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sy56020r low voltage 1.2v/1.8v/2.5v cml 1:4 fanout buffer 6.4gbps with equalization 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 general description the sy56020r is a fully-differential, low-voltage 1.2v/1.8v/2.5v cml 1:4 fanout buffer with input equalization. the sy56020r can process clock signals as fast as 4.5ghz or data patterns up to 6.4gbps. the differential input includes micrel?s unique, 3-pin input termination architecture that interfaces to cml differential signals, without any level-shifting or termination resistor networks in the signal path. the differential input can also accept ac-coupled lvpecl and lvds signals. input voltages as small as 200mv (400mv pp ) are applied before the 9?, 18? or 27? fr4 transmission line. for ac-coupled input interface applications, an internal voltage reference is provided to bias the v t pin. the outputs are cml, with extremely fast rise/fall times guaranteed to be less than 90ps. the sy56020r operates from a 2.5v 5% core supply and a 1.2v, 1.8v or 2.5v 5% output supply and is guaranteed over the full industrial temperature range (?40c to +85c). the sy56020r is part of micrel?s high-speed, precision edge ? product line. datasheets and support documentation can be found on micrel?s web site at: www.micrel.com . functional block diagram precision edge ? features ? 1.2v/1.8v/2.5v cml 1:4 fanout buffer ? equalizes 9, 18, 27 inches of fr4 ? guaranteed ac performance over temperature and voltage: ? dc-to > 6.4gbps data throughput ? dc-to > 4.5ghz clock throughput ? <280 ps propagation delay (in-to-q) ? <15ps within-device skew ? <90ps rise/fall times ? ultra-low jitter design ? <1ps rms random jitter ? high-speed cml outputs ? 2.5v 5% v cc , 1.2/1.8v/2.5v 5% v cco power supply operation ? industrial temperature range: ?40c to +85c ? available in 16-pin (3mm x 3mm) qfn package applications ? data distribution ? sonet clock and data distribution ? fiber channel clock and data distribution ? gigabit ethernet clock and data distribution markets ? storage ? ate ? test and measurement ? enterprise networking equipment ? high-end servers ? metro area network equipment november 2010 m9999-111810-a hbwhelp@micrel.com or (408) 955-1690
micrel, inc. sy56020r november 2010 2 m9999-111810-a hbwhelp@micrel.com ordering information part number package type operating range package marking lead finish SY56020RMG qfn-16 industrial r020 with pb-free bar-line indicator nipdau pb-free SY56020RMGtr (2) qfn-16 industrial r020 with pb-free bar-line indicator nipdau pb-free notes: 1. contact factory for die availability. dice are guaranteed at t a = 25c, dc electricals only. 2. tape and reel. pin configuration 16-pin qfn truth table eq equalization fr4 6mil stripline low 9? float 18? high 27? or (408) 955-1690
micrel, inc. sy56020r november 2010 3 m9999-111810-a hbwhelp@micrel.com or (408) 955-1690 pin description pin number pin name pin function 2,3 in, /in differential input: signals as small as 200mv v pk (400mv pp ) applied to the input of 9, 18 or 27 inches 6mil fr4 stripline transmission line are then te rminated with this differential input. each input pin internally terminates with 50 ? to the vt pin. 1 vt input termination center-tap: each si de of the differential input pair terminates to vt pin. this pin provides a center-tap to a termination network for ma ximum interface flexibility. an internal high impedance resistor divider biases vt to allow input ac-coupling. for ac-coupling, bypass vt with 0.1f low-esr capacitor to v cc . see ?interface applications? subsection and figure 2a. 4 eq three level input for equalization control. high, float, low. 16 vcc positive power supply: bypass with 0.1f//0.01f low-esr capacitors as close to the v cc pins as possible. supplies input and core circuitry. 8,13 vcco output supply: bypass with 0.1f//0.01f low-esr capacitors as close to the v cco pins as possible. supplies the output buffers. 5 gnd, exposed pad ground: exposed pad must be connected to a groun d plane that is the same potential as the ground pins. 15,14 12,11 10,9 7,6 q0, /q0 q1, /q1 q2, /q2 q3, /q3 cml differential output pairs: differential buffer ed copy of the input signal. the output swing is typically 390mv. see ?interface applicatio ns? subsection for termination information.
micrel, inc. sy56020r november 2010 4 m9999-111810-a hbwhelp@micrel.com or (408) 955-1690 absolute maximum ratings (1) supply voltage (v cc )............................... ?0.5v to +3.0v supply voltage (v cco ) ............................. ?0.5v to +3.0v v cc ? v cco ..............................................................<1.8v v cco ? v cc ..............................................................<0.5v input voltage (v in ) ....................................... ?0.5v to v cc cml output voltage (v out )......................... 0.6v to 3.0v current (v t ) source or sink on vt pin.............................100ma input current source or sink current on (in, /in) ...............50ma maximum operating junc tion temperature.......... 125c lead temperature (solde ring, 20sec .) .................. 260c storage temperature (t s ) ....................?65c to +150c operating ratings (2) supply voltage (v cc ) .................................. 2.375v to 2.625v (v cco ) ................................... 1.14v to 2.625v ambient temperature (t a )............................?40c to +85c package thermal resistance (3) qfn still-air ( ja )..............................................................75c/w junction-to-board ( jb ) ............................................33c/w dc electrical characteristics (4) t a = ?40c to +85c, unless otherwise stated. symbol parameter condition min. typ. max. units v cc power supply voltage range v cc v cco v cco v cco 2.375 1.14 1.7 2.375 2.5 1.2 1.8 2.5 2.625 1.26 1.9 2.625 v i cc power supply current maximum v cc . 60 85 ma i cco power supply current no load. maximum v cco . 64 84 ma r in input resistance (in-to-v t , /in-to-v t ) 45 50 55 ? r diff_in differential input resistance (in-to-/in) 90 100 110 ? v ih input high voltage (in, /in) in, /in 1.42 v cc v v il input low voltage (in, /in) in, /in 1.22v = 1.7-0.475 1.22 v ih ?0.2 v v in input voltage swing (in, /in) see figure 3a, applied to input of transmission line. 0.2 1.0 v v diff_in differential input voltage swing (|in ? /in|) see figure 3b, applied to input of transmission line. 0.4 2.0 v v t_in voltage from input to v t 1.28 v notes: 1. permanent device damage may occur if absolute maximum ratings are exceeded. this is a stress rating only and functional ope ration is not implied at conditions other than those detailed in the operational sections of this data shee t. exposure to absolute maximum ratings co nditions 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 (or equivalent) to the device's most negative potential on the pc b. jb and ja values are determined for a 4-layer board in st ill-air number, unless otherwise stated. 4. the circuit is designed to meet the dc specifications shown in the above table after thermal equilibrium has been establishe d.
micrel, inc. sy56020r november 2010 5 m9999-111810-a hbwhelp@micrel.com or (408) 955-1690 cml outputs dc electrical characteristics (5) v cco = 1.14v to 1.26v r l = 50 ? to v cco, v cco = 1.7v to 1.9v, 2.375v to 2.625v, r l = 50 ? to v cco or 100 ? across the outputs. v cc = 2.375v to 2.625v; t a = ?40c to +85c, unless otherwise stated. symbol parameter condition min. typ. max. units v oh output high voltage r l = 50 ? to v cco v cc 0.020 v cc 0.010 v cc v v out output voltage swing see figure 3a 300 390 475 mv v diff_ou t differential output voltage swing see figure 3b 600 780 950 mv r out output source impedance 45 50 55 ? three level eq input dc electrical characteristics (5) v cc = 2.375v to 2.625v; t a = ?40c to +85c, unless otherwise stated. symbol parameter condition min. typ. max. units v ih input high voltage v cc 0.3 v cc v v il input low voltage 0 v ee + 0.3 v i ih input high current v ih = v cc 400 a i il input low current v il = gnd 480 a note: 5. the circuit is designed to meet the dc specifications shown in the above table after thermal equilibrium has been establishe d. ac electrical characteristics v cco = 1.14v to 1.26v r l = 50 ? to v cco, v cco = 1.7v to 1.9v, 2.375v to 2.625v, r l = 50 ? to v cco or 100 ? across the outputs, v cc = 2.375v to 2.625v; t a = ?40c to +85c, unless otherwise stated. symbol parameter condition min. typ. max. units nrz data 6.4 gbps f max maximum frequency v out > 200mv clock 4.5 ghz t pd propagation delay in-to-q note 6, figure 1 100 180 280 ps output-to-output skew note 7 3 15 ps t skew part-to-part skew note 8 100 ps t jitter random jitter note 9 1 ps rms t r t f output rise/fall time (20% to 80%) at full output swing. 20 50 90 ps notes: 6. propagation delay is measured with no attenuating trans mission line connected to the input. 7. output-to-output skew is the difference in time between both outputs, receiving data from the same input, for the same tempe rature, voltage and transition. 8. part-to-part skew is defined for two parts with identical pow er supply voltages at the same temperature and no skew at the e dges at the respective inputs. 9. random jitter is measured with a k28.7 pattern, measured at f max .
micrel, inc. sy56020r november 2010 6 m9999-111810-a hbwhelp@micrel.com interface applications for input interface applications see figures 4a-e and for cml output termination, see figures 5a-d. cml output termination with vcco 1.2v for vcco of 1.2v, figure 5a, terminate the output with 50? to 1.2v, dc coupled, not 100 ? differentially across the outputs. if ac-coupling is used, figure 5d, terminate into 50 ? to 1.2v before the coupling capacitor and then connect to a high value resistor to a reference voltage. do not ac-couple with internally terminated receiver. for example, 50 ? any-in input. ac-coupling will offset the output voltage by 200mv and this offset voltage will be too low for proper driver operation. any unused output pair needs to be terminated when vcco is 1.2v, do not leave floating. cml output termination with vcco 1.8v, 2.5v for vcco of 1.8v, figure 5a and figure 5b, terminate either with 50 ohms to vcco or 100 ohms differentially across the outputs. ac- or dc-coupling is fine. for best signal integrity, terminate any unused output pairs. input termination from 1.8v cml driver: terminate input with vt tied to 1.8v. don?t terminate 100 ohms differentially. from 2.5v cml driver: terminate input with either vt tied to 2.5v or 100 ohms differentially. the input cannot be dc-coupled from a 1.2v cml driver. input ac-coupling the sy56020r input can accept ac-coupling from any driver. bypass vt with a 0.1f low-esr capacitor to vcc as shown in figures 4c and 4d. vt has an internal high impedance resistor divider as shown in figure 2a, to provide a bias voltage for ac-coupling. timing diagrams figure 1. propagation delay figure 1. propagation delay or (408) 955-1690
micrel, inc. sy56020r november 2010 7 m9999-111810-a hbwhelp@micrel.com typical characteristics v cc = 2.5, v cco = 1.2v, gnd = 0v, v in = 400mv, r l = 50? to 1.2v, data pattern: 2 23 -1, t a = 25c, unless otherwise stated. or (408) 955-1690
micrel, inc. sy56020r november 2010 8 m9999-111810-a hbwhelp@micrel.com input and output stage figure 2a. simplified differential input buffer figure 2b. simplified cml output buffer single-ended and di fferential swings figure 3a. single-ended swing figure 3b. differential swing or (408) 955-1690
micrel, inc. sy56020r november 2010 9 m9999-111810-a hbwhelp@micrel.com input interface applications figure 4a. cml interface (dc-coupled, 1.8v, 2.5v) option: may connect v t to v cc figure 4b. cml interface (dc-coupled, 1.8v, 2.5v) figure 4c. cml interface (ac-coupled) figure 4d. lvpecl interface (ac-coupled) figure 4e. lvpecl interface (dc-coupled) or (408) 955-1690
micrel, inc. sy56020r november 2010 10 m9999-111810-a hbwhelp@micrel.com cml output termination figure 5a. 1.2v, 1.8v or 2.5v cml dc-coupled termination figure 5b. 1.8v or 2.5v cml dc-coupled termination figure 5c. cml ac-coupled termination (v cco 1.8v or 2.5v) figure 5d. cml ac-coupled termination (v cco 1.2v only) related product and support documents part number function datasheet link hbw solutions new products and termination application notes http://www.micrel.com/page.do?page=/p roduct-info/as/hbwsolutions.shtml or (408) 955-1690
micrel, inc. sy56020r november 2010 11 m9999-111810-a hbwhelp@micrel.com package information 16-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 ? 2008 micrel, incorporated. or (408) 955-1690

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