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. sy56028 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 regis tered 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 -040810 -a hbwhelp@micrel.com or (408) 955 - 1690 general description the sy560 28xr 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 sy56028 xr can pr ocess clock signals as fast as 4.5 ghz or data patterns up to 6.4 gbps. the d ifferential input includes mic rel?s 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 sy56028 xr 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 industria l temperature range ( ? 40c to +85c). the sy56028 xr is part of micrel?s high - speed, precision edge ? product line. data sheets and support documentation can be found on micrel?s web site at: www.micrel.com . applic ations ? 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: ? dc- to > 6.4gbps throughput ? <36 0ps propagation delay (in - to - q) ? <15ps within - device skew ? ultra - low jitter design ? <0.8ps rms random jitter ? <10ps pp deterministic jitter ? 2.5v 5% , 1.8/1.2 v 5% power supply operation ? industrial temperature range: ? 40c to +85c ? available in 32- pin (5mm x 5 mm) qfn package functional block diagram
micrel, inc. sy56028 xr april 2010 2 m9999 -0408 10 -a hbwhelp@micrel.com or (408) 955 - 1690 ordering information (1) part number package type operating range package marking lead f inish sy560 28xr mg qfn -32 industrial sy56028x with pb - free bar - line indicator nipdau pb - free sy560 28xr mgtr (2) qfn -32 industrial sy56028x 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
micrel, inc. sy56028 xr april 2010 3 m9999 -0408 10 -a hbwhelp@micrel.com or (408) 955 - 1690 p in description pin number pin name pin function 1,3 5,7 25,27 29,31 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 vt 0 vt1 vt2 vt3 input termination center - tap: each side of the diffe rential 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 allow 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. 4,8,9,24,28,32 gnd, exposed pad ground: expo sed 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 39 0mv. see ?functional desc ription? subsection 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
micrel, inc. sy56028 xr april 2010 4 m9999 -0408 10 -a hbwhelp@micrel.com or (408) 955 - 1690 a bsolute 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 ............................................................... <0.5 v input voltage (v in ) ............................. ? 0.5v to v cc +0.4v cml output voltage (v out ) ............................ 0. 6 v to 3v current (v t ) source or sink on vt pin ............................. 100ma in put current source or sink current on (in, /in) ................ 50ma maximum operating junction temperature .......... 125c lead temperature (soldering, 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 ) ............................................ 50 c/w junction - to - board ( jb ) ......................... 2 0 c/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 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 ? 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 stress 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 ratings. 3. package thermal resistance assumes exposed pad is soldered (or equivalent) to the device's most negative potential on the pcb . jb and ja values are determined for a four - 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 speci fied when v t is floating.
micrel, inc. sy56028 xr april 2010 5 m9999 -0408 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 = ? 40c to +85c, unless otherw ise 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 ? lvttl/cmos 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 2.0 v cc v v il input low vo ltage 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 = ? 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 aft er thermal equilibrium has been established.
micrel, inc. sy56028 xr april 2010 6 m9999 -0408 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 = ? 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 210 280 360 ps figure 1b 1 n s 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 d ata 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, temperature 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 . 1 1 . deterministic jitter is measured with 2 23 ? 1 prbs pattern.
micrel, inc. sy56028 xr april 2010 7 m9999 -0408 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 o utput with 50 ohms to 1.2v , not 100 ohms differentially across the outputs . if ac coupling is used, f igure 5d, terminate into 50 ohms to 1.2v before the coupling cap acitor and then connect to a high value resistor to a reference voltage. any unused outpu t pair with vcco at 1.2v needs 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 ohms to 1.8v or 100 ohms differentially across the outputs. ac - or dc - co upling is fine. for best signal integrity, 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 depe nding on input data )
micrel, inc. sy56028 xr april 2010 8 m9999 -0408 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 s wing
micrel, inc. sy56028 xr april 2010 9 m9999 -0408 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 (d c - 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
micrel, inc. sy56028 xr april 2010 10 m9999 -0408 10 -a hbwhelp@micrel.com or (408) 955 - 1690 cml output termination figure 5a. 1.2v, 1.8v , 2.5v cm l dc - coupled termination figure 5b. 1. 8 v , 2.5v cml dc - coupled termination figure 5c. cml ac - coupled termination figure 5d. cml ac - coupled termination v cco 1.8v , 2.5v only v cco 1.2v only
micrel, inc. sy56028 xr april 2010 11 m9999 -0408 10 -a hbwhelp@micrel.com or (408) 955 - 1690 p ackage 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 acc urate and reliable. however, no responsibility is assumed by micrel for its use. micrel reserves the right to change circuitry and specifications at any time without notification to the customer. micrel products are not designed or authorized for use as c omponents 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 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 reasonably expected to result in a significant injury to the user. a purchaser?s use or sale of micrel products for use in life support appliances, 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. ? 2010 micrel, incorporated.

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