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sy56216r low voltage 1.2v/1.8v/2.5v cml dual channel buffer 4.5ghz/6.4gbps with equalization precision edge is a register ed trademarks 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 sy56216r is a fully-di fferential, low-voltage 1.2v/1.8v/2.5v cml dual channel buffer with input equalization. the sy56216r 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 80ps. the sy56216r 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 sy56216r 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 dual channel buffer ? guaranteed ac performance over temperature and voltage: ? dc-to > 6.4gbps data throughput ? dc-to > 4.5ghz clock throughput ? <280ps propagation delay (in-to-q) ? <20ps within-device skew ? <80ps rise/fall times ? 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. sy56216r november 2010 2 m9999-111810-a hbwhelp@micrel.com ordering information (1) part number package type operating range package marking lead finish SY56216RMG qfn-16 industrial r216 with pb-free bar-line indicator nipdau / pb-free SY56216RMGtr(2) qfn-16 industrial r216 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 setting equalization fr4 6 mil stripline low 9 ? float 18? high 27? or (408) 955-1690
micrel, inc. sy56216r november 2010 3 m9999-111810-a hbwhelp@micrel.com or (408) 955-1690 pin description pin number pin name pin function 16,1 4,5 in0, /in0 in1, /in1 differential inputs: signals as small as 200mvpk (400mv pp ) applied to the input of 9, 18 or 27 inches 6 mil fr4 stripline transmission line are then terminated the differential input . each input pin internally terminates with 50 ? to the vt pin. 2,3 vt0, vt1 input termination center-tap: each side of the differential input pair terminates to a vt pin. this pin provides a center-tap to a terminatio n network for maximum interface flexibility. an internal high-impedance resistor divider biases vt to allow input ac coupling. for ac coupling, bypass vt with 0.01f low-esr capacit or to vcc. see ?interface applications? subsection and figure 2a. 15,6 eq0, eq1 three level inputs for equal ization control. low, float, high 7 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. 14 gnd, exposed pad ground: exposed pad must be connected to a groun d plane that is the same potential as the ground pins. 12,11 10,9 q0, /q0 q1, /q1 cml differential output pairs: differential buffe red copy of the input signal. the output swing is typically 390mv. see ?interface applicat ions? subsection for termination information.
micrel, inc. sy56216r 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 (5) 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 . 72 105 ma i cco power supply current no load. maximum v cco . 32 42 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 deta iled in the operational sections of this data sheet. exposure to absolute maximum ra tings 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 (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 still-air number, unless otherwise stated. 4. due to the limited drive capability, use for input of the same package only. 5. the circuit is designed to meet the dc specifications shown in the above table after thermal equilibrium has been establishe d.
micrel, inc. sy56216 r november 2010 5 m9999-111810-a hbwhelp@micrel.com or (408) 955-1690 cml outputs dc electrical characteristics (6) 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_out 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 (6) 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 v il input low voltage 0 v ee + 0.3 v i ih input high current vih = v cc 400 ua i il input low current vil =gnd 450 ua note: 6. 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, figure 1 100 180 280 ps within device skew note 7 4 20 ps t skew part-to-part skew note 8 100 ps random jitter note 9 1 ps rms t jitter crosstalk induced jitter (adjacent channel) note 10 0.7 ps pp t r t f output rise/fall times (20% to 80%) at full output swing. 20 50 80 ps notes: 7. within device skew is the difference in t pd between the two channels under identical input transition, temperature and power supply. 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 . 10. crosstalk induced jitter is defined as the added jitter that results from signal s applied to the adjacent channel. it is me asured at the output while applying a similar, differential clock frequency that is asynchr onous with respect to each other at the adjacent input.
micrel, inc. sy56216 r november 2010 6 m9999-111810-a hbwhelp@micrel.com interface applications for input interface applications see figures 4a through 4e. for cml output termination see figures 5a through 5d 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 1.8v/2.5v v cco for vcco of 1.8v or 2.5v, figure 5a and figure 5b, terminate with either 50 ? -to-v cco or 100 ? differentially across the outputs. ac- or dc-coupling is fine. see figure 5c for ac-coupling. input ac-coupling the sy56216r input can accept ac-coupling from any driver. bypass vt with a 0.1f low esr capacitor to vcc as shown in figures 4b and 4c. vt has an internal high impedance resistor divider as shown in figure 2a, to provide a bias voltage for ac-coupling. input termination from 1.8v cml driver. terminate with vt tied to 1.8v. do not terminate 100 ohms differentially. from 2.5v cml driver. terminate with either vt tied to 2.5v or 100 ohms differentially. the input cannot be dc-coupled from a 1.2v cml driver. timing diagrams figure 1. propagation delay or (408) 955-1690
micrel, inc. sy56216 r november 2010 7 m9999-111810-a hbwhelp@micrel.com typical characteristics v cc = 2.5, v cco =1.2v, gnd = 0v, v in = 160mv, r l = 50? to 1.2v, t a = 25c, unless otherwise stated. or (408) 955-1690
micrel, inc. sy56216 r 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. sy56216 r 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 (ac-coupled) figure 4c. lvpecl interface (ac-coupled) figure 4d. lvpecl interface (dc-coupled) figure 4e. lvds interface or (408) 955-1690
micrel, inc. sy56216 r 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 only) 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. sy56216 r 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 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 failure to perform can be reasonably expected to result in a significant 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 a nd purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2008 micrel, incorporated. or (408) 955-1690

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