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sy58606u 4.25gbps precision, 1:2 cml fanout buffer with internal termination and fail safe input general description the sy58606u is a 2.5/3.3v, high - speed, fully differential 1:2 cml fanout buffer optimized to provide two identical output copies with less than 15ps of skew and 100 fs rms of typical additive phase jitter. the sy58 606u can process clock signals as fast as 3ghz or data patterns up to 4.25gbps. the differential input includes micrels unique, 3 - pin input termination architecture that interfaces to lvpecl, lvds or cml differential signals, (ac - or dc - coupled) as small as 100mv (200mv pp ) without any level - shifting or termination resistor networks in the signal path. for ac - coupled input interface applications, an integrated voltage reference (v ref-ac ) is provided to bias the v t pin. the outputs are 400mv cml, with extremely fast rise/fall times guaranteed to be less than 85ps. the sy58606u operates from a 2.5v 5% supply or 3.3v 10% supply and is guaranteed over the full industrial temperature range ( C 40c to +85c). for applications that require lvpecl or lvds outputs, consider micrels sy58607u and sy58608u, 1:2 fanout buffers with 800mv and 325mv output swings respectively. the sy58606u is part of micrels high - speed, precision edge ? product line. datasheets and support documentation can be found on micrels web site at: www.micrel.com . functional block diagram features ? precision 1:2, 400mv cml fanout buffer ? guaranteed ac performance over temperature and voltage: C dc - to > 4.25gbps throughput C <32 0ps propagation delay (in - to - q) C <15ps within - device skew C <85ps rise/fall times ? fail safe input C prevents outputs from oscillating when input is invalid ? ultra - low jitter design C 100fs rms typical additive jitter ? high - speed cml outputs ? 2.5v 5% or 3.3v 10% power supply operation ? industrial temperature range: C 40c to +85c ? available in 16 - pin (3mm x 3mm) qfn package applications ? data distribution: oc - 48, oc - 48+fec, xaui ? sonet clock and data distribution ? fibre channel clock and data distribution ? gigabit ethernet clock and data distribution markets ? storage ? ate ? test and measurement ? enterprise networking equipment ? high - end servers ? access ? me tro area network equipment 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 may 2014 05 1 514 - 4.0 tcg help@micrel.com or (408) 955 - 1690 downloaded from: http:///
micrel, inc. sy58606u ordering information ( 1 ) part number package type operating range package marking lead finish SY58606UMG qfn - 16 industrial 606u with pb - free bar - line indicator nipdau pb- free SY58606UMGtr ( 2 ) qfn - 16 industrial 606u 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 c onfiguration 16- pin qfn pin description pin number pin name pin function 1, 4 in, /in differential input: this input pair is the differential signal input to the device. input accepts dc - coupled differential signals as small as 100mv (200mv pp ). each p in of this pair internally terminates with 50 to the vt pin. if the input swing falls b elow a certain threshold (typical 30mv), the fail safe input (fsi) feature will guarantee a stable output by latching the output to its last valid state. see input interface applications section. 2 vt input termination center - tap: each side of the differential input pair terminates to vt pin. this pin provides a center - tap to a termination network for maximum interface flexibility. see input interface application s section. 3 vref-ac reference voltage: this output biases to v cc C 1.2v. it is used for ac - coupling inputs in and /in. connect vref - ac directly to the vt pin. bypass with 0.01f low esr capacitor to vcc. maximum sink/source current is 1.5ma. see inp ut interface applications section. 5, 8,13, 16 vcc positive power supply: bypass with 0.1uf//0.01uf low esr capacitors as close to the v cc pins as possible. 6, 7, 14, 15 gnd, exposed pad ground: exposed pad must be connected to a ground plane that is the same potential as the ground pins. 9, 10 11, 12 /q1, q1 /q0, q0 cml differential output pairs: differential buffered copies of the input signal. the output swing is typically 400mv. unused output pair may be left floating with no impact on jitter . see cml output termination section. may 2014 2 05 1 514 - 4.0 tcg help@micrel.com or (408) 955 - 1690 downloaded from: http:///
micrel, inc. sy58606u absolute maximum ratings ( 3 ) supply voltage (v cc ) ................................ . C 0.5v to +4.0v input voltage (v in ) ........................................ C 0.5v to v cc cml output voltage (v out ) ............ v cc - 1.0v to v cc +0.5v current (v t ) source or sink on v t pin ............................... 100ma input current source or sink current on (in, /in) ................. 50ma current (v ref ) source or sink current on v ref-ac ( 6 ) ................ 1.5ma maximum operating junction temperature ............ 125c lead temperature (soldering, 20sec.) .................... 260c storage temperature (t s ) ..................... C 65c to +150 c operating ratings ( 4 ) supply voltage (v in ) ...................... +2.375v to +3.60v ambient temperature (t a ) .................. C 40c to +85c package thermal resistance ( 5 ) qfn still - air ( ja ) .......................................... 60c/w junction - to - board ( jb ) ....................... 33c/w dc electrical characteristics ( 7 ) t a = C 40c to +85c, unless otherwise stated. symbol parameter condition min typ max units v cc power supply voltage range 2.375 3.0 2.5 3.3 2.625 3.6 v i cc power supply current no load, max. v cc 60 77 ma r diff_in differential input resistance (in- to - /in) 90 100 110 ? v ih input high voltage (in, /in) in, /in, note 9 v cc C 1.6 v cc v v il input low voltage (in, /in) in, /in 0 v ih C 0.1 v v in input voltage swing (in, /in) s ee figure 5 , note 8 0.1 1.7 v v diff_in differential input voltage swing (|in - /in|) s ee figure 6 0.2 v v in_f si input voltage threshold that triggers fsi 30 100 mv v ref - ac output reference voltage v cc C 1.3 v cc C 1.2 v cc C 1.1 v v t_in voltage from input to v t 1.28 v notes: 3. permanent device damage may occur if absolute maximum ratings are exceeded. this is a stress rating only and functional operation i s 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. 4. the data sheet limits are not guaranteed if the device is operated beyond the operating ratings. 5. 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 4-layer board in still-air number, unless otherwise stated. 6. due to the limited drive capability, use for input of the same package only. 7. the circuit is designed to meet the dc specifications shown in the above table after thermal equilibrium has been established. 8. v in (max) is specified when v t is floating. 9. v ih (min) not lower than 1.2v. may 2014 3 05 1 514 - 4.0 tcg help@micrel.com or (408) 955 - 1690 downloaded from: http:///
micrel, inc. sy58606u cml outputs dc electrical characteristics ( 10 ) v cc = +2.5v 5% or +3.3v 10%, r l = 100? across the outputs; 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 v cc - 0.020 v cc - 0.010 v cc v v out output voltage swing see figure 5 325 400 mv v diff_out diffe rential output voltage swing see figure 6 650 800 mv r out output source impedance 45 50 55 ? note: 10. the circuit is designed to meet the dc specifications shown in the above table after thermal equilibrium has been established. ac electrical cha racteristics v cc = +2.5v 5% or +3.3v 10%, r l = 100? across the outputs, input t r /t f : < 300ps; t a = C 40c to +85c, unless otherwise stated. symbol parameter condition min typ max units f max maximum frequency nrz data 4.25 gbps v out > 200mv clock 2.5 3.0 ghz t pd propagation delay in - to -q v in : 100mv - 200mv 150 270 400 ps v in : 200mv - 800mv 120 220 320 ps t skew within device skew note 11 3 15 ps part- to - part s kew note 12 100 ps t jitter additive jitter carrier = 622mhz integration range: 12khz C 20mhz 100 fs rms t r t f output rise/fall time (20% to 80%) at full output swing. 30 50 85 ps duty cycle differential i/o 47 53 % notes: 11. within device skew is measured between two different outputs under identical input transitions. 12. 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. may 2014 4 05 1 514 - 4.0 tcg help@micrel.com or (408) 955 - 1690 downloaded from: http:///
micrel, inc. sy58606u t ypical characteristics v cc = 3.3v, gnd = 0v, v in = 100mv, r l = 100? across the outputs, t a = 25c, unless otherwise stated. may 2014 5 05 1 514 - 4.0 tcg help@micrel.com or (408) 955 - 1690 downloaded from: http:///
micrel, inc. sy58606u functional characteristics v cc = 2.5v, gnd = 0v, v in = 325mv, data pattern: 2 23 - 1, r l = 100? across the outputs, t a = 25c, unless otherwise stated. may 2014 6 05 1 514 - 4.0 tcg help@micrel.com or (408) 955 - 1690 downloaded from: http:///
micrel, inc. sy58606u functional characteristics (continued) v cc = 2.5v, gnd = 0v, v in = 325mv, r l = 100? across the outputs, t a = 25c, unless otherwise stated. may 2014 7 05 1 514 - 4.0 tcg help@micrel.com or (408) 955 - 1690 downloaded from: http:///
micrel, inc. sy58606u additive phase noise plot v cc = +3.3v , t a = 25c may 2014 8 05 1 514 - 4.0 tcg help@micrel.com or (408) 955 - 1690 downloaded from: http:///
micrel, inc. sy58606u functional description fail - safe input (fsi) the input includes a special fail - safe circuit to sense the amplitude of the input signal and to latch the outputs when there is no input signal present, or when the amplitude of the input signal drops sufficiently below 100mv pk (200mv pp ), typically 30mv pk . maximum frequency of sy58606u is limited by the fsi function. input clock failure case if the input clock fails to a floating, static, or extremely low signal swing, then the fsi function will eliminate a metastable condition and guarantee a stable output. no ringing and no undetermined state will occur at the output under these conditions. note that the fsi function will not prevent duty cycle distortion in case of a slowly deteriorating (but still toggling) input signal. due to the fsi function, the propagation delay will depend on rise and fall time of the input signal and on its amplitude. refer to typical characteristics for detailed information. timing diagrams figure 1. propagation delay figure 2 . fail safe feature may 2014 9 05 1 514 - 4.0 tcg help@micrel.com or (408) 955 - 1690 downloaded from: http:///
micrel, inc. sy58606u input and output stage figure 3 . simplified differential input buffer figure 4 . simplified cml output buffer single - ended and differential swings figure 5. single- ended swing figure 6. differential swing may 2014 10 05 1 514 - 4.0 tcg help@micrel.com or (408) 955 - 1690 downloaded from: http:///
micrel, inc. sy58606u input interface applications figure 7. cml interface (dc - coupled) option: may connect v t to v cc figure 8. cml interface (ac - coupled) figure 9. lvpecl interface (dc - coupled) figure 10. lvpecl interface (a c- coupled) figure 11. lvds interface may 2014 11 05 1 514 - 4.0 tcg help@micrel.com or (408) 955 - 1690 downloaded from: http:///
micrel, inc. sy58606u cml output termination figure 12. cml dc- coupled termination figure 13. cml dc- coupled termination figure 14. cml ac- coupled termination may 2014 12 05 1 514 - 4.0 tcg help@micrel.com or (408) 955 - 1690 downloaded from: http:///
micrel, inc. sy58606u 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 the information furnished by micrel in this data sheet is believed to be accurate 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 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 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 signi ficant 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 use or sale. ? 2006 micrel, incorporated. may 2014 13 05 1 514 - 4.0 tcg help@micrel.com or (408) 955 - 1690 downloaded from: http:///

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