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sy56 572 xr low voltage 1.2v /1.8v /2.5v cml 4:1 mux with 1:2 fanout 6.4 g bps 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 april 2010 m9999 - 0415 10 -a hbwhelp@micrel.com or (408) 955 - 1690 general description the sy 56572xr is a fully differential, low voltage 1.2v/1.8v / 2.5v cml 4:1 mux, with input equalization, and integrated 1:2 fanout buffer . the sy 56572xr can pr ocess clock signals as fast as 4.5ghz or data patterns up to 6.4gbps. the differential input includes mic rels unique 3- pin input termination architecture that interfaces to dc - coupled 2.5v/3.3v lvpecl, 1.2v/1.8v/2.5v cml or lvds differential signals. for ac - couple d input applications, an internal voltage reference is provided fo r input bias . input voltages as small as 200mv (400mv pp ) are applied before the 9, 18 or 27 - inch fr4 transmission line. the sy 56572xr operates from a 2.5v 5% core supply and a 1.2v, 1.8 v or 2.5 v 5% output supply and is guaranteed over the full industrial temperature range (C 40c to +85c). the sy 56572xr is part of micrels high - speed, precision edge ? product line. data sheets and support documentation can be found on micrels web site at: www.micrel.com . applications ? data distribution ? sonet clock and data distribution ? fiber channel clock and data distribution ? gigabit ethernet clock and data distribution precision edge ? features ? 1.2v/1.8v/2.5v cml 4:2 mux with input equalization . ? guaranteed ac performance over temperature and voltage: C dc - to > 6.4gbps throughput C <36 0ps propagation delay (in - to - q) C <15ps within - device skew ? ultra - low jitter design C <0.8ps rms random jitter C <10ps pp deterministic jitter ? 2.5v 5% , 1.8/1.2v 5% power supply operation ? industrial temperature range: C 40c to +85c ? available in 32 - pin (5mm x 5 mm) qfn package functional block diagram downloaded from: http:///
micrel, inc. sy 56572xr april 2010 2 m9999 -04 15 10 -a hbwhelp@micrel.com or (408) 955 - 1690 ordering information (1) part number package type operating range package marking lead f inish sy 56572xr mg qfn - 32 industrial sy56 572 x with pb -free bar - line indicator nipdau pb-free sy 56572xr mgtr (2) qfn - 32 industrial sy56 572 x 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 32 -pin qfn downloaded from: http:///
micrel, inc. sy 56572xr april 2010 3 m9999 -04 15 10 -a hbwhelp@micrel.com or (408) 955 - 1690 pin description pin number pin name pin function 1,4 5,8 25,28 29,32 in 0 , /in 0 in1, /in1 in2, /in2 in3, /in3 differential input s : accepts differential sign als as small as 200mv (400mv pp ) applied to the input of a 9, 18 or 27 inch 6mil fr4 stripline transmission line. see input and output stage section for details of this input. 2 6 26 30 vt0 vt1 vt2 vt3 input termination center - tap: each side of the differential input pair terminates to the vt pin. this pin provides a center - tap to a termination network for maximum interface flexibility. an internal high impedance resistor divider biases vt to all ow input ac coupling. for ac coupling, bypass vt with 0. 1f low esr capacitor to vcc. see input interface applications subsection and figure 2a. 19 eq three level input for equalization control. 15 18 sel0 sel1 single - ended ttl/cmos compatible input selects the inputs to the multiplexer. this input is inte rnally connected to a 25k ? pull - up resistor and will default to a logic high state if left open. input logic threshold is vcc/2. see truth table for select control. 16,17 vcc positive power supply: bypass with 0.1uf//0.01uf low esr capacitors as close t o the v cc pin as possible. supplies the input and core circuitry. 10,13,20,23 vcco output supply: bypass with 0.1uf//0.01uf low esr capacitors as close to the v cco pin as possible. supplies the output buffers. 9,24 gnd, exposed pad ground: exposed pad must be connected to a ground plane that is the same potential as the ground pins. 12,11 22,21 q0, /q0 q1, /q1 cml differential output pair: differential buffered copy of the input signal. the output swing is typically 390mv. see functional description s ubsection for termination information. truth table eq input e qualization fr4 6mil stripline low 9 float 18 high 27 sel1 sel0 0 0 in0 input selected 0 1 in1 input selected 1 0 in2 input selected 1 1 in3 input selected downloaded from: http:///
micrel, inc. sy 56572xr april 2010 4 m9999 -04 15 10 -a hbwhelp@micrel.com or (408) 955 - 1690 absolute ma ximum ratings (1) supply voltage (v cc ) ............................... C 0.5v to +3 .0v supply voltage (v cco ) ............................. C 0.5v to +3.0v v cc -v cco ................................................................ <1.8v v cco -v cc ............................................................... <0.5 v input voltage (v in ) ............................. C 0.5v to v cc +0.4v cml output voltage (v out ) ............................ 0. 6v to 3v current (v t ) source or sink on vt pin ............................. 100ma input curren t source or sink current on (in, /in) ................ 50ma maximum operating junction temperature .......... 125c lead temperature (soldering, 20sec.) .................. 260c storage temperature (t s ) .................... C 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 ) ................... C 40c to +85c package thermal resistance (3) qfn still - air ( ja ) ............................................ 50 c/w junction - to - board ( jb ) ......................... 20 c/w dc electrical characteristics (4 ) t a = C 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 v v v i cc power supply current m ax. v cc 110 140 ma i cco power supply current no load. v cco 32 42 ma r diff_in differential input resistance (in- to - /in) 90 100 110 ? v ih input high voltage (in, /in) in, /in 1.2 v cc +0.4 v v il input low voltage (in, /in) in, /in 0 v ih C 0.2 v v in input voltage swing (in, /in) s ee figure 3a, note 5 , applied to input of transmission line. 0.2 1. 0 v v diff_in differential input voltage swing (|in - /in|) s ee figure 3b , note 5 , 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 st ress rating only and functional oper ation is not implied at conditions other than those detailed in the operational sections of this data sheet. exposure to absolute maximum ratings conditions for extended periods may affect device reliability. 2. the data sheet limits are not guaranteed if the device is operated beyond the operating r atings. 3. package thermal resistance assumes exposed pad is soldered (or equivalent) to the device's mos t negative potential on the pcb . jb and ja values are determined for a 4 - layer board in still - 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 established . 5 . v in (max) is specifie d when v t is floating. downloaded from: http:///
micrel, inc. sy 56572xr april 2010 5 m9999 -04 15 10 -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 = C 40c to +85c, unless otherwise stated. symbol parameter condition min typ max units v oh output high voltage r l = 50 ? to v cc o 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 60 0 78 0 950 mv r ou t output source impedance 45 50 55 ? lvttl/cmos dc electrical characteristics (6) v cc = 2.375v to 2.625v; t a = C 40c to +85c, unless otherwise stated. symbol parameter condition min typ max units v ih input high voltage 2.0 v cc v v il input low volta ge 0.8 v i ih input high current - 125 30 a i il input low current - 300 a three level eq input dc electrical characteristics (6) v cc = 2.375v to 2.625v; t a = C 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: 6. the circuit is designed to meet the dc specifications shown in the above table after t hermal equilibrium has been established. downloaded from: http:///
micrel, inc. sy 56572xr april 2010 6 m9999 -04 15 10 -a hbwhelp@micrel.com or (408) 955 - 1690 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 = C 40c to +85c, unless otherwise stated. symbol parameter condition min typ max units f max maximum frequency nrz data 6.4 gbps v out > 200mv ( clock ) 4.5 ghz t pd propagation delay (in - to - q) (sel- to - q) note 7, figure 1a 210 28 0 36 0 ps figure 1b 1 ns t skew output - to - output skew note 8 3 15 ps part- to - part skew note 9 100 ps t jitter data random jitter note 10 0.8 ps rms data deterministic jitter note 1 1 10 ps pp t r t f output rise/fall time (20% to 80%) at full output swing. 30 55 85 ps duty cycle differential i/o 45 55 % notes: 7. propagation delay is measured with no attenuating transmission line connected to the input. 8. output - to - output skew is the difference in time between both outputs under identical input transition, tempera ture and power supply 9. part - to - part skew is defined for two parts with identical power supply voltages at the same temperature and no skew at the edges at the respective inputs. 10 . random jitter is additive jitter . 11. deterministic jitter is measured with 2 23 C 1 prbs pattern. downloaded from: http:///
micrel, inc. sy 56572xr april 2010 7 m9999 -04 15 10 -a hbwhelp@micrel.com or (408) 955 - 1690 functional description cml output termination with v cco 1.2v for v cco of 1.2v , f igure 5a , terminate the output with 50 ? to 1.2v, not 100 ? differentially across the outputs . if ac coupling is used, f igure 5d, terminate into 50 ? to 1.2v before the coupling cap acitor and then connect to a high value resistor to a reference voltage. any unused output pair with vcco at 1.2v n eeds to be terminated, do not leave float ing . cml output termination with v cco 1.8v , 2.5v for vcco of 1.8v or 2.5v , f igure 5a/b, terminate with either 50 ? to 1.8v or 100 ? differentially across the outputs. ac - or dc - coupling is fine. for best signal in tegrity, terminate any unused output pairs. timing diagrams figure 1 a. in -to- q timing diagram figure 1b. sel-to- q timing diagram ( qx state can be high or low depending on input data ) downloaded from: http:///
micrel, inc. sy 56572xr april 2010 8 m9999 -04 15 10 -a hbwhelp@micrel.com or (408) 955 - 1690 input and output stage figure 2a. simplified differential input buffer figure 2b. simplified cml output buffer single-ended and differential swings figure 3a. single - ended swing figure 3b. differential swing downloaded from: http:///
micrel, inc. sy 56572xr april 2010 9 m9999 -04 15 10 -a hbwhelp@micrel.com or (408) 955 - 1690 input interface applications figure 4a. cml interface 100 ? differential (dc - coupled , 1.8v, 2.5v ) figure 4b. cml interface 50 ? -to- vcc (dc- coupled , 1.2v ,1.8v,2.5v ) figure 4c . cml interface (ac - coupled ) *see note in functional description for 1.2v cml driver with ac -c oupling. figure 4d. lvpecl interface (ac - coupled ) figure 4e . lvpecl interface (dc - coupled 2.5v and 3.3v ) figure 4f . lvds interface downloaded from: http:///
micrel, inc. sy 56572xr april 2010 10 m9999 -04 15 10 -a hbwhelp@micrel.com or (408) 955 - 1690 cml output termination figure 5a. 1.2v, 1.8v , 2.5v cml dc - coupled termination figure 5b. 1. 8v , 2.5v cml dc - coupled termination figure 5c. cml ac - coupled termination . figure 5d. cml ac - coupled termination. vcco 1.8v , 2.5v only. vcco 1.2v only. downloaded from: http:///
micrel, inc. sy 56572xr april 2010 11 m9999 -04 15 10 -a hbwhelp@micrel.com or (408) 955 - 1690 package information 32 -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 the information furnished by micrel in this data sheet is believed to be accurate and reliable. however, no responsibility is assum ed by micrel for its use. micrel reserves the right to change circuitry and specifications at any ti me without notification to the customer. micrel products are not designed or authorized for use as components in life support appliance s, devices or systems where mal function of a product can reasonably be expected to result in personal injury. life support devices or systems ar e devices 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 r easonably 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, devices or systems is a purchasers own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such us e or sale. ? 2010 micrel, incorporated. downloaded from: http:///

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