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SY58021U 4ghz, 1:4 lvpecl fanout buffer/translator with internal termination precision edge ? 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 SY58021U is a 2.5v/3.3v precision, high-speed, fully differential 1:4 lvpecl fanout buffer. optimized to provide four identical output copies with less than 15ps output skew and only 70 fs rms phase jitter, the SY58021U can process clock signals as fast as 4ghz. the differential input includes micrel?s unique, 3-pin input termination architecture interf aces to differential lvpecl, cml, and lvds signals (ac- or dc-coupled) as small as 100mv without any level-shifting or termination resistor networks in the signal path. for ac-coupled input interface applications, an on-board output reference voltage (v ref ac ) is provided to bias the vt pin. the outputs are 100k lvpecl compatible, with extremely fast rise/fall times guaranteed to 70fs. the SY58021U operates from a 2.5v 5% supply or 3.3v 10% supply and is guaranteed over the full industrial temperature range (?40c to +8 5c). for applications that require faster rise/fall times, or greater bandwidth, consider the sy58022u 1:4 fanout buffer with 400mv lvpecl output swing, or the sy58020u 1:4 cml fanout buffer. the SY58021U 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 . precision edge ? features ? precision 1:4 lvpecl fanout buffer ? low jitter performance: ? 70fs rms phase jitter (typical) ? accepts an input signal as low as 100mv ? unique input termination and vt pin accepts dc- coupled and ac-coupled diffe rential inputs: lvpecl, lvds, and cml ? 100k lvpecl-compatible 800mv swing output ? power supply 2.5v 5% and 3.3v 10% ? ? 40 c to + 85 c temperature range ? available in 16-pin (3mm 3mm) qfn package applications ? all sonet and gige clock distribution ? fibre channel clock and data distribution ? backplane distribution ? high-end, low-skew, multiprocessor, synchronous clock distribution block diagram september 2011 m9999-090111-b hbwhelp@micrel.com or (408) 955-1690
micrel, inc. SY58021U september 2011 2 m9999-090111-b hbwhelp@micrel.com \ ordering information (1) part number package type operating range package marking lead finish SY58021Umi qfn-16 industrial 021u sn-pb SY58021Umitr (2) qfn-16 industrial 021u sn-pb SY58021Umg (3) qfn-16 industrial 021u with pb-free bar-line indicator pb-free nipdau SY58021Umgtr (2, 3) qfn-16 industrial 021u with pb-free bar-line indicator pb-free nipdau notes: 1. contact factory for die availability. dice are guaranteed at t a = 25 c, dc electrical only. 2. tape and reel. 3. pb-free package recommended for new designs. pin configuration 16-pin qfn or (408) 955-1690
micrel, inc. SY58021U september 2011 3 m9999-090111-b hbwhelp@micrel.com or (408) 955-1690 pin description pin number pin name pin function 1, 4 in, /in differential input: this input pair receives the signal to be buffered. each pin of this pair internally terminates with 50 ? to the vt pin. note that this input will default to an indeterminate state if left open. see ?input interfac e applications? section. 2 vt input termination center-tap: each in put terminates to this pin. the v t pin provides a center-tap for each input (in, /in) to the termination networ k for maximum interface flexibility. see ?input interface applications? section. 3 vref-ac reference output voltage: this output biases to v cc ?1.2v. it is used when ac-coupling to differential inputs. connect v ref-ac directly to the vt pin. bypass with 0.01f low esr capacitor to v cc . see ?input interface applications? section. 8, 13 vcc positive power supply: bypass with 0.1f//0.01f low esr capacitors as close to the v cc pins as possible. 5, 16 gnd, exposed pad ground. exposed pad must be connected to a groun d plane that is the same potential as the ground pin. 14, 15, 11, 12, 9, 10, 6, 7 /q0, q0, /q1, q1, /q2, q2, /q3, q3 lvpecl differential output pairs: differential buffe red output copy of the input signal. the output swing is typically 800mv proper termination is 50 ? to v cc ?2v at the receiving end. unused output pairs may be left floating with no impact on jitter or skew. see ?lvpecl output termination? section.
micrel, inc. SY58021U september 2011 4 m9999-090111-b hbwhelp@micrel.com or (408) 955-1690 absolute maximum ratings (1) power supply voltage (v cc )......................... ? 0.5v to + 4.0v input voltage (v in ) ............................................ ? 0.5v to v cc lvpecl output current (i out ) continuous............................................................50ma surge ..................................................................100ma source or sink current on vt pin v t current ......................................................... 100ma source or sink current on in, /in input cu rrent....................................................... 50ma source or sink current on v ref-ac (4) v ref current....................................................... 1.5ma soldering (20s) ........................................................... 260 c storage temperature (t s ) ......................... ? 65c to + 150c operating ratings (2) power supply voltage (v cc ) .................. +2.375v to +3.60v operating temperature range (t a )............ ?40c to +85c package thermal resistance qfn ( ja ) still-air .......................................................+60 c/w 500 lpfm ....................................................+54 c/w qfn ( jb ) junction-to-board resistance (3) ................+33c/w input dc electrical characteristics (5) t a = ?40c to +85c. symbol parameter condition min. typ. max. units v cc = 2.5v 2.375 2.5 2.625 v cc power supply voltage v cc = 3.3v 3.0 3.3 3.60 v i cc power supply current no load, v cc = maximum 125 160 ma v ih input high voltage in, /in (note 6) v cc ? 1.6 v cc v v il input low voltage in, /in 0 v ih ? 0.1 v v in input voltage swing in, /in (see figure 1a) 0.1 1.7 v v diff_in differential input voltage swing in, /in (see figure 1b) 0.2 v r in in-to-v t resistance 40 50 60 v t_in in-to-v t voltage 1.28 v v ref-ac output reference voltage v cc ? 1.30 v cc ? 1.2 v cc ? 1.1 v notes: 1. permanent device damage may occur if ratings in the ?absolute maximum ratings? section are exceeded. this is a stress rating only and functional operation is not implied for condi tions other than those detailed in the operational sections of this data sheet. exposure to a bsolute maximum ratings conditions for extended peri ods may affect device reliability. 2. the data sheet limits are not guaranteed if t he device is operated beyond the operating ratings. 3. thermal performance assumes exposed pad is soldered (or equi valent) to the device?s most negative potential on the pcb. 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. 6. v ih (minimum) not lower than 1.2v.
micrel, inc. SY58021U september 2011 5 m9999-090111-b hbwhelp@micrel.com or (408) 955-1690 lvpecl output dc elec trical characteristics (5) v cc = 3.3v 10% or 2.5 5%; r l = 50 to v cc ? 2v; t a = ?40c to +85c, unless otherwise stated. symbol parameter condition min. typ. max. units v oh output high voltage v cc ? 1.145 v cc ? 0.895 v v ol output low voltage v cc ? 1.945 v cc ? 1.695 v v out output voltage differential s wing (see figure 1a) 550 780 1050 mv v diff_out differential output voltage swi ng (see figure 1b) 1100 1560 2100 mv ac electrical characteristics v cc = 2.5v 5% or 3.3 10%; r l = 50 to v cc ? 2v; t a = ?40c to +85c, unless otherwise stated. symbol parameter condition min. typ. max. units v out 400mv clock 4 ghz f max maximum operating frequency nrz data 5 gbps t pd propagation delay 150 220 300 ps t chan channel-to-channel skew note 7 4 15 ps t skew part-to-part skew note 8 50 ps t jitter rms phase jitter output: 622mhz integration range: 12khz ? 20mhz 70 fs t r , t f output rise/fall time (20% to 80%) at full swing 35 75 110 ps notes: 7. skew is measured between outputs of the same bank under identical transitions. 8. skew is defined for two parts with identical power supply volt ages at the same temperature and with no skew of the edges at the respective inputs.
micrel, inc. SY58021U september 2011 6 m9999-090111-b hbwhelp@micrel.com phase noise graph or (408) 955-1690
micrel, inc. SY58021U september 2011 7 m9999-090111-b hbwhelp@micrel.com timing diagram single-ended and di fferential swings figure 1a. single-ended voltage swing fi gure 1b. differential voltage swing or (408) 955-1690
micrel, inc. SY58021U september 2011 8 m9999-090111-b hbwhelp@micrel.com typical characteristics v cc = 2.5v, gnd = 0, v in = 100mv, t a = 25 c, unless otherwise stated. or (408) 955-1690
micrel, inc. SY58021U september 2011 9 m9999-090111-b hbwhelp@micrel.com functional characteristics v cc = 2.5v, gnd = 0, v in = 100mv, t a = 25 c, unless otherwise stated. input stage figure 2. simplified differential input buffer or (408) 955-1690
micrel, inc. SY58021U september 2011 10 m9999-090111-b hbwhelp@micrel.com input interface applications figure 3a. lvpecl input interface figure 3b. ac-coupled lvpecl input interface figure 3c. lvds input interface figure 3d. dc-coupled cml input interface figure 3e. ac-coupled cml input interface or (408) 955-1690
micrel, inc. SY58021U september 2011 11 m9999-090111-b hbwhelp@micrel.com lvpecl output lvpecl outputs have very-l ow output im pedance (open emitter), and small signal swing which results in low emi. lvpecl is ideal for driving 50 ? - and 100 ? -controlled impedance transmission lines. there are several techniques in terminating t he lvpecl output (figures 4 through 6). figure 4. parallel termination-thevenin equivalent figure 5. parallel termination (3-resistor) or (408) 955-1690
micrel, inc. SY58021U september 2011 12 m9999-090111-b hbwhelp@micrel.com figure 6. terminating unused i/o related micrel products a nd support documentation part number function data sheet link sy58020u 6ghz, 1:4 cml fanout buffer/translator with internal i/o terminations www.micrel.com/product-info/products/sy58020u.shtml SY58021U 4ghz, 1:4 lvpecl fanout buffer/translator with internal termination www.micrel.com/product-info /products/SY58021U.shmtl sy58022u 5.5ghz, 1:4 fanout buffer/translator with 400mv lvpecl outputs and internal terminations www.micrel.com/product-info/products/sy58022u.shtml m-0317 hbw solutions www.micrel.com/product-info/as/solutions.shtml or (408) 955-1690
micrel, inc. SY58021U september 2011 13 m9999-090111-b 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, fications and descriptions at any time without notice. no license, whether expre ss, implied, arising by estoppel or other wise, to any intellec 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 relati ng to the sale and/or use of micrel products i ncluding liability or arranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right speci tual w . 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 p r s ? 2005 micrel, incor roduct can reasonably be expected to result in personal injury. li fe support devices or systems are devices or systems that (a ) are intended fo urgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to resul t in a significant injury to the user. a purchaser?s use or sale of micrel products 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. p orated. or (408) 955-1690

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