downloaded from: http:///
micrel, inc. sy58031u october 1 , 20 13 11 revision 5.0 hbwhelp@micrel.com or (408) 955 - 1690 package information ( 12 , 13 ) 32 -pin qfn and pcb thermal consideration for package (always solder, or equivalent, the exposed pad to the pcb) note: 12. package information is correct as of the publication date. for updates and most current information, go to www.micrel.com . 13. package meets level 2 qualification. all parts are dry - packaged before shipment. exposed pads must be soldered to a ground for proper thermal management. downloaded from: http:///
micrel, inc. sy58031u october 1 , 20 13 12 revision 5.0 hbwhelp@micrel.com or (408) 955 - 1690 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 the accuracy or comp leteness of the information furnished in th is 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 express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. except as provided in micrels terms and conditions of sale for such products, mic rel assumes no liability whatsoever, and micrel disclaims any express or implied warranty relating to the sale and/ or use of micrel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any paten t, copyright or other intellectual property right . micrel products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. life support devices or systems are device s or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to res ult in a significant injury to the user. a purchasers use or sale of micrel products for use in life support appliances, devic es or systems is a purchasers own risk a nd purchas er agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 20 13 micrel, incorporated. downloaded from: http:///

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